请问，对于WAVE文件，直接用WINDOWS API（CreateFile等）与用MMIO（mmioOpen等）有什么区别吗？
麻烦看一下下面两个代码，对于一个WAVEFORMATEX的formatTag为1（PCM）的文件，两者都可以正常播放，为什么当tagFormat为2的时候，第一个可以播放，而第二个却在waveOutOpen()时返回错误：WAVERR_BADFORMAT，还是什么其他地方有问题？调试的时候发现，他们读到的数据都是一样的。
代码一：
*wErr = 0;
if(!(m_hmmio = mmioOpen(lpszFileName, NULL, MMIO_READ | MMIO_ALLOCBUF)))
{
*wErr = 1; // Unable to open file
return FALSE;
}
mmckinfoParent.fccType = mmioFOURCC('W', 'A', 'V', 'E');
if(mmioDescend(m_hmmio, (LPMMCKINFO)&mmckinfoParent, NULL, MMIO_FINDRIFF))
{
*wErr = 2; // File format not surported
return FALSE;
}
mmckinfoSubChunk.ckid = mmioFOURCC('f','m','t',' ');
if(mmioDescend(m_hmmio, &mmckinfoSubChunk, &mmckinfoParent, MMIO_FINDCHUNK))
{
*wErr = 3; // Cannot find fmt chunk
return FALSE;
}
dwFmtSize = mmckinfoSubChunk.cksize;
m_hFormat = LocalAlloc(LMEM_MOVEABLE, LOWORD(dwFmtSize));
if(!m_hFormat)
{
*wErr = 4; // Error when apply memory
return FALSE;
}
lpFormat = (WAVEFORMATEX *)LocalLock(m_hFormat);
if(!lpFormat)
{
*wErr = 4; // Error when apply memory
LocalFree(m_hFormat);
return FALSE;
}
if((unsigned long)mmioRead(m_hmmio, (HPSTR)lpFormat, dwFmtSize) != dwFmtSize)
{
*wErr = 5; // Unable to read format chunk
LocalUnlock(m_hFormat);
LocalFree(m_hFormat);
return FALSE;
}
mmioAscend(m_hmmio, &mmckinfoSubChunk, 0);
mmckinfoSubChunk.ckid = mmioFOURCC('d','a','t','a');
if(mmioDescend(m_hmmio, &mmckinfoSubChunk, &mmckinfoParent, MMIO_FINDCHUNK))
{
*wErr = 6; // Cannot find data chunk
LocalUnlock(m_hFormat);
LocalFree(m_hFormat);
return FALSE;
}
dwDataSize = mmckinfoSubChunk.cksize;
dwDataOffset = mmckinfoSubChunk.dwDataOffset;
if(dwDataSize == 0L)
{
*wErr = 7; // No data in data chunk
LocalUnlock(m_hFormat);
LocalFree(m_hFormat);
return FALSE;
}
lpData = new char[dwDataSize];
// DWORD dwReadSize;
// ReadFile(m_hmmio, lpData, dwDataSize, &dwReadSize, NULL);
if(!lpData)
{
*wErr = 4;
LocalUnlock(m_hFormat);
LocalFree(m_hFormat);
return FALSE;
}
if(mmioSeek(m_hmmio, dwDataOffset, SEEK_SET)<0)
{
LBE8: *wErr = 8; // Fail to read data chunk
LBE8T: delete [dwDataSize]lpData;
LocalUnlock(m_hFormat);
LocalFree(m_hFormat);
return FALSE;
}
if(mmioRead(m_hmmio, (HPSTR)lpData, dwDataSize) != dwDataSize)
{
goto LBE8; return FALSE;
}
if(waveOutGetDevCaps(WAVE_MAPPER, &pwoc, sizeof(WAVEOUTCAPS))!=0)
{
*wErr = 9; goto LBE8T;
}
if(waveOutOpen(&hWaveOut, WAVE_MAPPER, lpFormat, NULL, NULL, CALLBACK_NULL)!=0)
{
*wErr = 9; goto LBE8T; // Device not ready;
}
代码二：
hFile = CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if(hFile == INVALID_HANDLE_VALUE)
return WAVEERR_FILEOPEN;
bSuccess = ReadFile(hFile, &wi, sizeof(wi), &dwBytesRead, NULL);
if(!bSuccess || dwBytesRead != sizeof(wi))
{
CloseHandle(hFile);
return WAVEERR_FILEOPEN;
}
if(wi.wfh.RiffTag != RIFFTAG || wi.wfh.WaveTag != WAVETAG ||
wi.ch.ChunkTag != FMTTAG)
{
CloseHandle(hFile);
return WAVEERR_FORMAT;
}
char *Temp = new char[wi.ch.ChunkSize];
bSuccess = ReadFile(hFile, Temp, wi.ch.ChunkSize, &dwBytesRead, NULL);
if(!bSuccess || (long)dwBytesRead != wi.ch.ChunkSize)
{
CloseHandle(hFile);
return WAVEERR_FILEOPEN;
}
m_wfx = *(WAVEFORMATEX *)Temp;
delete [wi.ch.ChunkSize]Temp;
do{
bSuccess = ReadFile(hFile, &ch, sizeof(ch), &dwBytesRead, NULL);
if(!bSuccess || dwBytesRead != sizeof(ch))
{
CloseHandle(hFile);
return WAVEERR_FILEOPEN;
}
if(ch.ChunkTag == DATATAG)
break;
bSuccess = SetFilePointer(hFile, ch.ChunkSize, NULL, FILE_CURRENT);
}while(bSuccess);
m_dwDataSize = ch.ChunkSize;
m_pData = new char[m_dwDataSize];
if(m_pData == NULL)
{
CloseHandle(hFile);
return WAVEERR_ALLOC;
}
bSuccess = ReadFile(hFile, m_pData, m_dwDataSize, &dwBytesRead, NULL);
CloseHandle(hFile);
if(!bSuccess || m_dwDataSize != dwBytesRead)
return WAVEERR_FILEOPEN;
if(MMSYSERR_NOERROR != waveOutGetDevCaps(WAVE_MAPPER, &m_woc, sizeof(m_woc)))
return WAVEERR_DEVICE;
if(MMSYSERR_NOERROR != waveOutOpen(&m_hwo, WAVE_MAPPER, &m_wfx, NULL, NULL, CALLBACK_NULL))
return WAVEERR_DEVICE;
