PostMessage & WM_KEYDOWN

[李浩]

HWND hWnd0 = User32.INSTANCE.FindWindow(null, "雷电模拟器(64)");

HWND hWnd1 = User32.INSTANCE.FindWindowEx(hWnd0, null, "RenderWindow", null);

// Hold 'W' key

User32.INSTANCE.PostMessage(hWnd1, WinUser.WM_KEYDOWN, new WPARAM(0x57), new LPARAM(0)); 

// That is works, but the game character only moves forward a bit

// Shouldn't the meaning of'WinUser.WM_KEYDOWN' mean holding down all the time?

// How do I keep holding down the'W' key until I call the'keyUp' method

[Durchholz, Joachim]

It’s just the way Microsoft defined how WM_KEYDOWN should work.

See https://docs.microsoft.com/en-us/windows/win32/inputdev/wm-keydown for full details.

https://docs.microsoft.com/en-us/windows/win32/inputdev/about-keyboard-input explains under what circumstances Windows sends what WM_KEY messages, and any library code that accepts keyboard data will expect that, so you should take care that you replicate Windows’ behaviour as exactly as possible.

 

(The other approach might be to directly call the “move the character code” instead of going through sending a message. If that’s a viable option for your use case, you’ll have far less moving parts that may affect how your code works.)

 

Regards,

Jo

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