The GetAsyncKeyState function determines whether a key is up or down at the time the function is called, and whether the key was pressed after a previous call to GetAsyncKeyState.
SHORT GetAsyncKeyState(
int vKey |
// virtual-key code |
); |
Windows NT: You can use left- and right-distinguishing constants to specify certain keys. See the Remarks section for further information.
Windows 95: Windows 95 does not support the left- and right-distinguishing constants available on Windows NT.
If the function succeeds, the return value specifies whether the key was pressed since the last call to GetAsyncKeyState, and whether the key is currently up or down. If the most significant bit is set, the key is down, and if the least significant bit is set, the key was pressed after the previous call to GetAsyncKeyState. The return value is zero if a window in another thread or process currently has the keyboard focus.
Windows 95: Windows 95 does not support the left- and right-distinguishing constants. If you call GetAsyncKeyState on the Windows 95 platform with these constants, the return value is zero.
You can use the virtual-key code constants VK_SHIFT, VK_CONTROL, and VK_MENU as values for the vKey parameter. This gives the state of the SHIFT, CTRL, or ALT keys without distinguishing between left and right.
Windows NT: You can use the following virtual-key code constants as values for vKey to distinguish between the left and right instances of those keys:
VK_LSHIFT |
VK_RSHIFT |
VK_LCONTROL |
VK_RCONTROL |
VK_LMENU |
VK_RMENU |
These left- and right-distinguishing constants are only available when you call the GetKeyboardState, SetKeyboardState, GetAsyncKeyState, GetKeyState, and MapVirtualKey functions.
Windows 95: Windows 95 does not support the left- and right-distinguishing constants, and returns 0 when you use these constants.
GetSystemMetrics(SM_SWAPBUTTON)
which returns TRUE if the mouse buttons have been swapped.
GetKeyboardState, GetKeyState, GetSystemMetrics, MapVirtualKey, SetKeyboardState
file: /Techref/os/win/api/win32/func/src/f27_3.htm, 4KB, , updated: 2000/4/7 11:19, local time: 2024/11/4 13:36,
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