Re: [Qemu-devel] Keyboard patch for windows

[Fabrice Bellard <fabrice@bellard.org>]

 From the windows API it seems that the bit 24 of lParam in the message 
WM_KEYDOWN contains what you want. From the SDL source code, it seems to 
be passed in the scancode field...

Fabrice.

Erik Karlsson wrote:
> The problem is that some of the keycodes are prefixed with an e0 prefix.
> 
> Examples:
> Numpad right arrow/6: 4d	Right arrow:   e0,4d
> Numpad left arrow/4:  4b	Left arrow:    e0,4b
> Left alt:	      38	Right alt:     e0,38
> Left control:	      1d	Right control: e0,1d
> 
> The problem withs SDL is that SDL strips off the e0 prefix. The result
> is that it is impossible to distinguish between e.g. the arrow keys and
> the arrow on the numeric keypad and between left and right alt and
> contol keys.
> 
> Another advantage with low level keyboard hooks is that you can capture
> system key combinations such as Alt-Tab and Ctrl-Esc. sdl_grab_start()
> does not do that on windows.
> 
> I agree that it is unclean to have native windows code in an SDL driver.
> It would of course be better to have a separate keyboard driver for
> windows. The problem is that the qemu architecture does not allow
> separate drivers for keyboard, mouse and display. This makes a windows
> driver just for the keybord impossible. A windows driver would then need
> to implement keyboard, mouse and display natively on windows.
> 
> Erik
> 
> 
>>Strange since Windows should send the raw keycodes directly to SDL. I 
>>think your patch is too complicated to be integrated in an SDL target. 
>>Can you find a simpler solution ?
>>
>>Fabrice.
>>
>>Erik Karlsson wrote:
>>
>>>Keyboard input via SDL on windows it not working well. It is for example
>>>impossible to distinguish between left and rihgt alt and control and
>>>between the arrow keys and the numpad arrow keys.
>>>
>>>I have fixed this problem by using windows low level keyboadrd hooks
>>> (SetWindowsHookEx, WH_KEYBOARD_LL) instead of SDL for keyboard input.
>>>
>>>Low level keybord hooks should work on windows NT 4.0 SP3 or later, eg.
>>>windows 2000 and windows XP but not on windows 9x. For this reason I use
>>>another method if low level keyboard hooks are unsupported. Tihis method
>>>involves hooking up the winidow procedure and using some ugly fixes and
>>>there is still problems when you press the two shift keys simultaneously.
>>>I have however not tested this method on win9x because i have no win9x
>>>machine to test it on.
>>>
>>>Erik
> 
> 
> 
> 
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