Home > Windows API > How to know whether Ctrl, Alt… keys are down

How to know whether Ctrl, Alt… keys are down

Use GetKeyState.  If higher order bit of return value is 1 ie if return value is 0x8000 then the key is down. (0x8000 is equivalent to 1000 0000 0000 0000 )

bool IsCtrlPressed()
{
      return ( GetKeyState( VK_CONTROL ) & 0x8000 ) == 0x8000 );
} 

bool IsAltPressed()
{
     return ( GetKeyState( VK_MENU ) & 0x8000 ) == 0x8000 );
}
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