GetASyncKeyState | Together C & C++ | Page 1

grim moth Apr 6, 2024, 1:22 PM

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Basically when I get a key state of a key that is being held down it is giving me -32786 which is correct but when its still pressed down and another key is pressed it sets it back to 0

Example to make this easier:

Space key is down -> GetAsyncKeyState(VK_SPACE) = -32768 -> pressed CTRL while space is still down -> GetAsyncKeyState(VK_SPACE) = 0 even though its still pressed.

So what I'm trying to keep the value as it is as the keystate of Space is still down

odd basaltBOT Apr 6, 2024, 1:22 PM

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hushed wharf Apr 6, 2024, 3:32 PM

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I think you should SetWindowsHookEx for capture keyboard events.

surreal ledge Apr 6, 2024, 3:32 PM

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I am uncertain, but I believe what may be happening is that Windows is converting the key combination to a modifier combination key CTRL+SPACE which it treats as a different virtual key

hushed wharf Apr 6, 2024, 3:33 PM

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hook is more easier and isn't missing keyboards.

surreal ledge Apr 6, 2024, 3:35 PM

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I suspect it could be done by tracking keydown and key up events for the modifier keys (ctrl, alt, shift) and one other key as I am pretty sure you can only have 4 keys pressed at a time and be detected. Here I press ctrl/alt/shift/space and then release them in some random order:

keydown  keyCode=17        which=17        charCode=0        
         shiftKey=false ctrlKey=true  altKey=false metaKey=false
keydown  keyCode=18        which=18        charCode=0        
         shiftKey=false ctrlKey=true  altKey=true  metaKey=false
keydown  keyCode=16        which=16        charCode=0        
         shiftKey=true  ctrlKey=true  altKey=true  metaKey=false
keydown  keyCode=32  ( )   which=32  ( )   charCode=0        
         shiftKey=true  ctrlKey=true  altKey=true  metaKey=false
keyup    keyCode=32  ( )   which=32  ( )   charCode=0        
         shiftKey=true  ctrlKey=true  altKey=true  metaKey=false
keyup    keyCode=16        which=16        charCode=0        
         shiftKey=false ctrlKey=true  altKey=true  metaKey=false
keyup    keyCode=17        which=17        charCode=0        
         shiftKey=false ctrlKey=false altKey=true  metaKey=false
keyup    keyCode=18        which=18        charCode=0        
         shiftKey=false ctrlKey=false altKey=false metaKey=false

You can play with this tool at https://unixpapa.com/js/testkey.html

#GetASyncKeyState