播放光碟曲目
[與此頁面相關聯的功能 MCI是舊版功能。 MediaPlayer已取代它。 MediaPlayer 已針對 Windows 10 和 Windows 11 優化。 Microsoft強烈建議新程式代碼盡可能使用 MediaPlayer,而不是 MCI。 Microsoft建議使用舊版 API 的現有程式代碼,盡可能改寫成使用新的 API。]
下列範例會開啟CD音訊裝置、播放由 bTrack 參數指定的曲目,並在播放完成之後關閉裝置。 它會使用 mciSendCommand 函式。
// Plays a specified audio track using MCI_OPEN, MCI_PLAY. Returns as
// soon as playback begins. The window procedure function for the
// specified window will be notified when playback is complete.
// Returns 0L on success; otherwise, returns an MCI error code.
DWORD playCDTrack(HWND hWndNotify, BYTE bTrack)
{
UINT wDeviceID;
DWORD dwReturn;
MCI_OPEN_PARMS mciOpenParms;
MCI_SET_PARMS mciSetParms;
MCI_PLAY_PARMS mciPlayParms;
// Open the CD audio device by specifying the device name.
mciOpenParms.lpstrDeviceType = "cdaudio";
if (dwReturn = mciSendCommand(NULL, MCI_OPEN,
MCI_OPEN_TYPE, (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;
// Set the time format to track/minute/second/frame (TMSF).
mciSetParms.dwTimeFormat = MCI_FORMAT_TMSF;
if (dwReturn = mciSendCommand(wDeviceID, MCI_SET,
MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &mciSetParms))
{
mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
return (dwReturn);
}
// Begin play from the specified track and play to the beginning
// of the next track. The window procedure function for the parent
// window will be notified with an MM_MCINOTIFY message when
// playback is complete. Unless the play command fails, the window
// procedure closes the device.
mciPlayParms.dwFrom = 0L;
mciPlayParms.dwTo = 0L;
mciPlayParms.dwFrom = MCI_MAKE_TMSF(bTrack, 0, 0, 0);
mciPlayParms.dwTo = MCI_MAKE_TMSF(bTrack + 1, 0, 0, 0);
mciPlayParms.dwCallback = (DWORD) hWndNotify;
if (dwReturn = mciSendCommand(wDeviceID, MCI_PLAY,
MCI_FROM | MCI_TO | MCI_NOTIFY,
(DWORD)(LPVOID) &mciPlayParms))
{
mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
return (dwReturn);
}
return (0L);
}
若要指定相對於光碟上曲目的位置,您必須使用 track/minute/second/frame (TMSF) 時間格式。