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用声卡录音后为何跟到MM_WIM_DATA()的响应函数的结束处出错?
出错信息为:
Unhandled exception in Recorder.exe(WDMAUD.DRV): 0xC00000005: Access Violation.
胸闷呀.
Unhandled exception in Recorder.exe(WDMAUD.DRV): 0xC00000005: Access Violation.
胸闷呀.
...全文
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linguanyu315 2004-12-14
楼主,我仔细看了,并且测试了你的OnMM_WIM_DATA(),你把"delete pHdr->lpData;delete pHdr;"去掉,很可能就可以了.至少,在我的机子上可以.
linguanyu315 2004-12-14
对了,我只测试了你关于录音的部分.对于另外的部分,如下,我无法测试.就是说除了下面的.其他部分可以了,但要把"delete pHdr->lpData;delete pHdr;"去掉.
CBuffer buf(pHdr->lpData, pHdr->dwBufferLength);
// if (!recordpaused)
{ //write only if not paused
//Write Data to file
DataFromSoundIn(&buf);
}
CBuffer buf(pHdr->lpData, pHdr->dwBufferLength);
// if (!recordpaused)
{ //write only if not paused
//Write Data to file
DataFromSoundIn(&buf);
}
linguanyu315 2004-12-13
我做录音程序的时候,也做法和楼主类似,在这个OnMM_WIM_DATA()里面使用waveInPrepareHeader(),waveInUnprepareHeader().因为如MSDN所述:This function cleans up the preparation performed by waveInPrepareHeader. The function must be called after the device driver fills a data buffer and returns it to the application. You must call this function before freeing the data buffer.但出现同样问题.我采取的方法如上所述,解决了问题.楼主可以试试.
为什么我不是很清楚.我认为,重要的是You must call this function before freeing the data buffer.
为什么我不是很清楚.我认为,重要的是You must call this function before freeing the data buffer.
everandforever 2004-12-13
楼主的用法本身似乎没错。你最好能确认是哪一句错了
linguanyu315 2004-12-13
对不起,打错了一个字,waveInPrepareHeader(),在打开设备"后"(不是"前")使用一次,就可以了.
linguanyu315 2004-12-13
楼主,waveInUnprepareHeader()这个函数,在关闭设备前使用一次.waveInPrepareHeader(),在打开设备前使用一次.这样就可以了.在OnMM_WIM_DATA()里面,你把他们去掉就应该没有问题了.试试吧,如过还有问题,write mail to me:linguanyu315@163.com
ilovevisio1 2004-12-08
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ilovevisio1 2004-12-08
打开方式:
mmReturn = ::waveInOpen( &m_hRecord, AudioDeviceID, &m_Format,(DWORD) hWndGlobal, NULL, CALLBACK_WINDOW ); //use on message to map.....
函数代码.
void CRecorderDlg::OnMM_WIM_DATA(UINT parm1, LONG parm2)
{
MMRESULT mmReturn = 0;
LPWAVEHDR pHdr = (LPWAVEHDR) parm2;
mmReturn = ::waveInUnprepareHeader(m_hRecord, pHdr, sizeof(WAVEHDR));
if(mmReturn)
{
// waveInErrorMsg(mmReturn, "in OnWIM_DATA()");
return;
}
TRACE("WIM_DATA %4d\n", pHdr->dwBytesRecorded);
// if (recordstate)
{
CBuffer buf(pHdr->lpData, pHdr->dwBufferLength);
// if (!recordpaused)
{ //write only if not paused
//Write Data to file
DataFromSoundIn(&buf);
}
// reuse the buffer:
// prepare it again
mmReturn = ::waveInPrepareHeader(m_hRecord,pHdr, sizeof(WAVEHDR));
if(mmReturn)
{
// waveInErrorMsg(mmReturn, "in OnWIM_DATA()");
}
else // no error
{
// add the input buffer to the queue again
mmReturn = ::waveInAddBuffer(m_hRecord, pHdr, sizeof(WAVEHDR));
// if(mmReturn) waveInErrorMsg(mmReturn, "in OnWIM_DATA()");
// else return; // no error
}
}
// we are closing the waveIn handle,
// all data must be deleted
// this buffer was allocated in Start()
delete pHdr->lpData;
delete pHdr;
m_QueuedBuffers--;
}
mmReturn = ::waveInOpen( &m_hRecord, AudioDeviceID, &m_Format,(DWORD) hWndGlobal, NULL, CALLBACK_WINDOW ); //use on message to map.....
函数代码.
void CRecorderDlg::OnMM_WIM_DATA(UINT parm1, LONG parm2)
{
MMRESULT mmReturn = 0;
LPWAVEHDR pHdr = (LPWAVEHDR) parm2;
mmReturn = ::waveInUnprepareHeader(m_hRecord, pHdr, sizeof(WAVEHDR));
if(mmReturn)
{
// waveInErrorMsg(mmReturn, "in OnWIM_DATA()");
return;
}
TRACE("WIM_DATA %4d\n", pHdr->dwBytesRecorded);
// if (recordstate)
{
CBuffer buf(pHdr->lpData, pHdr->dwBufferLength);
// if (!recordpaused)
{ //write only if not paused
//Write Data to file
DataFromSoundIn(&buf);
}
// reuse the buffer:
// prepare it again
mmReturn = ::waveInPrepareHeader(m_hRecord,pHdr, sizeof(WAVEHDR));
if(mmReturn)
{
// waveInErrorMsg(mmReturn, "in OnWIM_DATA()");
}
else // no error
{
// add the input buffer to the queue again
mmReturn = ::waveInAddBuffer(m_hRecord, pHdr, sizeof(WAVEHDR));
// if(mmReturn) waveInErrorMsg(mmReturn, "in OnWIM_DATA()");
// else return; // no error
}
}
// we are closing the waveIn handle,
// all data must be deleted
// this buffer was allocated in Start()
delete pHdr->lpData;
delete pHdr;
m_QueuedBuffers--;
}
linguanyu315 2004-12-08
能不能看看你MM_WIM_DATA的响应函数的代码? 还有你声卡以什么方式打开的?
