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WNDCLASS (Structures)
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C# Definition:
[StructLayout(LayoutKind.Sequential)]
struct WNDCLASS {
public uint style;
[MarshalAs(UnmanagedType.FunctionPtr)]
public WndProc lpfnWndProc;
public int cbClsExtra;
public int cbWndExtra;
public IntPtr hInstance;
public IntPtr hIcon;
public IntPtr hCursor;
public IntPtr hbrBackground;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpszMenuName;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpszClassName;
}
User-Defined Field Types:
None.
Notes:
style
Specifies the class style(s). This member can be any combination of the ClassStyles.
lpfnWndProc
Pointer to the window procedure. You must use the CallWindowProc function to call the window procedure. For more information, see WindowProc.
cbClsExtra
Specifies the number of extra bytes to allocate following the window-class structure. The system initializes the bytes to zero.
cbWndExtra
Specifies the number of extra bytes to allocate following the window instance. The system initializes the bytes to zero. If an application uses WNDCLASS to register a dialog box created by using the CLASS directive in the resource file, it must set this member to DLGWINDOWEXTRA.
hInstance
Handle to the instance that contains the window procedure for the class.
hIcon
Handle to the class icon. This member must be a handle to an icon resource. If this member is NULL, the system provides a default icon.
hCursor
Handle to the class cursor. This member must be a handle to a cursor resource. If this member is NULL, an application must explicitly set the cursor shape whenever the mouse moves into the application's window.
hbrBackground
Handle to the class background brush. This member can be a handle to the physical brush to be used for painting the background, or it can be a color value. A color value must be one of the following standard system colors (the value 1 must be added to the chosen color). If a color value is given, you must convert it to one of the following HBRUSH types:
COLOR_ACTIVEBORDER
COLOR_ACTIVECAPTION
COLOR_APPWORKSPACE
COLOR_BACKGROUND
COLOR_BTNFACE
COLOR_BTNSHADOW
COLOR_BTNTEXT
COLOR_CAPTIONTEXT
COLOR_GRAYTEXT
COLOR_HIGHLIGHT
COLOR_HIGHLIGHTTEXT
COLOR_INACTIVEBORDER
COLOR_INACTIVECAPTION
COLOR_MENU
COLOR_MENUTEXT
COLOR_SCROLLBAR
COLOR_WINDOW
COLOR_WINDOWFRAME
COLOR_WINDOWTEXT
The system automatically deletes class background brushes when the class is unregistered by using UnregisterClass. An application should not delete these brushes.
When this member is NULL, an application must paint its own background whenever it is requested to paint in its client area. To determine whether the background must be painted, an application can either process the WM_ERASEBKGND message or test the fErase member of the PAINTSTRUCT structure filled by the BeginPaint function.
lpszMenuName
Pointer to a null-terminated character string that specifies the resource name of the class menu, as the name appears in the resource file. If you use an integer to identify the menu, use the MAKEINTRESOURCE macro. If this member is NULL, windows belonging to this class have no default menu.
lpszClassName
Pointer to a null-terminated string or is an atom. If this parameter is an atom, it must be a class atom created by a previous call to the RegisterClass or RegisterClassEx function. The atom must be in the low-order word of lpszClassName; the high-order word must be zero.
If lpszClassName is a string, it specifies the window class name. The class name can be any name registered with RegisterClass or RegisterClassEx, or any of the predefined control-class names.
The maximum length for lpszClassName is 256.
The RegisterClassEx API registers a new window class to be created using CreateWindow or CreateWindowEx.
9/20/2015 5:34:39 AM - anonymous
The '''WNDCLASSEX''' structure contains window class information. It is used with the RegisterClassEx and GetClassInfoEx functions. The '''WNDCLASSEX''' structure is similar to the Structures.[WNDCLASS] structure. There are two differences. '''WNDCLASSEX''' includes the '''cbSize''' member, which specifies the size of the structure, and the '''hIconSm''' member, which contains a handle to a small icon associated with the window class.