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WM (Constants)
 
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Summary
WM_* Constants and their definitions or descriptions and what can cause them to be sent. Also is a list of constants for C# and VB.

For a C# enum see http://www.pinvoke.net/default.aspx/Enums/WindowsMessages.html

Definitions / Descriptions

WM_ACTIVATE &H6 The WM_ACTIVATE message is sent when a window is being activated or deactivated. This message is sent first to the window procedure of the top-level window being deactivated; it is then sent to the window procedure of the top-level window being activated.
WM_ACTIVATEAPP &H1C The WM_ACTIVATEAPP message is sent when a window belonging to a different application than the active window is about to be activated. The message is sent to the application whose window is being activated and to the application whose window is being deactivated.
WM_AFXFIRST &H360 Definition Needed
WM_AFXLAST &H37F Definition Needed
WM_APP &H8000 The WM_APP constant is used by applications to help define private messages, usually of the form WM_APP+X, where X is an integer value.
WM_ASKCBFORMATNAME &H30C The WM_ASKCBFORMATNAME message is sent to the clipboard owner by a clipboard viewer window to request the name of a CF_OWNERDISPLAY clipboard format.
WM_CANCELJOURNAL &H4B The WM_CANCELJOURNAL message is posted to an application when a user cancels the application's journaling activities. The message is posted with a NULL window handle.
WM_CANCELMODE &H1F The WM_CANCELMODE message is sent to cancel certain modes, such as mouse capture. For example, the system sends this message to the active window when a dialog box or message box is displayed. Certain functions also send this message explicitly to the specified window regardless of whether it is the active window. For example, the EnableWindow function sends this message when disabling the specified window.
WM_CAPTURECHANGED &H215 The WM_CAPTURECHANGED message is sent to the window that is losing the mouse capture.
WM_CHANGECBCHAIN &H30D The WM_CHANGECBCHAIN message is sent to the first window in the clipboard viewer chain when a window is being removed from the chain.
WM_CHANGEUISTATE &H127 An application sends the WM_CHANGEUISTATE message to indicate that the user interface (UI) state should be changed.
WM_CHAR &H102 The WM_CHAR message is posted to the window with the keyboard focus when a WM_KEYDOWN message is translated by the TranslateMessage function. The WM_CHAR message contains the character code of the key that was pressed.
WM_CHARTOITEM &H2F Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a WM_CHAR message.
WM_CHILDACTIVATE &H22 The WM_CHILDACTIVATE message is sent to a child window when the user clicks the window's title bar or when the window is activated, moved, or sized.
WM_CLEAR &H303 An application sends a WM_CLEAR message to an edit control or combo box to delete (clear) the current selection, if any, from the edit control.
WM_CLOSE &H10 The WM_CLOSE message is sent as a signal that a window or an application should terminate.
WM_COMMAND &H111 The WM_COMMAND message is sent when the user selects a command item from a menu, when a control sends a notification message to its parent window, or when an accelerator keystroke is translated.
WM_COMPACTING &H41 The WM_COMPACTING message is sent to all top-level windows when the system detects more than 12.5 percent of system time over a 30- to 60-second interval is being spent compacting memory. This indicates that system memory is low.
WM_COMPAREITEM &H39 The system sends the WM_COMPAREITEM message to determine the relative position of a new item in the sorted list of an owner-drawn combo box or list box. Whenever the application adds a new item, the system sends this message to the owner of a combo box or list box created with the CBS_SORT or LBS_SORT style.
WM_CONTEXTMENU &H7B The WM_CONTEXTMENU message notifies a window that the user clicked the right mouse button (right-clicked) in the window.
WM_COPY &H301 An application sends the WM_COPY message to an edit control or combo box to copy the current selection to the clipboard in CF_TEXT format.
WM_COPYDATA &H4A An application sends the WM_COPYDATA message to pass data to another application.
WM_CREATE &H1 The WM_CREATE message is sent when an application requests that a window be created by calling the CreateWindowEx or CreateWindow function. (The message is sent before the function returns.) The window procedure of the new window receives this message after the window is created, but before the window becomes visible.
WM_CTLCOLORBTN &H135 The WM_CTLCOLORBTN message is sent to the parent window of a button before drawing the button. The parent window can change the button's text and background colors. However, only owner-drawn buttons respond to the parent window processing this message.
WM_CTLCOLORDLG &H136 The WM_CTLCOLORDLG message is sent to a dialog box before the system draws the dialog box. By responding to this message, the dialog box can set its text and background colors using the specified display device context handle.
WM_CTLCOLOREDIT &H133 An edit control that is not read-only or disabled sends the WM_CTLCOLOREDIT message to its parent window when the control is about to be drawn. By responding to this message, the parent window can use the specified device context handle to set the text and background colors of the edit control.
WM_CTLCOLORLISTBOX &H134 Sent to the parent window of a list box before the system draws the list box. By responding to this message, the parent window can set the text and background colors of the list box by using the specified display device context handle.
WM_CTLCOLORMSGBOX &H132 The WM_CTLCOLORMSGBOX message is sent to the owner window of a message box before Windows draws the message box. By responding to this message, the owner window can set the text and background colors of the message box by using the given display device context handle.
WM_CTLCOLORSCROLLBAR &H137 The WM_CTLCOLORSCROLLBAR message is sent to the parent window of a scroll bar control when the control is about to be drawn. By responding to this message, the parent window can use the display context handle to set the background color of the scroll bar control.
WM_CTLCOLORSTATIC &H138 A static control, or an edit control that is read-only or disabled, sends the WM_CTLCOLORSTATIC message to its parent window when the control is about to be drawn. By responding to this message, the parent window can use the specified device context handle to set the text and background colors of the static control.
WM_CUT &H300 An application sends a WM_CUT message to an edit control or combo box to delete (cut) the current selection, if any, in the edit control and copy the deleted text to the clipboard in CF_TEXT format.
WM_DEADCHAR &H103 The WM_DEADCHAR message is posted to the window with the keyboard focus when a WM_KEYUP message is translated by the TranslateMessage function. WM_DEADCHAR specifies a character code generated by a dead key. A dead key is a key that generates a character, such as the umlaut (double-dot), that is combined with another character to form a composite character. For example, the umlaut-O character (Ö) is generated by typing the dead key for the umlaut character, and then typing the O key.
WM_DELETEITEM &H2D Sent to the owner of a list box or combo box when the list box or combo box is destroyed or when items are removed by the LB_DELETESTRING, LB_RESETCONTENT, CB_DELETESTRING, or CB_RESETCONTENT message. The system sends a WM_DELETEITEM message for each deleted item. The system sends the WM_DELETEITEM message for any deleted list box or combo box item with nonzero item data.
WM_DESTROY &H2 The WM_DESTROY message is sent when a window is being destroyed. It is sent to the window procedure of the window being destroyed after the window is removed from the screen. This message is sent first to the window being destroyed and then to the child windows (if any) as they are destroyed. During the processing of the message, it can be assumed that all child windows still exist.
WM_DESTROYCLIPBOARD &H307 The WM_DESTROYCLIPBOARD message is sent to the clipboard owner when a call to the EmptyClipboard function empties the clipboard.
WM_DEVICECHANGE &H219 Notifies an application of a change to the hardware configuration of a device or the computer.
WM_DEVMODECHANGE &H1B The WM_DEVMODECHANGE message is sent to all top-level windows whenever the user changes device-mode settings.
WM_DISPLAYCHANGE &H7E The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.
WM_DRAWCLIPBOARD &H308 The WM_DRAWCLIPBOARD message is sent to the first window in the clipboard viewer chain when the content of the clipboard changes. This enables a clipboard viewer window to display the new content of the clipboard.
WM_DRAWITEM &H2B The WM_DRAWITEM message is sent to the parent window of an owner-drawn button, combo box, list box, or menu when a visual aspect of the button, combo box, list box, or menu has changed.
WM_DROPFILES &H233 Sent when the user drops a file on the window of an application that has registered itself as a recipient of dropped files.
WM_ENABLE &HA The WM_ENABLE message is sent when an application changes the enabled state of a window. It is sent to the window whose enabled state is changing. This message is sent before the EnableWindow function returns, but after the enabled state (WS_DISABLED style bit) of the window has changed.
WM_ENDSESSION &H16 The WM_ENDSESSION message is sent to an application after the system processes the results of the WM_QUERYENDSESSION message. The WM_ENDSESSION message informs the application whether the session is ending.
WM_ENTERIDLE &H121 The WM_ENTERIDLE message is sent to the owner window of a modal dialog box or menu that is entering an idle state. A modal dialog box or menu enters an idle state when no messages are waiting in its queue after it has processed one or more previous messages.
WM_ENTERMENULOOP &H211 The WM_ENTERMENULOOP message informs an application's main window procedure that a menu modal loop has been entered.
WM_ENTERSIZEMOVE &H231 The WM_ENTERSIZEMOVE message is sent one time to a window after it enters the moving or sizing modal loop. The window enters the moving or sizing modal loop when the user clicks the window's title bar or sizing border, or when the window passes the WM_SYSCOMMAND message to the DefWindowProc function and the wParam parameter of the message specifies the SC_MOVE or SC_SIZE value. The operation is complete when DefWindowProc returns.
WM_ERASEBKGND &H14 The WM_ERASEBKGND message is sent when the window background must be erased (for example, when a window is resized). The message is sent to prepare an invalidated portion of a window for painting.
WM_EXITMENULOOP &H212 The WM_EXITMENULOOP message informs an application's main window procedure that a menu modal loop has been exited.
WM_EXITSIZEMOVE &H232 The WM_EXITSIZEMOVE message is sent one time to a window, after it has exited the moving or sizing modal loop. The window enters the moving or sizing modal loop when the user clicks the window's title bar or sizing border, or when the window passes the WM_SYSCOMMAND message to the DefWindowProc function and the wParam parameter of the message specifies the SC_MOVE or SC_SIZE value. The operation is complete when DefWindowProc returns.
WM_FONTCHANGE &H1D An application sends the WM_FONTCHANGE message to all top-level windows in the system after changing the pool of font resources.
WM_GETDLGCODE &H87 The WM_GETDLGCODE message is sent to the window procedure associated with a control. By default, the system handles all keyboard input to the control; the system interprets certain types of keyboard input as dialog box navigation keys. To override this default behavior, the control can respond to the WM_GETDLGCODE message to indicate the types of input it wants to process itself.
WM_GETFONT &H31 An application sends a WM_GETFONT message to a control to retrieve the font with which the control is currently drawing its text.
WM_GETHOTKEY &H33 An application sends a WM_GETHOTKEY message to determine the hot key associated with a window.
WM_GETICON &H7F The WM_GETICON message is sent to a window to retrieve a handle to the large or small icon associated with a window. The system displays the large icon in the ALT+TAB dialog, and the small icon in the window caption.
WM_GETMINMAXINFO &H24 The WM_GETMINMAXINFO message is sent to a window when the size or position of the window is about to change. An application can use this message to override the window's default maximized size and position, or its default minimum or maximum tracking size.
WM_GETOBJECT &H3D Active Accessibility sends the WM_GETOBJECT message to obtain information about an accessible object contained in a server application. Applications never send this message directly. It is sent only by Active Accessibility in response to calls to AccessibleObjectFromPoint, AccessibleObjectFromEvent, or AccessibleObjectFromWindow. However, server applications handle this message.
WM_GETTEXT &HD An application sends a WM_GETTEXT message to copy the text that corresponds to a window into a buffer provided by the caller.
WM_GETTEXTLENGTH &HE An application sends a WM_GETTEXTLENGTH message to determine the length, in characters, of the text associated with a window.
WM_HANDHELDFIRST &H358 Definition Needed
WM_HANDHELDLAST &H35F Definition Needed
WM_HELP &H53 Indicates that the user pressed the F1 key. If a menu is active when F1 is pressed, WM_HELP is sent to the window associated with the menu; otherwise, WM_HELP is sent to the window that has the keyboard focus. If no window has the keyboard focus, WM_HELP is sent to the currently active window.
WM_HOTKEY &H312 The WM_HOTKEY message is posted when the user presses a hot key registered by the RegisterHotKey function. The message is placed at the top of the message queue associated with the thread that registered the hot key.
WM_HSCROLL &H114 This message is sent to a window when a scroll event occurs in the window's standard horizontal scroll bar. This message is also sent to the owner of a horizontal scroll bar control when a scroll event occurs in the control.
WM_HSCROLLCLIPBOARD &H30E The WM_HSCROLLCLIPBOARD message is sent to the clipboard owner by a clipboard viewer window. This occurs when the clipboard contains data in the CF_OWNERDISPLAY format and an event occurs in the clipboard viewer's horizontal scroll bar. The owner should scroll the clipboard image and update the scroll bar values.
WM_ICONERASEBKGND &H27 Windows NT 3.51 and earlier: The WM_ICONERASEBKGND message is sent to a minimized window when the background of the icon must be filled before painting the icon. A window receives this message only if a class icon is defined for the window; otherwise, WM_ERASEBKGND is sent. This message is not sent by newer versions of Windows.
WM_IME_CHAR &H286 Sent to an application when the IME gets a character of the conversion result. A window receives this message through its WindowProc function.
WM_IME_COMPOSITION &H10F Sent to an application when the IME changes composition status as a result of a keystroke. A window receives this message through its WindowProc function.
WM_IME_COMPOSITIONFULL &H284 Sent to an application when the IME window finds no space to extend the area for the composition window. A window receives this message through its WindowProc function.
WM_IME_CONTROL &H283 Sent by an application to direct the IME window to carry out the requested command. The application uses this message to control the IME window that it has created. To send this message, the application calls the SendMessage function with the following parameters.
WM_IME_ENDCOMPOSITION &H10E Sent to an application when the IME ends composition. A window receives this message through its WindowProc function.
WM_IME_KEYDOWN &H290 Sent to an application by the IME to notify the application of a key press and to keep message order. A window receives this message through its WindowProc function.
WM_IME_KEYLAST &H10F Definition Needed
WM_IME_KEYUP &H291 Sent to an application by the IME to notify the application of a key release and to keep message order. A window receives this message through its WindowProc function.
WM_IME_NOTIFY &H282 Sent to an application to notify it of changes to the IME window. A window receives this message through its WindowProc function.
WM_IME_REQUEST &H288 Sent to an application to provide commands and request information. A window receives this message through its WindowProc function.
WM_IME_SELECT &H285 Sent to an application when the operating system is about to change the current IME. A window receives this message through its WindowProc function.
WM_IME_SETCONTEXT &H281 Sent to an application when a window is activated. A window receives this message through its WindowProc function.
WM_IME_STARTCOMPOSITION &H10D Sent immediately before the IME generates the composition string as a result of a keystroke. A window receives this message through its WindowProc function.
WM_INITDIALOG &H110 The WM_INITDIALOG message is sent to the dialog box procedure immediately before a dialog box is displayed. Dialog box procedures typically use this message to initialize controls and carry out any other initialization tasks that affect the appearance of the dialog box.
WM_INITMENU &H116 The WM_INITMENU message is sent when a menu is about to become active. It occurs when the user clicks an item on the menu bar or presses a menu key. This allows the application to modify the menu before it is displayed.
WM_INITMENUPOPUP &H117 The WM_INITMENUPOPUP message is sent when a drop-down menu or submenu is about to become active. This allows an application to modify the menu before it is displayed, without changing the entire menu.
WM_INPUTLANGCHANGE &H51 The WM_INPUTLANGCHANGE message is sent to the topmost affected window after an application's input language has been changed. You should make any application-specific settings and pass the message to the DefWindowProc function, which passes the message to all first-level child windows. These child windows can pass the message to DefWindowProc to have it pass the message to their child windows, and so on.
WM_INPUTLANGCHANGEREQUEST &H50 The WM_INPUTLANGCHANGEREQUEST message is posted to the window with the focus when the user chooses a new input language, either with the hotkey (specified in the Keyboard control panel application) or from the indicator on the system taskbar. An application can accept the change by passing the message to the DefWindowProc function or reject the change (and prevent it from taking place) by returning immediately.
WM_KEYDOWN &H100 The WM_KEYDOWN message is posted to the window with the keyboard focus when a nonsystem key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed.
WM_KEYFIRST &H100 This message filters for keyboard messages.
WM_KEYLAST &H108 This message filters for keyboard messages.
WM_KEYUP &H101 The WM_KEYUP message is posted to the window with the keyboard focus when a nonsystem key is released. A nonsystem key is a key that is pressed when the ALT key is not pressed, or a keyboard key that is pressed when a window has the keyboard focus.
WM_KILLFOCUS &H8 The WM_KILLFOCUS message is sent to a window immediately before it loses the keyboard focus.
WM_LBUTTONDBLCLK &H203 The WM_LBUTTONDBLCLK message is posted when the user double-clicks the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_LBUTTONDOWN &H201 The WM_LBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_LBUTTONUP &H202 The WM_LBUTTONUP message is posted when the user releases the left mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_MBUTTONDBLCLK &H209 The WM_MBUTTONDBLCLK message is posted when the user double-clicks the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_MBUTTONDOWN &H207 The WM_MBUTTONDOWN message is posted when the user presses the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_MBUTTONUP &H208 The WM_MBUTTONUP message is posted when the user releases the middle mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_MDIACTIVATE &H222 An application sends the WM_MDIACTIVATE message to a multiple-document interface (MDI) client window to instruct the client window to activate a different MDI child window.
WM_MDICASCADE &H227 An application sends the WM_MDICASCADE message to a multiple-document interface (MDI) client window to arrange all its child windows in a cascade format.
WM_MDICREATE &H220 An application sends the WM_MDICREATE message to a multiple-document interface (MDI) client window to create an MDI child window.
WM_MDIDESTROY &H221 An application sends the WM_MDIDESTROY message to a multiple-document interface (MDI) client window to close an MDI child window.
WM_MDIGETACTIVE &H229 An application sends the WM_MDIGETACTIVE message to a multiple-document interface (MDI) client window to retrieve the handle to the active MDI child window.
WM_MDIICONARRANGE &H228 An application sends the WM_MDIICONARRANGE message to a multiple-document interface (MDI) client window to arrange all minimized MDI child windows. It does not affect child windows that are not minimized.
WM_MDIMAXIMIZE &H225 An application sends the WM_MDIMAXIMIZE message to a multiple-document interface (MDI) client window to maximize an MDI child window. The system resizes the child window to make its client area fill the client window. The system places the child window's window menu icon in the rightmost position of the frame window's menu bar, and places the child window's restore icon in the leftmost position. The system also appends the title bar text of the child window to that of the frame window.
WM_MDINEXT &H224 An application sends the WM_MDINEXT message to a multiple-document interface (MDI) client window to activate the next or previous child window.
WM_MDIREFRESHMENU &H234 An application sends the WM_MDIREFRESHMENU message to a multiple-document interface (MDI) client window to refresh the window menu of the MDI frame window.
WM_MDIRESTORE &H223 An application sends the WM_MDIRESTORE message to a multiple-document interface (MDI) client window to restore an MDI child window from maximized or minimized size.
WM_MDISETMENU &H230 An application sends the WM_MDISETMENU message to a multiple-document interface (MDI) client window to replace the entire menu of an MDI frame window, to replace the window menu of the frame window, or both.
WM_MDITILE &H226 An application sends the WM_MDITILE message to a multiple-document interface (MDI) client window to arrange all of its MDI child windows in a tile format.
WM_MEASUREITEM &H2C The WM_MEASUREITEM message is sent to the owner window of a combo box, list box, list view control, or menu item when the control or menu is created.
WM_MENUCHAR &H120 The WM_MENUCHAR message is sent when a menu is active and the user presses a key that does not correspond to any mnemonic or accelerator key. This message is sent to the window that owns the menu.
WM_MENUCOMMAND &H126 The WM_MENUCOMMAND message is sent when the user makes a selection from a menu.
WM_MENUDRAG &H123 The WM_MENUDRAG message is sent to the owner of a drag-and-drop menu when the user drags a menu item.
WM_MENUGETOBJECT &H124 The WM_MENUGETOBJECT message is sent to the owner of a drag-and-drop menu when the mouse cursor enters a menu item or moves from the center of the item to the top or bottom of the item.
WM_MENURBUTTONUP &H122 The WM_MENURBUTTONUP message is sent when the user releases the right mouse button while the cursor is on a menu item.
WM_MENUSELECT &H11F The WM_MENUSELECT message is sent to a menu's owner window when the user selects a menu item.
WM_MOUSEACTIVATE &H21 The WM_MOUSEACTIVATE message is sent when the cursor is in an inactive window and the user presses a mouse button. The parent window receives this message only if the child window passes it to the DefWindowProc function.
WM_MOUSEFIRST &H200 Use WM_MOUSEFIRST to specify the first mouse message. Use the PeekMessage() Function.
WM_MOUSEHOVER &H2A1 The WM_MOUSEHOVER message is posted to a window when the cursor hovers over the client area of the window for the period of time specified in a prior call to TrackMouseEvent.
WM_MOUSELAST &H20D Definition Needed
WM_MOUSELEAVE &H2A3 The WM_MOUSELEAVE message is posted to a window when the cursor leaves the client area of the window specified in a prior call to TrackMouseEvent.
WM_MOUSEMOVE &H200 The WM_MOUSEMOVE message is posted to a window when the cursor moves. If the mouse is not captured, the message is posted to the window that contains the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_MOUSEWHEEL &H20A The WM_MOUSEWHEEL message is sent to the focus window when the mouse wheel is rotated. The DefWindowProc function propagates the message to the window's parent. There should be no internal forwarding of the message, since DefWindowProc propagates it up the parent chain until it finds a window that processes it.
WM_MOUSEHWHEEL &H20E The WM_MOUSEHWHEEL message is sent to the focus window when the mouse's horizontal scroll wheel is tilted or rotated. The DefWindowProc function propagates the message to the window's parent. There should be no internal forwarding of the message, since DefWindowProc propagates it up the parent chain until it finds a window that processes it.
WM_MOVE &H3 The WM_MOVE message is sent after a window has been moved.
WM_MOVING &H216 The WM_MOVING message is sent to a window that the user is moving. By processing this message, an application can monitor the position of the drag rectangle and, if needed, change its position.
WM_NCACTIVATE &H86 Non Client Area Activated Caption(Title) of the Form
WM_NCCALCSIZE &H83 The WM_NCCALCSIZE message is sent when the size and position of a window's client area must be calculated. By processing this message, an application can control the content of the window's client area when the size or position of the window changes.
WM_NCCREATE &H81 The WM_NCCREATE message is sent prior to the WM_CREATE message when a window is first created.
WM_NCDESTROY &H82 The WM_NCDESTROY message informs a window that its nonclient area is being destroyed. The DestroyWindow function sends the WM_NCDESTROY message to the window following the WM_DESTROY message. WM_DESTROY is used to free the allocated memory object associated with the window.
WM_NCHITTEST &H84 The WM_NCHITTEST message is sent to a window when the cursor moves, or when a mouse button is pressed or released. If the mouse is not captured, the message is sent to the window beneath the cursor. Otherwise, the message is sent to the window that has captured the mouse.
WM_NCLBUTTONDBLCLK &HA3 The WM_NCLBUTTONDBLCLK message is posted when the user double-clicks the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCLBUTTONDOWN &HA1 The WM_NCLBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCLBUTTONUP &HA2 The WM_NCLBUTTONUP message is posted when the user releases the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCMBUTTONDBLCLK &HA9 The WM_NCMBUTTONDBLCLK message is posted when the user double-clicks the middle mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCMBUTTONDOWN &HA7 The WM_NCMBUTTONDOWN message is posted when the user presses the middle mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCMBUTTONUP &HA8 The WM_NCMBUTTONUP message is posted when the user releases the middle mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCMOUSEMOVE &HA0 The WM_NCMOUSEMOVE message is posted to a window when the cursor is moved within the nonclient area of the window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCPAINT &H85 The WM_NCPAINT message is sent to a window when its frame must be painted.
WM_NCRBUTTONDBLCLK &HA6 The WM_NCRBUTTONDBLCLK message is posted when the user double-clicks the right mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCRBUTTONDOWN &HA4 The WM_NCRBUTTONDOWN message is posted when the user presses the right mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCRBUTTONUP &HA5 The WM_NCRBUTTONUP message is posted when the user releases the right mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NEXTDLGCTL &H28 The WM_NEXTDLGCTL message is sent to a dialog box procedure to set the keyboard focus to a different control in the dialog box
WM_NEXTMENU &H213 The WM_NEXTMENU message is sent to an application when the right or left arrow key is used to switch between the menu bar and the system menu.
WM_NOTIFY &H4E Sent by a common control to its parent window when an event has occurred or the control requires some information.
WM_NOTIFYFORMAT &H55 Determines if a window accepts ANSI or Unicode structures in the WM_NOTIFY notification message. WM_NOTIFYFORMAT messages are sent from a common control to its parent window and from the parent window to the common control.
WM_NULL &H0 The WM_NULL message performs no operation. An application sends the WM_NULL message if it wants to post a message that the recipient window will ignore.
WM_PAINT &HF Occurs when the control needs repainting
WM_PAINTCLIPBOARD &H309 The WM_PAINTCLIPBOARD message is sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard viewer's client area needs repainting.
WM_PAINTICON &H26 Windows NT 3.51 and earlier: The WM_PAINTICON message is sent to a minimized window when the icon is to be painted. This message is not sent by newer versions of Microsoft Windows, except in unusual circumstances explained in the Remarks.
WM_PALETTECHANGED &H311 This message is sent by the OS to all top-level and overlapped windows after the window with the keyboard focus realizes its logical palette. This message enables windows that do not have the keyboard focus to realize their logical palettes and update their client areas.
WM_PALETTEISCHANGING &H310 The WM_PALETTEISCHANGING message informs applications that an application is going to realize its logical palette.
WM_PARENTNOTIFY &H210 The WM_PARENTNOTIFY message is sent to the parent of a child window when the child window is created or destroyed, or when the user clicks a mouse button while the cursor is over the child window. When the child window is being created, the system sends WM_PARENTNOTIFY just before the CreateWindow or CreateWindowEx function that creates the window returns. When the child window is being destroyed, the system sends the message before any processing to destroy the window takes place.
WM_PASTE &H302 An application sends a WM_PASTE message to an edit control or combo box to copy the current content of the clipboard to the edit control at the current caret position. Data is inserted only if the clipboard contains data in CF_TEXT format.
WM_PENWINFIRST &H380 Definition Needed
WM_PENWINLAST &H38F Definition Needed
WM_POWER &H48 Notifies applications that the system, typically a battery-powered personal computer, is about to enter a suspended mode. Obsolete : use POWERBROADCAST instead
WM_POWERBROADCAST &H218 Notifies applications that a power-management event has occurred.
WM_PRINT &H317 The WM_PRINT message is sent to a window to request that it draw itself in the specified device context, most commonly in a printer device context.
WM_PRINTCLIENT &H318 The WM_PRINTCLIENT message is sent to a window to request that it draw its client area in the specified device context, most commonly in a printer device context.
WM_QUERYDRAGICON &H37 The WM_QUERYDRAGICON message is sent to a minimized (iconic) window. The window is about to be dragged by the user but does not have an icon defined for its class. An application can return a handle to an icon or cursor. The system displays this cursor or icon while the user drags the icon.
WM_QUERYENDSESSION &H11 The WM_QUERYENDSESSION message is sent when the user chooses to end the session or when an application calls one of the system shutdown functions. If any application returns zero, the session is not ended. The system stops sending WM_QUERYENDSESSION messages as soon as one application returns zero. After processing this message, the system sends the WM_ENDSESSION message with the wParam parameter set to the results of the WM_QUERYENDSESSION message.
WM_QUERYNEWPALETTE &H30F This message informs a window that it is about to receive the keyboard focus, giving the window the opportunity to realize its logical palette when it receives the focus.
WM_QUERYOPEN &H13 The WM_QUERYOPEN message is sent to an icon when the user requests that the window be restored to its previous size and position.
WM_QUEUESYNC &H23 The WM_QUEUESYNC message is sent by a computer-based training (CBT) application to separate user-input messages from other messages sent through the WH_JOURNALPLAYBACK Hook procedure.
WM_QUIT &H12 Once received, it ends the application's Message Loop, signaling the application to end. It can be sent by pressing Alt+F4, Clicking the X in the upper right-hand of the program, or going to File->Exit.
WM_RBUTTONDBLCLK &H206 he WM_RBUTTONDBLCLK message is posted when the user double-clicks the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_RBUTTONDOWN &H204 The WM_RBUTTONDOWN message is posted when the user presses the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_RBUTTONUP &H205 The WM_RBUTTONUP message is posted when the user releases the right mouse button while the cursor is in the client area of a window. If the mouse is not captured, the message is posted to the window beneath the cursor. Otherwise, the message is posted to the window that has captured the mouse.
WM_RENDERALLFORMATS &H306 The WM_RENDERALLFORMATS message is sent to the clipboard owner before it is destroyed, if the clipboard owner has delayed rendering one or more clipboard formats. For the content of the clipboard to remain available to other applications, the clipboard owner must render data in all the formats it is capable of generating, and place the data on the clipboard by calling the SetClipboardData function.
WM_RENDERFORMAT &H305 The WM_RENDERFORMAT message is sent to the clipboard owner if it has delayed rendering a specific clipboard format and if an application has requested data in that format. The clipboard owner must render data in the specified format and place it on the clipboard by calling the SetClipboardData function.
WM_SETCURSOR &H20 The WM_SETCURSOR message is sent to a window if the mouse causes the cursor to move within a window and mouse input is not captured.
WM_SETFOCUS &H7 When the controll got the focus
WM_SETFONT &H30 An application sends a WM_SETFONT message to specify the font that a control is to use when drawing text.
WM_SETHOTKEY &H32 An application sends a WM_SETHOTKEY message to a window to associate a hot key with the window. When the user presses the hot key, the system activates the window.
WM_SETICON &H80 An application sends the WM_SETICON message to associate a new large or small icon with a window. The system displays the large icon in the ALT+TAB dialog box, and the small icon in the window caption.
WM_SETREDRAW &HB An application sends the WM_SETREDRAW message to a window to allow changes in that window to be redrawn or to prevent changes in that window from being redrawn.
WM_SETTEXT &HC Text / Caption changed on the control. An application sends a WM_SETTEXT message to set the text of a window.
WM_SETTINGCHANGE &H1A An application sends the WM_SETTINGCHANGE message to all top-level windows after making a change to the WIN.INI file. The SystemParametersInfo function sends this message after an application uses the function to change a setting in WIN.INI.
WM_SHOWWINDOW &H18 The WM_SHOWWINDOW message is sent to a window when the window is about to be hidden or shown
WM_SIZE &H5 The WM_SIZE message is sent to a window after its size has changed.
WM_SIZECLIPBOARD &H30B The WM_SIZECLIPBOARD message is sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and the clipboard viewer's client area has changed size.
WM_SIZING &H214 The WM_SIZING message is sent to a window that the user is resizing. By processing this message, an application can monitor the size and position of the drag rectangle and, if needed, change its size or position.
WM_SPOOLERSTATUS &H2A The WM_SPOOLERSTATUS message is sent from Print Manager whenever a job is added to or removed from the Print Manager queue.
WM_STYLECHANGED &H7D The WM_STYLECHANGED message is sent to a window after the SetWindowLong function has changed one or more of the window's styles.
WM_STYLECHANGING &H7C The WM_STYLECHANGING message is sent to a window when the SetWindowLong function is about to change one or more of the window's styles.
WM_SYNCPAINT &H88 The WM_SYNCPAINT message is used to synchronize painting while avoiding linking independent GUI threads.
WM_SYSCHAR &H106 The WM_SYSCHAR message is posted to the window with the keyboard focus when a WM_SYSKEYDOWN message is translated by the TranslateMessage function. It specifies the character code of a system character key — that is, a character key that is pressed while the ALT key is down.
WM_SYSCOLORCHANGE &H15 This message is sent to all top-level windows when a change is made to a system color setting.
WM_SYSCOMMAND &H112 A window receives this message when the user chooses a command from the Window menu (formerly known as the system or control menu) or when the user chooses the maximize button, minimize button, restore button, or close button.
WM_SYSDEADCHAR &H107 The WM_SYSDEADCHAR message is sent to the window with the keyboard focus when a WM_SYSKEYDOWN message is translated by the TranslateMessage function. WM_SYSDEADCHAR specifies the character code of a system dead key — that is, a dead key that is pressed while holding down the ALT key.
WM_SYSKEYDOWN &H104 The WM_SYSKEYDOWN message is posted to the window with the keyboard focus when the user presses the F10 key (which activates the menu bar) or holds down the ALT key and then presses another key. It also occurs when no window currently has the keyboard focus; in this case, the WM_SYSKEYDOWN message is sent to the active window. The window that receives the message can distinguish between these two contexts by checking the context code in the lParam parameter.
WM_SYSKEYUP &H105 The WM_SYSKEYUP message is posted to the window with the keyboard focus when the user releases a key that was pressed while the ALT key was held down. It also occurs when no window currently has the keyboard focus; in this case, the WM_SYSKEYUP message is sent to the active window. The window that receives the message can distinguish between these two contexts by checking the context code in the lParam parameter.
WM_TCARD &H52 Sent to an application that has initiated a training card with Microsoft Windows Help. The message informs the application when the user clicks an authorable button. An application initiates a training card by specifying the HELP_TCARD command in a call to the WinHelp function.
WM_TIMECHANGE &H1E A message that is sent whenever there is a change in the system time.
WM_TIMER &H113 The WM_TIMER message is posted to the installing thread's message queue when a timer expires. The message is posted by the GetMessage or PeekMessage function.
WM_UNDO &H304 An application sends a WM_UNDO message to an edit control to undo the last operation. When this message is sent to an edit control, the previously deleted text is restored or the previously added text is deleted.
WM_UNINITMENUPOPUP &H125 The WM_UNINITMENUPOPUP message is sent when a drop-down menu or submenu has been destroyed.
WM_USER &H400 The WM_USER constant is used by applications to help define private messages for use by private window classes, usually of the form WM_USER+X, where X is an integer value.
WM_USERCHANGED &H54 The WM_USERCHANGED message is sent to all windows after the user has logged on or off. When the user logs on or off, the system updates the user-specific settings. The system sends this message immediately after updating the settings.
WM_VKEYTOITEM &H2E Sent by a list box with the LBS_WANTKEYBOARDINPUT style to its owner in response to a WM_KEYDOWN message.
WM_VSCROLL &H115 The WM_VSCROLL message is sent to a window when a scroll event occurs in the window's standard vertical scroll bar. This message is also sent to the owner of a vertical scroll bar control when a scroll event occurs in the control.
WM_VSCROLLCLIPBOARD &H30A The WM_VSCROLLCLIPBOARD message is sent to the clipboard owner by a clipboard viewer window when the clipboard contains data in the CF_OWNERDISPLAY format and an event occurs in the clipboard viewer's vertical scroll bar. The owner should scroll the clipboard image and update the scroll bar values.
WM_WINDOWPOSCHANGED &H47 The WM_WINDOWPOSCHANGED message is sent to a window whose size, position, or place in the Z order has changed as a result of a call to the SetWindowPos function or another window-management function.
WM_WINDOWPOSCHANGING &H46 The WM_WINDOWPOSCHANGING message is sent to a window whose size, position, or place in the Z order is about to change as a result of a call to the SetWindowPos function or another window-management function.
WM_WININICHANGE &H1A An application sends the WM_WININICHANGE message to all top-level windows after making a change to the WIN.INI file. The SystemParametersInfo function sends this message after an application uses the function to change a setting in WIN.INI. Note The WM_WININICHANGE message is provided only for compatibility with earlier versions of the system. Applications should use the WM_SETTINGCHANGE message.
WM_XBUTTONDBLCLK &H20D Definition Needed
WM_XBUTTONDOWN &H20B Definition Needed
WM_XBUTTONUP &H20C Definition Needed

C# Constants:

private const UInt32 WM_ACTIVATE           = 0x0006;
private const UInt32 WM_ACTIVATEAPP        = 0x001C;
private const UInt32 WM_AFXFIRST           = 0x0360;
private const UInt32 WM_AFXLAST        = 0x037F;
private const UInt32 WM_APP            = 0x8000;
private const UInt32 WM_ASKCBFORMATNAME    = 0x030C;
private const UInt32 WM_CANCELJOURNAL      = 0x004B;
private const UInt32 WM_CANCELMODE         = 0x001F;
private const UInt32 WM_CAPTURECHANGED     = 0x0215;
private const UInt32 WM_CHANGECBCHAIN      = 0x030D;
private const UInt32 WM_CHANGEUISTATE      = 0x0127;
private const UInt32 WM_CHAR           = 0x0102;
private const UInt32 WM_CHARTOITEM         = 0x002F;
private const UInt32 WM_CHILDACTIVATE      = 0x0022;
private const UInt32 WM_CLEAR          = 0x0303;
private const UInt32 WM_CLOSE          = 0x0010;
private const UInt32 WM_COMMAND        = 0x0111;
private const UInt32 WM_COMPACTING         = 0x0041;
private const UInt32 WM_COMPAREITEM        = 0x0039;
private const UInt32 WM_CONTEXTMENU        = 0x007B;
private const UInt32 WM_COPY           = 0x0301;
private const UInt32 WM_COPYDATA           = 0x004A;
private const UInt32 WM_CREATE         = 0x0001;
private const UInt32 WM_CTLCOLORBTN        = 0x0135;
private const UInt32 WM_CTLCOLORDLG        = 0x0136;
private const UInt32 WM_CTLCOLOREDIT       = 0x0133;
private const UInt32 WM_CTLCOLORLISTBOX    = 0x0134;
private const UInt32 WM_CTLCOLORMSGBOX     = 0x0132;
private const UInt32 WM_CTLCOLORSCROLLBAR      = 0x0137;
private const UInt32 WM_CTLCOLORSTATIC     = 0x0138;
private const UInt32 WM_CUT            = 0x0300;
private const UInt32 WM_DEADCHAR           = 0x0103;
private const UInt32 WM_DELETEITEM         = 0x002D;
private const UInt32 WM_DESTROY        = 0x0002;
private const UInt32 WM_DESTROYCLIPBOARD       = 0x0307;
private const UInt32 WM_DEVICECHANGE       = 0x0219;
private const UInt32 WM_DEVMODECHANGE      = 0x001B;
private const UInt32 WM_DISPLAYCHANGE      = 0x007E;
private const UInt32 WM_DRAWCLIPBOARD      = 0x0308;
private const UInt32 WM_DRAWITEM           = 0x002B;
private const UInt32 WM_DROPFILES          = 0x0233;
private const UInt32 WM_ENABLE         = 0x000A;
private const UInt32 WM_ENDSESSION         = 0x0016;
private const UInt32 WM_ENTERIDLE          = 0x0121;
private const UInt32 WM_ENTERMENULOOP      = 0x0211;
private const UInt32 WM_ENTERSIZEMOVE      = 0x0231;
private const UInt32 WM_ERASEBKGND         = 0x0014;
private const UInt32 WM_EXITMENULOOP       = 0x0212;
private const UInt32 WM_EXITSIZEMOVE       = 0x0232;
private const UInt32 WM_FONTCHANGE         = 0x001D;
private const UInt32 WM_GETDLGCODE         = 0x0087;
private const UInt32 WM_GETFONT        = 0x0031;
private const UInt32 WM_GETHOTKEY          = 0x0033;
private const UInt32 WM_GETICON        = 0x007F;
private const UInt32 WM_GETMINMAXINFO      = 0x0024;
private const UInt32 WM_GETOBJECT          = 0x003D;
private const UInt32 WM_GETTEXT        = 0x000D;
private const UInt32 WM_GETTEXTLENGTH      = 0x000E;
private const UInt32 WM_HANDHELDFIRST      = 0x0358;
private const UInt32 WM_HANDHELDLAST       = 0x035F;
private const UInt32 WM_HELP           = 0x0053;
private const UInt32 WM_HOTKEY         = 0x0312;
private const UInt32 WM_HSCROLL        = 0x0114;
private const UInt32 WM_HSCROLLCLIPBOARD       = 0x030E;
private const UInt32 WM_ICONERASEBKGND     = 0x0027;
private const UInt32 WM_IME_CHAR           = 0x0286;
private const UInt32 WM_IME_COMPOSITION    = 0x010F;
private const UInt32 WM_IME_COMPOSITIONFULL    = 0x0284;
private const UInt32 WM_IME_CONTROL        = 0x0283;
private const UInt32 WM_IME_ENDCOMPOSITION     = 0x010E;
private const UInt32 WM_IME_KEYDOWN        = 0x0290;
private const UInt32 WM_IME_KEYLAST        = 0x010F;
private const UInt32 WM_IME_KEYUP          = 0x0291;
private const UInt32 WM_IME_NOTIFY         = 0x0282;
private const UInt32 WM_IME_REQUEST        = 0x0288;
private const UInt32 WM_IME_SELECT         = 0x0285;
private const UInt32 WM_IME_SETCONTEXT     = 0x0281;
private const UInt32 WM_IME_STARTCOMPOSITION   = 0x010D;
private const UInt32 WM_INITDIALOG         = 0x0110;
private const UInt32 WM_INITMENU           = 0x0116;
private const UInt32 WM_INITMENUPOPUP      = 0x0117;
private const UInt32 WM_INPUTLANGCHANGE    = 0x0051;
private const UInt32 WM_INPUTLANGCHANGEREQUEST = 0x0050;
private const UInt32 WM_KEYDOWN        = 0x0100;
private const UInt32 WM_KEYFIRST           = 0x0100;
private const UInt32 WM_KEYLAST        = 0x0108;
private const UInt32 WM_KEYUP          = 0x0101;
private const UInt32 WM_KILLFOCUS          = 0x0008;
private const UInt32 WM_LBUTTONDBLCLK      = 0x0203;
private const UInt32 WM_LBUTTONDOWN        = 0x0201;
private const UInt32 WM_LBUTTONUP          = 0x0202;
private const UInt32 WM_MBUTTONDBLCLK      = 0x0209;
private const UInt32 WM_MBUTTONDOWN        = 0x0207;
private const UInt32 WM_MBUTTONUP          = 0x0208;
private const UInt32 WM_MDIACTIVATE        = 0x0222;
private const UInt32 WM_MDICASCADE         = 0x0227;
private const UInt32 WM_MDICREATE          = 0x0220;
private const UInt32 WM_MDIDESTROY         = 0x0221;
private const UInt32 WM_MDIGETACTIVE       = 0x0229;
private const UInt32 WM_MDIICONARRANGE     = 0x0228;
private const UInt32 WM_MDIMAXIMIZE        = 0x0225;
private const UInt32 WM_MDINEXT        = 0x0224;
private const UInt32 WM_MDIREFRESHMENU     = 0x0234;
private const UInt32 WM_MDIRESTORE         = 0x0223;
private const UInt32 WM_MDISETMENU         = 0x0230;
private const UInt32 WM_MDITILE        = 0x0226;
private const UInt32 WM_MEASUREITEM        = 0x002C;
private const UInt32 WM_MENUCHAR           = 0x0120;
private const UInt32 WM_MENUCOMMAND        = 0x0126;
private const UInt32 WM_MENUDRAG           = 0x0123;
private const UInt32 WM_MENUGETOBJECT      = 0x0124;
private const UInt32 WM_MENURBUTTONUP      = 0x0122;
private const UInt32 WM_MENUSELECT         = 0x011F;
private const UInt32 WM_MOUSEACTIVATE      = 0x0021;
private const UInt32 WM_MOUSEFIRST         = 0x0200;
private const UInt32 WM_MOUSEHOVER         = 0x02A1;
private const UInt32 WM_MOUSELAST          = 0x020D;
private const UInt32 WM_MOUSELEAVE         = 0x02A3;
private const UInt32 WM_MOUSEMOVE          = 0x0200;
private const UInt32 WM_MOUSEWHEEL         = 0x020A;
private const UInt32 WM_MOUSEHWHEEL        = 0x020E;
private const UInt32 WM_MOVE           = 0x0003;
private const UInt32 WM_MOVING         = 0x0216;
private const UInt32 WM_NCACTIVATE         = 0x0086;
private const UInt32 WM_NCCALCSIZE         = 0x0083;
private const UInt32 WM_NCCREATE           = 0x0081;
private const UInt32 WM_NCDESTROY          = 0x0082;
private const UInt32 WM_NCHITTEST          = 0x0084;
private const UInt32 WM_NCLBUTTONDBLCLK    = 0x00A3;
private const UInt32 WM_NCLBUTTONDOWN      = 0x00A1;
private const UInt32 WM_NCLBUTTONUP        = 0x00A2;
private const UInt32 WM_NCMBUTTONDBLCLK    = 0x00A9;
private const UInt32 WM_NCMBUTTONDOWN      = 0x00A7;
private const UInt32 WM_NCMBUTTONUP        = 0x00A8;
private const UInt32 WM_NCMOUSEMOVE        = 0x00A0;
private const UInt32 WM_NCPAINT        = 0x0085;
private const UInt32 WM_NCRBUTTONDBLCLK    = 0x00A6;
private const UInt32 WM_NCRBUTTONDOWN      = 0x00A4;
private const UInt32 WM_NCRBUTTONUP        = 0x00A5;
private const UInt32 WM_NEXTDLGCTL         = 0x0028;
private const UInt32 WM_NEXTMENU           = 0x0213;
private const UInt32 WM_NOTIFY         = 0x004E;
private const UInt32 WM_NOTIFYFORMAT       = 0x0055;
private const UInt32 WM_NULL           = 0x0000;
private const UInt32 WM_PAINT          = 0x000F;
private const UInt32 WM_PAINTCLIPBOARD     = 0x0309;
private const UInt32 WM_PAINTICON          = 0x0026;
private const UInt32 WM_PALETTECHANGED     = 0x0311;
private const UInt32 WM_PALETTEISCHANGING      = 0x0310;
private const UInt32 WM_PARENTNOTIFY       = 0x0210;
private const UInt32 WM_PASTE          = 0x0302;
private const UInt32 WM_PENWINFIRST        = 0x0380;
private const UInt32 WM_PENWINLAST         = 0x038F;
private const UInt32 WM_POWER          = 0x0048;
private const UInt32 WM_POWERBROADCAST     = 0x0218;
private const UInt32 WM_PRINT          = 0x0317;
private const UInt32 WM_PRINTCLIENT        = 0x0318;
private const UInt32 WM_QUERYDRAGICON      = 0x0037;
private const UInt32 WM_QUERYENDSESSION    = 0x0011;
private const UInt32 WM_QUERYNEWPALETTE    = 0x030F;
private const UInt32 WM_QUERYOPEN          = 0x0013;
private const UInt32 WM_QUEUESYNC          = 0x0023;
private const UInt32 WM_QUIT           = 0x0012;
private const UInt32 WM_RBUTTONDBLCLK      = 0x0206;
private const UInt32 WM_RBUTTONDOWN        = 0x0204;
private const UInt32 WM_RBUTTONUP          = 0x0205;
private const UInt32 WM_RENDERALLFORMATS       = 0x0306;
private const UInt32 WM_RENDERFORMAT       = 0x0305;
private const UInt32 WM_SETCURSOR          = 0x0020;
private const UInt32 WM_SETFOCUS           = 0x0007;
private const UInt32 WM_SETFONT        = 0x0030;
private const UInt32 WM_SETHOTKEY          = 0x0032;
private const UInt32 WM_SETICON        = 0x0080;
private const UInt32 WM_SETREDRAW          = 0x000B;
private const UInt32 WM_SETTEXT        = 0x000C;
private const UInt32 WM_SETTINGCHANGE      = 0x001A;
private const UInt32 WM_SHOWWINDOW         = 0x0018;
private const UInt32 WM_SIZE           = 0x0005;
private const UInt32 WM_SIZECLIPBOARD      = 0x030B;
private const UInt32 WM_SIZING         = 0x0214;
private const UInt32 WM_SPOOLERSTATUS      = 0x002A;
private const UInt32 WM_STYLECHANGED       = 0x007D;
private const UInt32 WM_STYLECHANGING      = 0x007C;
private const UInt32 WM_SYNCPAINT          = 0x0088;
private const UInt32 WM_SYSCHAR        = 0x0106;
private const UInt32 WM_SYSCOLORCHANGE     = 0x0015;
private const UInt32 WM_SYSCOMMAND         = 0x0112;
private const UInt32 WM_SYSDEADCHAR        = 0x0107;
private const UInt32 WM_SYSKEYDOWN         = 0x0104;
private const UInt32 WM_SYSKEYUP           = 0x0105;
private const UInt32 WM_TCARD          = 0x0052;
private const UInt32 WM_TIMECHANGE         = 0x001E;
private const UInt32 WM_TIMER          = 0x0113;
private const UInt32 WM_UNDO           = 0x0304;
private const UInt32 WM_UNINITMENUPOPUP    = 0x0125;
private const UInt32 WM_USER           = 0x0400;
private const UInt32 WM_USERCHANGED        = 0x0054;
private const UInt32 WM_VKEYTOITEM         = 0x002E;
private const UInt32 WM_VSCROLL        = 0x0115;
private const UInt32 WM_VSCROLLCLIPBOARD       = 0x030A;
private const UInt32 WM_WINDOWPOSCHANGED       = 0x0047;
private const UInt32 WM_WINDOWPOSCHANGING      = 0x0046;
private const UInt32 WM_WININICHANGE       = 0x001A;
private const UInt32 WM_XBUTTONDBLCLK      = 0x020D;
private const UInt32 WM_XBUTTONDOWN        = 0x020B;
private const UInt32 WM_XBUTTONUP          = 0x020C;

VB Constants:

Public Enum WndMsg
   WM_ACTIVATE = &H6
   WM_ACTIVATEAPP = &H1C
   WM_AFXFIRST = &H360
   WM_AFXLAST = &H37F
   WM_APP = &H8000
   WM_ASKCBFORMATNAME = &H30C
   WM_CANCELJOURNAL = &H4B
   WM_CANCELMODE = &H1F
   WM_CAPTURECHANGED = &H215
   WM_CHANGECBCHAIN = &H30D
   WM_CHANGEUISTATE = &H127
   WM_CHAR = &H102
   WM_CHARTOITEM = &H2F
   WM_CHILDACTIVATE = &H22
   WM_CLEAR = &H303
   WM_CLOSE = &H10
   WM_COMMAND = &H111
   WM_COMPACTING = &H41
   WM_COMPAREITEM = &H39
   WM_CONTEXTMENU = &H7B
   WM_COPY = &H301
   WM_COPYDATA = &H4A
   WM_CREATE = &H1
   WM_CTLCOLORBTN = &H135
   WM_CTLCOLORDLG = &H136
   WM_CTLCOLOREDIT = &H133
   WM_CTLCOLORLISTBOX = &H134
   WM_CTLCOLORMSGBOX = &H132
   WM_CTLCOLORSCROLLBAR = &H137
   WM_CTLCOLORSTATIC = &H138
   WM_CUT = &H300
   WM_DEADCHAR = &H103
   WM_DELETEITEM = &H2D
   WM_DESTROY = &H2
   WM_DESTROYCLIPBOARD = &H307
   WM_DEVICECHANGE = &H219
   WM_DEVMODECHANGE = &H1B
   WM_DISPLAYCHANGE = &H7E
   WM_DRAWCLIPBOARD = &H308
   WM_DRAWITEM = &H2B
   WM_DROPFILES = &H233
   WM_ENABLE = &HA
   WM_ENDSESSION = &H16
   WM_ENTERIDLE = &H121
   WM_ENTERMENULOOP = &H211
   WM_ENTERSIZEMOVE = &H231
   WM_ERASEBKGND = &H14
   WM_EXITMENULOOP = &H212
   WM_EXITSIZEMOVE = &H232
   WM_FONTCHANGE = &H1D
   WM_GETDLGCODE = &H87
   WM_GETFONT = &H31
   WM_GETHOTKEY = &H33
   WM_GETICON = &H7F
   WM_GETMINMAXINFO = &H24
   WM_GETOBJECT = &H3D
   WM_GETTEXT = &HD
   WM_GETTEXTLENGTH = &HE
   WM_HANDHELDFIRST = &H358
   WM_HANDHELDLAST = &H35F
   WM_HELP = &H53
   WM_HOTKEY = &H312
   WM_HSCROLL = &H114
   WM_HSCROLLCLIPBOARD = &H30E
   WM_ICONERASEBKGND = &H27
   WM_IME_CHAR = &H286
   WM_IME_COMPOSITION = &H10F
   WM_IME_COMPOSITIONFULL = &H284
   WM_IME_CONTROL = &H283
   WM_IME_ENDCOMPOSITION = &H10E
   WM_IME_KEYDOWN = &H290
   WM_IME_KEYLAST = &H10F
   WM_IME_KEYUP = &H291
   WM_IME_NOTIFY = &H282
   WM_IME_REQUEST = &H288
   WM_IME_SELECT = &H285
   WM_IME_SETCONTEXT = &H281
   WM_IME_STARTCOMPOSITION = &H10D
   WM_INITDIALOG = &H110
   WM_INITMENU = &H116
   WM_INITMENUPOPUP = &H117
   WM_INPUTLANGCHANGE = &H51
   WM_INPUTLANGCHANGEREQUEST = &H50
   WM_KEYDOWN = &H100
   WM_KEYFIRST = &H100
   WM_KEYLAST = &H108
   WM_KEYUP = &H101
   WM_KILLFOCUS = &H8
   WM_LBUTTONDBLCLK = &H203
   WM_LBUTTONDOWN = &H201
   WM_LBUTTONUP = &H202
   WM_MBUTTONDBLCLK = &H209
   WM_MBUTTONDOWN = &H207
   WM_MBUTTONUP = &H208
   WM_MDIACTIVATE = &H222
   WM_MDICASCADE = &H227
   WM_MDICREATE = &H220
   WM_MDIDESTROY = &H221
   WM_MDIGETACTIVE = &H229
   WM_MDIICONARRANGE = &H228
   WM_MDIMAXIMIZE = &H225
   WM_MDINEXT = &H224
   WM_MDIREFRESHMENU = &H234
   WM_MDIRESTORE = &H223
   WM_MDISETMENU = &H230
   WM_MDITILE = &H226
   WM_MEASUREITEM = &H2C
   WM_MENUCHAR = &H120
   WM_MENUCOMMAND = &H126
   WM_MENUDRAG = &H123
   WM_MENUGETOBJECT = &H124
   WM_MENURBUTTONUP = &H122
   WM_MENUSELECT = &H11F
   WM_MOUSEACTIVATE = &H21
   WM_MOUSEFIRST = &H200
   WM_MOUSEHOVER = &H2A1
   WM_MOUSELAST = &H20D
   WM_MOUSELEAVE = &H2A3
   WM_MOUSEMOVE = &H200
   WM_MOUSEWHEEL = &H20A
   WM_MOUSEHWHEEL = &H20E
   WM_MOVE = &H3
   WM_MOVING = &H216
   WM_NCACTIVATE = &H86
   WM_NCCALCSIZE = &H83
   WM_NCCREATE = &H81
   WM_NCDESTROY = &H82
   WM_NCHITTEST = &H84
   WM_NCLBUTTONDBLCLK = &HA3
   WM_NCLBUTTONDOWN = &HA1
   WM_NCLBUTTONUP = &HA2
   WM_NCMBUTTONDBLCLK = &HA9
   WM_NCMBUTTONDOWN = &HA7
   WM_NCMBUTTONUP = &HA8
   WM_NCMOUSEMOVE = &HA0
   WM_NCPAINT = &H85
   WM_NCRBUTTONDBLCLK = &HA6
   WM_NCRBUTTONDOWN = &HA4
   WM_NCRBUTTONUP = &HA5
   WM_NEXTDLGCTL = &H28
   WM_NEXTMENU = &H213
   WM_NOTIFY = &H4E
   WM_NOTIFYFORMAT = &H55
   WM_NULL = &H0
   WM_PAINT = &HF
   WM_PAINTCLIPBOARD = &H309
   WM_PAINTICON = &H26
   WM_PALETTECHANGED = &H311
   WM_PALETTEISCHANGING = &H310
   WM_PARENTNOTIFY = &H210
   WM_PASTE = &H302
   WM_PENWINFIRST = &H380
   WM_PENWINLAST = &H38F
   WM_POWER = &H48
   WM_POWERBROADCAST = &H218
   WM_PRINT = &H317
   WM_PRINTCLIENT = &H318
   WM_QUERYDRAGICON = &H37
   WM_QUERYENDSESSION = &H11
   WM_QUERYNEWPALETTE = &H30F
   WM_QUERYOPEN = &H13
   WM_QUEUESYNC = &H23
   WM_QUIT = &H12
   WM_RBUTTONDBLCLK = &H206
   WM_RBUTTONDOWN = &H204
   WM_RBUTTONUP = &H205
   WM_RENDERALLFORMATS = &H306
   WM_RENDERFORMAT = &H305
   WM_SETCURSOR = &H20
   WM_SETFOCUS = &H7
   WM_SETFONT = &H30
   WM_SETHOTKEY = &H32
   WM_SETICON = &H80
   WM_SETREDRAW = &HB
   WM_SETTEXT = &HC
   WM_SETTINGCHANGE = &H1A
   WM_SHOWWINDOW = &H18
   WM_SIZE = &H5
   WM_SIZECLIPBOARD = &H30B
   WM_SIZING = &H214
   WM_SPOOLERSTATUS = &H2A
   WM_STYLECHANGED = &H7D
   WM_STYLECHANGING = &H7C
   WM_SYNCPAINT = &H88
   WM_SYSCHAR = &H106
   WM_SYSCOLORCHANGE = &H15
   WM_SYSCOMMAND = &H112
   WM_SYSDEADCHAR = &H107
   WM_SYSKEYDOWN = &H104
   WM_SYSKEYUP = &H105
   WM_TCARD = &H52
   WM_TIMECHANGE = &H1E
   WM_TIMER = &H113
   WM_UNDO = &H304
   WM_UNINITMENUPOPUP = &H125
   WM_USER = &H400
   WM_USERCHANGED = &H54
   WM_VKEYTOITEM = &H2E
   WM_VSCROLL = &H115
   WM_VSCROLLCLIPBOARD = &H30A
   WM_WINDOWPOSCHANGED = &H47
   WM_WINDOWPOSCHANGING = &H46
   WM_WININICHANGE = &H1A
   WM_XBUTTONDBLCLK = &H20D
   WM_XBUTTONDOWN = &H20B
   WM_XBUTTONUP = &H20C

End Enum

Masm constants in numeric order:

WM_NULL equ 000h

WM_CREATE equ 001h

WM_DESTROY equ 002h

WM_MOVE equ 003h

WM_SIZE equ 005h

WM_ACTIVATE equ 006h

WM_SETFOCUS equ 007h

WM_KILLFOCUS equ 008h

WM_ENABLE equ 00Ah

WM_SETREDRAW equ 00Bh

WM_SETTEXT equ 00Ch

WM_GETTEXT equ 00Dh

WM_GETTEXTLENGTH equ 00Eh

WM_PAINT equ 00Fh

WM_CLOSE equ 010h

WM_QUERYENDSESSION equ 011h

WM_QUIT equ 012h

WM_QUERYOPEN equ 013h

WM_ERASEBKGND equ 014h

WM_SYSCOLORCHANGE equ 015h

WM_ENDSESSION equ 016h

WM_SHOWWINDOW equ 018h

WM_SETTINGCHANGE equ 01Ah

WM_WININICHANGE equ 01Ah

WM_DEVMODECHANGE equ 01Bh

WM_ACTIVATEAPP equ 01Ch

WM_FONTCHANGE equ 01Dh

WM_TIMECHANGE equ 01Eh

WM_CANCELMODE equ 01Fh

WM_SETCURSOR equ 020h

WM_MOUSEACTIVATE equ 021h

WM_CHILDACTIVATE equ 022h

WM_QUEUESYNC equ 023h

WM_GETMINMAXINFO equ 024h

WM_PAINTICON equ 026h

WM_ICONERASEBKGND equ 027h

WM_NEXTDLGCTL equ 028h

WM_SPOOLERSTATUS equ 02Ah

WM_DRAWITEM equ 02Bh

WM_MEASUREITEM equ 02Ch

WM_DELETEITEM equ 02Dh

WM_VKEYTOITEM equ 02Eh

WM_CHARTOITEM equ 02Fh

WM_SETFONT equ 030h

WM_GETFONT equ 031h

WM_SETHOTKEY equ 032h

WM_GETHOTKEY equ 033h

WM_QUERYDRAGICON equ 037h

WM_COMPAREITEM equ 039h

WM_GETOBJECT equ 03Dh

WM_COMPACTING equ 041h

WM_OTHERWINDOWCREATED equ 042h

WM_OTHERWINDOWDESTROYED equ 043h

WM_COMMNOTIFY equ 044h

WM_WINDOWPOSCHANGING equ 046h

WM_WINDOWPOSCHANGED equ 047h

WM_POWER equ 048h

WM_COPYDATA equ 04Ah

WM_CANCELJOURNAL equ 04Bh

WM_NOTIFY equ 04Eh

WM_INPUTLANGCHANGEREQUEST equ 050h

WM_INPUTLANGCHANGE equ 051h

WM_TCARD equ 052h

WM_HELP equ 053h

WM_USERCHANGED equ 054h

WM_NOTIFYFORMAT equ 055h

WM_CONTEXTMENU equ 07Bh

WM_STYLECHANGING equ 07Ch

WM_STYLECHANGED equ 07Dh

WM_DISPLAYCHANGE equ 07Eh

WM_GETICON equ 07Fh

WM_SETICON equ 080h

WM_NCCREATE equ 081h

WM_NCDESTROY equ 082h

WM_NCCALCSIZE equ 083h

WM_NCHITTEST equ 084h

WM_NCPAINT equ 085h

WM_NCACTIVATE equ 086h

WM_GETDLGCODE equ 087h

WM_SYNCPAINT equ 088h

WM_NCMOUSEMOVE equ 0A0h

WM_NCLBUTTONDOWN equ 0A1h

WM_NCLBUTTONUP equ 0A2h

WM_NCLBUTTONDBLCLK equ 0A3h

WM_NCRBUTTONDOWN equ 0A4h

WM_NCRBUTTONUP equ 0A5h

WM_NCRBUTTONDBLCLK equ 0A6h

WM_NCMBUTTONDOWN equ 0A7h

WM_NCMBUTTONUP equ 0A8h

WM_NCMBUTTONDBLCLK equ 0A9h

WM_NCXBUTTONDOWN equ 0ABh

WM_NCXBUTTONUP equ 0ACh

WM_NCXBUTTONDBLCLK equ 0ADh

WM_KEYFIRST equ 100h

WM_KEYDOWN equ 100h

WM_KEYUP equ 101h

WM_CHAR equ 102h

WM_DEADCHAR equ 103h

WM_SYSKEYDOWN equ 104h

WM_SYSKEYUP equ 105h

WM_SYSCHAR equ 106h

WM_SYSDEADCHAR equ 107h

WM_KEYLAST equ 108h

WM_UNICHAR equ 109h

WM_IME_STARTCOMPOSITION equ 10Dh

WM_IME_ENDCOMPOSITION equ 10Eh

WM_IME_COMPOSITION equ 10Fh

WM_IME_KEYLAST equ 10Fh

WM_INITDIALOG equ 110h

WM_COMMAND equ 111h

WM_SYSCOMMAND equ 112h

WM_TIMER equ 113h

WM_HSCROLL equ 114h

WM_VSCROLL equ 115h

WM_INITMENU equ 116h

WM_INITMENUPOPUP equ 117h

WM_MENUSELECT equ 11Fh

WM_MENUCHAR equ 120h

WM_ENTERIDLE equ 121h

WM_MENURBUTTONUP equ 122h

WM_MENUDRAG equ 123h

WM_MENUGETOBJECT equ 124h

WM_UNINITMENUPOPUP equ 125h

WM_MENUCOMMAND equ 126h

WM_CHANGEUISTATE equ 127h

WM_UPDATEUISTATE equ 128h

WM_QUERYUISTATE equ 129h

WM_CTLCOLORMSGBOX equ 132h

WM_CTLCOLOREDIT equ 133h

WM_CTLCOLORLISTBOX equ 134h

WM_CTLCOLORBTN equ 135h

WM_CTLCOLORDLG equ 136h

WM_CTLCOLORSCROLLBAR equ 137h

WM_CTLCOLORSTATIC equ 138h

WM_MOUSEFIRST equ 200h

WM_MOUSEMOVE equ 200h

WM_LBUTTONDOWN equ 201h

WM_LBUTTONUP equ 202h

WM_LBUTTONDBLCLK equ 203h

WM_RBUTTONDOWN equ 204h

WM_RBUTTONUP equ 205h

WM_RBUTTONDBLCLK equ 206h

WM_MBUTTONDOWN equ 207h

WM_MBUTTONUP equ 208h

;WM_MOUSELAST equ 209h

WM_MBUTTONDBLCLK equ 209h

WM_MOUSEWHEEL equ 20Ah

WM_MOUSEHWHEEL equ 20Eh

WM_XBUTTONDOWN equ 20Bh

WM_XBUTTONUP equ 20Ch

WM_XBUTTONDBLCLK equ 20Dh

WM_PARENTNOTIFY equ 210h

WM_ENTERMENULOOP equ 211h

WM_EXITMENULOOP equ 212h

WM_NEXTMENU equ 213h

WM_SIZING equ 214h

WM_CAPTURECHANGED equ 215h

WM_MOVING equ 216h

WM_POWERBROADCAST equ 218h

WM_DEVICECHANGE equ 219h

WM_MDICREATE equ 220h

WM_MDIDESTROY equ 221h

WM_MDIACTIVATE equ 222h

WM_MDIRESTORE equ 223h

WM_MDINEXT equ 224h

WM_MDIMAXIMIZE equ 225h

WM_MDITILE equ 226h

WM_MDICASCADE equ 227h

WM_MDIICONARRANGE equ 228h

WM_MDIGETACTIVE equ 229h

WM_MDISETMENU equ 230h

WM_ENTERSIZEMOVE equ 231h

WM_EXITSIZEMOVE equ 232h

WM_DROPFILES equ 233h

WM_MDIREFRESHMENU equ 234h

WM_NCMOUSEHOVER equ 2A0h

WM_MOUSEHOVER equ 2A1h

WM_IME_SETCONTEXT equ 281h

WM_IME_NOTIFY equ 282h

WM_IME_CONTROL equ 283h

WM_IME_COMPOSITIONFULL equ 284h

WM_IME_SELECT equ 285h

WM_IME_CHAR equ 286h

WM_IME_REQUEST equ 288h

WM_IME_KEYDOWN equ 290h

WM_IME_KEYUP equ 291h

WM_MOUSEHOVER equ 2A1h

WM_NCMOUSELEAVE equ 2A2h

WM_MOUSELEAVE equ 2A3h

WM_WTSSESSION_CHANGE equ 2B1h

WM_TABLET_FIRST equ 2c0h

WM_TABLET_LAST equ 2dfh

WM_CUT equ 300h

WM_COPY equ 301h

WM_PASTE equ 302h

WM_CLEAR equ 303h

WM_UNDO equ 304h

WM_RENDERFORMAT equ 305h

WM_RENDERALLFORMATS equ 306h

WM_DESTROYCLIPBOARD equ 307h

WM_DRAWCLIPBOARD equ 308h

WM_PAINTCLIPBOARD equ 309h

WM_VSCROLLCLIPBOARD equ 30Ah

WM_SIZECLIPBOARD equ 30Bh

WM_ASKCBFORMATNAME equ 30Ch

WM_CHANGECBCHAIN equ 30Dh

WM_HSCROLLCLIPBOARD equ 30Eh

WM_QUERYNEWPALETTE equ 30Fh

WM_PALETTEISCHANGING equ 310h

WM_PALETTECHANGED equ 311h

WM_HOTKEY equ 312h

WM_PRINT equ 317h

WM_PRINTCLIENT equ 318h

WM_APPCOMMAND equ 319h

WM_THEMECHANGED equ 31Ah

WM_HANDHELDFIRST equ 358h

WM_HANDHELDLAST equ 35Fh

WM_AFXFIRST equ 360h

WM_AFXLAST equ 37Fh

WM_PENWINFIRST equ 380h

WM_PENWINLAST equ 38Fh

WM_USER equ 400h

Notes:

None.

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