Obtaining the virtual key code from a WM_CHAR message
I am getting text input and keypress input from the WM_CHAR and WM_KEYDOWN messages
What I want to do is filter out WM_CHAR messag开发者_JAVA百科es the have the same VK_ code as the key that is bound to enable the control that you enter text in.
EG: Game uses ~ to enable console, key binding is done via VK_OEM3 and WM_KEYDOWN, but text input into the console needs text from WM_CHAR.
As the WM_KEYDOWN happens first, the console is activated, then a WM_CHAR of ~ is sent to the console buffer which I don't want.
I figured the best way to prevent this is to compare the VK_ from the WM_CHAR to the bound key for the control and filter it out.
Is there a way to get the VK_ from a WM_CHAR message?
I read that you can get the scancode out of Lparam at bits 16-23
But am unsure how to:
- Extract the value of the scancode from lparam
- Translate the scan code to a VK_ correctly
After some messing around I managed to extract the virtual key with the following code:
This code gets the address of lParam as a unsigned char array (one byte of length), then uses pointer arithmatic to address the 3rd byte (bits 16-23):
unsigned char scancode = ((unsigned char*)&lParam)[2];
This code translates from the scancode to the virtual key:
unsigned int virtualKey = MapVirtualKey(scancode,MAPVK_VSC_TO_VK);
Perhaps you migh use MapVirtualKey.
I am not sure how to extract scancode from lparam as documentation does not state that - either get entire lparam and count that this function knows which bits to look at, or use bitfield struct and just get right bits out of it. I think on of those methods should work - trying both shouldn't be difficult.
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