bug report/suggested temp. patch: handling bursts of sent keys
Sat Jan 23 22:02:00 GMT 2010
> Hi Mark.
> I am a bit new to this list, but not THAT new to programming. If you don't
> know how many keystrokes you need to have a buffer for, then you have 2
> 1. Have a ridiculously huge buffer.
> 2. Setup a dynamic array.
> Using a 25000 character buffer seems like overkill. But mieq.c is probably
> reading just from the Operating Systems' keyboard buffer.
> You may need to write an input function to feed mieq.c and somehow link to
> it. Sadly, that level of coding is beyond my abilities.
Option 1 would be a temporary patch. Browsing through the source
code, keypresses/releases come one at a time in via window messages to
the following routine in hw/xwin/winwndproc.c:
* Called by winWakeupHandler
* Processes current Windows message
winWindowProc (HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
if (s_pScreenPriv == NULL || s_pScreenInfo->fIgnoreInput)
/* Translate Windows key code to X scan code */
winTranslateKey (wParam, lParam, &iScanCode);
/* Ignore repeats for CapsLock */
if (wParam == VK_CAPITAL)
lParam = 1;
/* Send the key event(s) */
for (i = 0; i < LOWORD(lParam); ++i)
winSendKeyEvent (iScanCode, TRUE);
winSendKeyEvent in turn lives in hw/xwin/winkeybd.c:
* Take a raw X key code and send an up or down event for it.
* Thanks to VNC for inspiration, though it is a simple function.
winSendKeyEvent (DWORD dwKey, Bool fDown)
int i, nevents;
* When alt-tabing between screens we can get phantom key up messages
* Here we only pass them through it we think we should!
if (g_winKeyState[dwKey] == FALSE && fDown == FALSE) return;
/* Update the keyState map */
g_winKeyState[dwKey] = fDown;
nevents = GetKeyboardEvents(events, g_pwinKeyboard, fDown ? KeyPress : KeyRele
ase, dwKey + MIN_KEYCODE);
for (i = 0; i < nevents; i++)
ErrorF("winSendKeyEvent: dwKey: %d, fDown: %d, nEvents %d\n",
dwKey, fDown, nevents);
Note the call to mieqEnqueue there.
I am not a Windows programmer. Can someone tell me if it's okay for
winWindowProc to block? In particular, could we make it block until the
mieq queue is not full?
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