bool CDAudio::Play(int no)
{
if (!IsOpen)
return false;
Stop();
PlayTrack = no;
no++; // 这里是以MixedCD为基准，所以播放1首乐曲
// 检查乐曲长度
// 设定只播放此范围
TCHAR request[64];
_stprintf(request, _T("length track %d"), no);
TCHAR result[128];
if (!MciStatus(request, result, sizeof(result)))
return false;
_stprintf(request, _T("from %d:00:00:00 to %d:%s"), no, no, result);
if (!MciPlay(request))
return false;
return true;
}
bool CWaveOut::Play(LPCTSTR name)
{
Stop();
if (!MciOpen(_T("waveaudio"), name))
return false;
if (!MciPlay(_T("")))
return false;
playing = true;
return true;
}
void CMidi::PlayFile()
{
DWORD dwReturn;
MCI_OPEN_PARMS mciOpenParms;
char mciErrorString[MCI_ERROR_LENGTH];
UINT mciErrorLen;
BOOL KnownError = FALSE;
Close();
mciOpenParms.lpstrDeviceType = "sequencer";
mciOpenParms.lpstrElementName = LPCSTR(m_sMidiFile);
if (dwReturn = mciSendCommand(NULL, MCI_OPEN,
MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,
(DWORD)(LPVOID) &mciOpenParms))
{
mciErrorLen = MCI_ERROR_LENGTH;
KnownError = mciGetErrorString(dwReturn, mciErrorString, mciErrorLen);
TRACE("Couldn't Open Midi Device in constructor\n");
if (KnownError)
TRACE("MCI ERROR : %s\n", mciErrorString);
else
TRACE("MCI ERROR : Unknown Error (%x)!!!!! \n",dwReturn);
// Failed to open device. Don't close it; just return error.
m_bMidiInitialized = FALSE;
return;
}
// The device opened successfully; get the device ID.
m_uMCIDeviceID = mciOpenParms.wDeviceID;
m_bMidiInitialized = TRUE;
MciPlay();
}
LRESULT CMidi::CallBack(WPARAM wFlags,LPARAM lDevID)
{
if ((wFlags & MCI_NOTIFY_SUCCESSFUL) && (UINT)lDevID == m_uMCIDeviceID)
MciPlay();
return 0;
}
void CMidi::UnMute()
{
m_bMute=FALSE;
MciPlay();
}