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Vahokif's picture

Low-level keyboard

Posted Sunday, 5 July, 2009 - 13:07 by Vahokif in

I've been writing a 3D browser using OpenTK and Awesomium. Everything works great, except the function used to simulate keyboard events: void injectKeyboardEvent(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam). I tried using SetWindowsHookEx with WH_GETMESSAGE to catch keyboard messages to GameWindow and pass them on, but all I got are CHAR messages and bogus results. What would be the best way to send GameWindow keyboard events to the browser?

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the Fiddler's picture

Re: Low-level keyboard

Posted Sunday, 5 July, 2009 - 13:45 by the Fiddler

WM_KEYDOWN/WM_KEYUP messages are intercepted by the IInputDriver before they reach GameWindow, so this approach probably won't work. Try installing a global WH_KEYBOARD_LL hook.

Vahokif's picture

Re: Low-level keyboard

Posted Sunday, 5 July, 2009 - 13:51 by Vahokif

I'd prefer to write most of the app in C# which means I can't use global hooks, and I'd like to capture some messages that KEYBOARD_LL doesn't. Also, I need the HWND of the GameWindow. Can I modify OpenTK's keyboard input somehow so I have access to the raw messages?

the Fiddler's picture

Re: Low-level keyboard

Posted Sunday, 5 July, 2009 - 14:12 by the Fiddler
  • You can write global hooks in pure C#: this example implements a WH_KEYBOARD_LL.
  • You can obtain the GameWindow handle through the WindowInfo.Handle property.
  • The current keyboard driver resides in Source/OpenTK/Platform/Windows/WMInput.cs, but modifying that is not advisable - OpenTK input will be completely rewritten over the next few weeks (it will become independent from the GameWindow).

Fortunately, there may be a simpler method to implement this functionality: hook GameWindow.KeyDown/KeyUp and synthesize WM_KEYDOWN/WM_KEYUP events for the browser via PostMessage.

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