How can I send keyboard input to a OpenGL/DirectX game window?

Question

How can I simulate a keypress in a game window (using any programming language in Windows)?

AutoHotKeys Scripts and .NET SendKeys functions do not work...

Answer 1

Any programming language? My recommendation is to write up a little app in C or C++ (although you could also do this in a .NET app with P/Invoke).

Specifically, you're looking for the SendInput function from the Win32 API, which can send low-level keyboard and mouse input to an application. It does this in terms of an INPUT structure that contains the information you want to send.

Of course, use of this function is subject to UIPI, which means that the application you're injecting input into must be running at an equal or lesser integrity level than the application that is doing the injecting.

However, since this function is generally what SendKeys uses under the covers, that last little caveat might be why it isn't working. It's hard to say exactly; you don't tell us what you mean by "do not work".