!m_dwSize){
m_pData = (LPBYTE) pdw;
m_dwSize = dwLength;
if (m_pFormat)
return TRUE;
}
break;
}
pdw = (DWORD *)((BYTE *) pdw +
((dwLength + 1) &~ 1));
}
file://未找到，返回FALSE
return FALSE;
}
3. 创建声音缓冲区
DSBUFFERDESC BufferDesc;
memset (&BufferDesc, 0, sizeof (BufferDesc));
BufferDesc.lpwfxFormat = (LPWAVEFORMATEX) m_pFormat;
BufferDesc.dwSize = sizeof (DSBUFFERDESC);
BufferDesc.dwBufferBytes = m_dwSize;
BufferDesc.dwFlags = 0;
file://头文件中声明m_pDSoundBuffer，类
型：LPDIRECTSOUNDBUFFER
if (pDSoundObject->CreateSoundBuffer
(&BufferDesc, &m_pDSoundBuffer, 0) != DS_OK)
return FALSE;
4. 载入声音数据
BOOL CDirectWave::LoadData (void){
LPVOID lpPtr1, lpPtr2;
DWORD dwLen1, dwLen2;
HRESULT hResult;
TryLoad:
hResult = m_pDSoundBuffer- >Lock
(0, m_dwSize, &lpPtr1, &dwLen1, &lpPtr2, &dwLen2, 0);
if (hResult == DS_OK){
memcpy (lpPtr1, m_pData, dwLen1);
if (lpPtr2)
memcpy (lpPtr2, m_pData + dwLen1, dwLen2);
m_pDSoundBuffer- >Unlock
(lpPtr1, dwLen1, lpPtr2, dwLen2);
return TRUE;
}
else if (hResult == DSERR_BUFFERLOST){
hResult = m_pDSoundBuffer- >Restore ();
if (hResult == DS_OK)
goto TryLoad;
}
return FALSE;
}
5. 播放及停止
void CDirectWave::Play (BOOL bLoop){
DWORD dwFlags = 0;
file://dwFlags= DSBPLAY_LOOPING可实现循环播放
TryPlay:
if (m_pDSoundBuffer- >
Play (0, 0, dwFlags) == DSERR_BUFFERLOST){
if (LoadData ())//数据丢失，重新装载
goto TryPlay;
}
}
void CDirectWave::Stop (void){
m_pDSoundBuffer- >Stop ();
}
6. 关闭。释放内存块，声音缓冲区。
DirectSound需要用到mmsystem.h，dsound.h两个头文件。
……
