How do I send key strokes to a window without having to activate it using Windows API?

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Alright, this is kind of disappointing I’m sure, but you fundamentally cannot do this with 100% reliability.

Windows assumes that the active window is the one getting keyboard input. The proper way to fake keyboard input is with SendInput, and you’ll notice that it sends messages to the active window only.

That being said, you can SendMessage WM_KEYUP, WM_CHAR, and WM_KEYDOWN messages and (depending on the WndProc receiving them) maybe get away with it. But remember, its going to break under some circumstances, period.

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