Question about KEYBDINPUT structure

Question

I'm reading this article: https://learn.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-keybdinput

In the Remarks part, it says that "The virtual key value of a key may alter depending on the current keyboard layout or what other keys were pressed, but the scan code will always be the same."
However, as far as I know. The scan code may be different for different keyboards but the keyboard's driver will translate the scan code to virtual key value for the OS to handle the input.
So should it be the scan code of a key may alter depending on the current keyboard, but the virtual code will always be the same?

Please correct me if I'm wrong. Thanks!

Answer 1

Hello @Xiaodong Hu ,

The virtual key value of a key may alter depending on the current keyboard layout or what other keys were pressed, but the scan code will always be the same.

This is based on the the fact that OS is Windows and hardware is not changed.

Since the scan code is from hardware so if the hardware keeps unchanged and scan code will be the same.

Since the keyboard layout can be changed via Settings. There is a such case, virtual code [VK_OEM_4 (0xDB) in the US standard keyboard is correspond the '{' key but maybe another different key in another different keyboard layout.

Thank you!

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