播放Waveform-Audio文件
以下示例使用 mciSendCommand 函数打开波形音频设备并播放由 lpszWAVEFileName 参数指定的波形音频文件。
// Plays a specified waveform-audio file using MCI_OPEN and MCI_PLAY.
// Returns when playback begins. Returns 0L on success, otherwise
// returns an MCI error code.
DWORD playWAVEFile(HWND hWndNotify, LPSTR lpszWAVEFileName)
{
UINT wDeviceID;
DWORD dwReturn;
MCI_OPEN_PARMS mciOpenParms;
MCI_PLAY_PARMS mciPlayParms;
// Open the device by specifying the device and filename.
// MCI will choose a device capable of playing the specified file.
mciOpenParms.lpstrDeviceType = "waveaudio";
mciOpenParms.lpstrElementName = lpszWAVEFileName;
if (dwReturn = mciSendCommand(0, MCI_OPEN,
MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,
(DWORD)(LPVOID) &mciOpenParms))
{
// Failed to open device. Don't close it; just return error.
return (dwReturn);
}
// The device opened successfully; get the device ID.
wDeviceID = mciOpenParms.wDeviceID;
// Begin playback. The window procedure function for the parent
// window will be notified with an MM_MCINOTIFY message when
// playback is complete. At this time, the window procedure closes
// the device.
mciPlayParms.dwCallback = (DWORD) hWndNotify;
if (dwReturn = mciSendCommand(wDeviceID, MCI_PLAY, MCI_NOTIFY,
(DWORD)(LPVOID) &mciPlayParms))
{
mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
return (dwReturn);
}
return (0L);
}