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.
Syntax
HMENU GetSystemMenu(
HWND hWnd,
BOOL bRevert
);
Parameters
- hWnd
-
[in] Handle to the window that will own a copy of the window menu.
- bRevert
-
[in] Specifies the action to be taken. If this parameter is FALSE, GetSystemMenu returns a handle to the copy of the window menu currently in use. The copy is initially identical to the window menu, but it can be modified. If this parameter is TRUE, GetSystemMenu resets the window menu back to the default state. The previous window menu, if any, is destroyed.
Return Value
If the bRevert parameter is FALSE, the return value is a handle to a copy of the window menu. If the bRevert parameter is TRUE, the return value is NULL.
Remarks
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.
The system 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.
Function Information
| Minimum DLL Version | user32.dll |
|---|
| Header | Declared in Winuser.h, include Windows.h |
|---|
| Import library | User32.lib |
|---|
| Minimum operating systems |
Windows 95, Windows NT 3.1 |
|---|
| Unicode | Implemented as
Unicode version. |
|---|
See Also