为什么winapi函数有键盘驱动还需要扫码？

Question

typedef struct tagKEYBDINPUT {
  WORD      wVk;
  WORD      wScan;
  DWORD     dwFlags;
  DWORD     time;
  ULONG_PTR dwExtraInfo;
} KEYBDINPUT, *PKEYBDINPUT, *LPKEYBDINPUT;

wVk
Type: WORD
A virtual-key code. The code must be a value in the range 1 to 254. If the dwFlags member specifies KEYEVENTF_UNICODE, wVk must be 0.

键盘驱动程序会将虚拟键码转换为扫描码。但是为什么winapi函数需要扫码呢？是不是因为API直接告诉OS，不依赖键盘驱动？

Answer 1

下面Remarks解释了一个好处。

Set the KEYEVENTF_SCANCODE flag to define keyboard input in terms of the scan code. This is useful to simulate a physical keystroke regardless of which keyboard is currently being used. 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.

为什么winapi函数有键盘驱动还需要扫码？

Why do winapi functions need scan code although there is a keyboard driver?

winapi

scancodes