[wdmaudiodev] Re: waveInAddBuffer and Win2k, XP
- From: Paal Tamas <paal_to@xxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 29 Jul 2004 10:12:04 +0200 (CEST)
Thank you Harry!
I've made the necessary changes (changed the device handling
mechanism from callback function to message handling in a new
thread), and now it works fine under Win98 and XP, but under Win2000
I still have the same exception then before.
Please advise.
Tom
Harry Graham <harry_graham@xxxxxxxxxx> írta:
> Check the "waveInProc" doc in the SDK:
>
> "Applications should not call any system-defined functions from inside
a
> callback function, except for EnterCriticalSection, LeaveCriticalSection,
> midiOutLongMsg, midiOutShortMsg, OutputDebugString, PostMessage,
> PostThreadMessage, SetEvent, timeGetSystemTime, timeGetTime,
timeKillEvent,
> and timeSetEvent. Calling other wave functions will cause deadlock."
>
> You cannot call waveInAddBuffer from the callback.
>
> Harry
>
>
> -----Original Message-----
> From: Paal Tamas [mailto:paal_to@xxxxxxxxxxx]
> Sent: Wednesday, July 28, 2004 6:31 AM
> To: wdmaudiodev@xxxxxxxxxxxxx
> Subject: [wdmaudiodev] waveInAddBuffer and Win2k, XP
>
>
>
> Hi,
>
> I've developed an application that reads data from my USB
soundcard,
> and writes to the same card at the same time. The app works fine
> under Win98SE.
> When I tried it under win2K, it raised an exception (access violation in
> wdmaud.drv). After a short debugging, I realized, that the
> waveInAddBuffer() API function call raises that exception.
>
> Have you ever faced this kind of problem? What am I missing?
>
> The application simply opens the input and the output with the
> respective waveInOpen() and waveOutOpen() functions. I use
Callback
> functions to handle the data. I use only standard windows APIs.
> The waveInAddBuffer() function is called inside the callback function
> (under the WIM_OPEN section).
>
> Thank you for your help in advance.
> Tom
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