@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: 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. !!!!C# Definition: [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct WNDCLASSEX { [MarshalAs(UnmanagedType.U4)] public int cbSize; [MarshalAs(UnmanagedType.U4)] public int style; public IntPtr lpfnWndProc; // not WndProc public int cbClsExtra; public int cbWndExtra; public IntPtr hInstance; public IntPtr hIcon; public IntPtr hCursor; public IntPtr hbrBackground; public string lpszMenuName; public string lpszClassName; public IntPtr hIconSm; //Use this function to make a new one with cbSize already filled in. //For example: //var WndClss = WNDCLASSEX.Build() public static WNDCLASSEX Build() { var nw = new WNDCLASSEX(); nw.cbSize = Marshal.SizeOf(typeof (WNDCLASSEX)); return nw; } } !!!!VB Definition: <StructLayout(LayoutKind.Sequential)> _ Structure WNDCLASSEX Public cbSize As UInteger Public style As ClassStyles <MarshalAs(UnmanagedType.FunctionPtr)> Public lpfnWndProc As IntPtr Public cbClsExtra As Integer Public cbWndExtra As Integer Public hInstance As IntPtr Public hIcon As IntPtr Public hCursor As IntPtr Public hbrBackground As IntPtr Public lpszMenuName As String Public lpszClassName As String Public hIconSm As IntPtr ' Use this function to make a new one with cbSize already filled in. ' For example: 'Dim WndClss As WNDCLASSEX = WNDCLASSEX.GetNew() Shared Function MakeNew() Dim nw as New WNDCLASSEX nw.cbSize=Marshal.SizeOf(GetType(WNDCLASSEX)) return nw End Function End Structure !!!!IMPORTANT: The two strings were previously defined at pinvoke.net as: <MarshalAs(UnmanagedType.LPTStr)> _ Public lpszMenuName As String <MarshalAs(UnmanagedType.LPTStr)> _ Public lpszClassName As String The MarshalAs attributes cause class registration to fail. They have been removed. !!!!User-Defined Types: WndProc, ClassStyles !!!!Notes: * '''cbSize''' * Specifies the size, in bytes, of this structure. Set this member to sizeof(WNDCLASSEX). Be sure to set this member before calling the '''GetClassInfoEx''' function. * '''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 WndProc. * '''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 '''WNDCLASSEX''' 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 Structures.[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. * '''hIconSm''' * Handle to a small icon that is associated with the window class. If this member is NULL, the system searches the icon resource specified by the '''hIcon''' member for an icon of the appropriate size to use as the small icon. Documentation: WNDCLASSEX@msdn on MSDN
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