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c++windowskeyboardscancodes

Get scan code from WM_CHAR message

How can I convert a character of any language that I catch via WM_CHAR in WndProc to a keyboard scan code? Like if the button pressed is x it would return 0x2d and etc.

Solution

  • The scan code is in bits 16-23 of the lParam parameter according to the WM_CHAR documentation, so just shift and mask:

    int scanCode = (lParam >> 16) & 0xff;

    If you've got a character you can call OemKeyScan, which puts the scan code in the low byte:

    char c='X';
int scanCode=OemKeyScan(c) & 0x0ff;