The GetSystemMenu function allows the application to access the window menu (also known as the System menu or the Control menu) for copying and modifying.
HMENU GetSystemMenu(
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HWND hWnd, |
// handle of window to own window menu |
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BOOL bRevert |
// reset flag |
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); |
If this parameter is TRUE, GetSystemMenu resets the window menu back to the Windows default state. The previous window menu, if any, is destroyed.
If the bRevert parameter is FALSE, the return value is the handle of a copy of the window menu. If the bRevert parameter is TRUE, the return value is NULL.
Any window that does not use the GetSystemMenu function to make its own copy of the window menu receives the standard window menu.
The window menu initially contains items with various identifier values, such as SC_CLOSE, SC_MOVE, and SC_SIZE.
Menu items on the window menu send WM_SYSCOMMAND messages.
All predefined window menu items have identifier numbers greater than 0xF000. If an application adds commands to the window menu, it should use identifier numbers less than 0xF000.
Windows automatically grays items on the standard window menu, depending on the situation. The application can perform its own checking or graying by responding to the WM_INITMENU message that is sent before any menu is displayed.