please dont rip this site Prev Next

GetAsyncKeyState info  Overview  Group

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



Specifies one of 256 possible virtual-key codes.

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.

Return Values

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:







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.

The GetAsyncKeyState function works with mouse buttons. However, it checks on the state of the physical mouse buttons, not on the logical mouse buttons that the physical buttons are mapped to. For example, the call GetAsyncKeyState(VK_LBUTTON) always returns the state of the left physical mouse button, regardless of whether it is mapped to the left or right logical mouse button. You can determine the systemís current mapping of physical mouse buttons to logical mouse buttons by calling


which returns TRUE if the mouse buttons have been swapped.

See Also

GetKeyboardState, GetKeyState, GetSystemMetrics, MapVirtualKey, SetKeyboardState 

file: /Techref/os/win/api/win32/func/src/f27_3.htm, 4KB, , updated: 2000/4/7 12:19, local time: 2022/5/26 14:40,

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> GetAsyncKeyState</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2022 contributors:
o List host: MIT, Site host, Top posters @20220526
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.

Welcome to!