偶看新闻91网址你们懂得:使用mciSendCommand播放CD
来源：百度文库 编辑：偶看新闻 时间：2024/04/29 00:27:24
MCI(Media Control Interface，媒体控制接口)向Windows程序提供了在高层次上控制媒体设备接口的能力。程序不必关心具体设备，就可以对激光唱机（CD）、视盘机、波形音频设备、视频播放设备和MIDI设备等媒体设备进行控制。 mciSendCommand（MCIDEVICEID wIDDevice, //设备的ID，在打开设备时不用该参数 UINT uMsg, //命令消息 DWORD fdwCommand, //命令消息的标志 DWORD dwParam //指向包含命令消息参数的结构 ）// //若成功则返回0，否则返回错误码 应用实例：（1）CD的播放1.打开设备时，MCI为不同的多媒体设备打开提供相应的数据结构类型。若不想使用设备中特定的参数数据，则可使用统一的MCI_OPEN_PARMS结构，原型：typedef struct 使用MCI_SET和MCI_STATUS命令可以用来设置和获取设备信息，在用函数mciSendCommand发送命令时，使用相应的MCI_SET_PARMS和MCI_STATUS_PARMS结构。原型：
DWORD dwCallback; // 低字节用于MCI_NOTIFY的窗口句柄
DWORD dwTimeFormat; // 时间格式
DWORD dwAudio; // 输出声道
} MCI_SET_PARMS;
DWORD dwCallback; // 低字节用于MCI_NOTIFY的窗口句柄
DWORD dwReturn; // 要获取的设备信息
DWORD dwItem; // 需要获取的信息项
DWORD dwTrack; // 曲目的长度或曲目号
} MCI_STATUS_PARMS;
OpenParms.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO; int ireturn=0;
ireturn=::mciSendCommand (NULL,
MCI_OPEN,
MCI_WAIT | MCI_OPEN_SHAREABLE|
MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID ,
(DWORD)(LPVOID) &OpenParms); if(ireturn==0)
{ // 获取CD中的歌曲数目，写入ListCtrl中
StatusParms.dwItem = MCI_STATUS_NUMBER_OF_TRACKS;
mciSendCommand (m_wDeviceID,
MCI_STATUS, MCI_STATUS_ITEM,
(DWORD)(LPVOID) &StatusParms);
UINT cdnum=StatusParms.dwReturn;
for(int i=0;i {
CString cdstr;
cdstr.Format("曲目%d",i+1);
m_cdcata.InsertItem(i,cdstr);
}
}
} 2.OPlay(){
MCI_SET_PARMS SetParms;
//// 设置时间格式： Tracks, Minutes, Seconds, & Frames
SetParms.dwTimeFormat = MCI_FORMAT_TMSF;
::mciSendCommand (m_wDeviceID,
MCI_SET,
MCI_WAIT | MCI_SET_TIME_FORMAT,
(DWORD)(LPVOID) &SetParms);
::mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_SEEK_TO_START, NULL);
MCI_PLAY_PARMS PlayParms;
//指定播放起点必须经过MCI_MAKE_TMSF(Track，Minute，Second，Frame)转化
PlayParms.dwFrom=MCI_MAKE_TMSF(m_cdcata.GetSelectionMark();,0,0,0);
::mciSendCommand (m_wDeviceID, MCI_PLAY, MCI_FROM, (DWORD)(LPVOID) &PlayParms);} 3.OnStop() {
::mciSendCommand (m_wDeviceID, MCI_STOP, NULL, NULL);
} 4.OnPause(){ ::mciSendCommand (m_wDeviceID, MCI_PAUSE, 0,NULL));} 注：
使用MCI_STATUS_LENGTH 参数查询CD 及曲目长度，返回值通过调用
MCI_MSF_MINUTE（），
MCI_MSF_SECOND（）
转换为分、秒。
使用MCI_SET和MCI_STATUS命令可以用来设置和获取设备信息，在用函数mciSendCommand发送命令时，使用相应的MCI_SET_PARMS和MCI_STATUS_PARMS结构。原型：
typedef struct {
DWORD dwCallback; // 低字节用于MCI_NOTIFY的窗口句柄
DWORD dwTimeFormat; // 时间格式
DWORD dwAudio; // 输出声道
} MCI_SET_PARMS;
typedef struct {
DWORD dwCallback; // 低字节用于MCI_NOTIFY的窗口句柄
DWORD dwReturn; // 要获取的设备信息
DWORD dwItem; // 需要获取的信息项
DWORD dwTrack; // 曲目的长度或曲目号
} MCI_STATUS_PARMS; OpenParms.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO; int ireturn=0;
ireturn=::mciSendCommand (NULL,
MCI_OPEN,
MCI_WAIT | MCI_OPEN_SHAREABLE|
MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID ,
(DWORD)(LPVOID) &OpenParms); if(ireturn==0)
{ // 获取CD中的歌曲数目，写入ListCtrl中
StatusParms.dwItem = MCI_STATUS_NUMBER_OF_TRACKS;
mciSendCommand (m_wDeviceID,
MCI_STATUS, MCI_STATUS_ITEM,
(DWORD)(LPVOID) &StatusParms);
UINT cdnum=StatusParms.dwReturn;
for(int i=0;i
CString cdstr;
cdstr.Format("曲目%d",i+1);
m_cdcata.InsertItem(i,cdstr);
}
}
} 2.OPlay(){
MCI_SET_PARMS SetParms;
//// 设置时间格式： Tracks, Minutes, Seconds, & Frames
SetParms.dwTimeFormat = MCI_FORMAT_TMSF;
::mciSendCommand (m_wDeviceID,
MCI_SET,
MCI_WAIT | MCI_SET_TIME_FORMAT,
(DWORD)(LPVOID) &SetParms);
::mciSendCommand (m_wDeviceID, MCI_SEEK, MCI_SEEK_TO_START, NULL);
MCI_PLAY_PARMS PlayParms;
//指定播放起点必须经过MCI_MAKE_TMSF(Track，Minute，Second，Frame)转化
PlayParms.dwFrom=MCI_MAKE_TMSF(m_cdcata.GetSelectionMark();,0,0,0);
::mciSendCommand (m_wDeviceID, MCI_PLAY, MCI_FROM, (DWORD)(LPVOID) &PlayParms);} 3.OnStop() {
::mciSendCommand (m_wDeviceID, MCI_STOP, NULL, NULL);
} 4.OnPause(){ ::mciSendCommand (m_wDeviceID, MCI_PAUSE, 0,NULL));} 注：
使用MCI_STATUS_LENGTH 参数查询CD 及曲目长度，返回值通过调用
MCI_MSF_MINUTE（），
MCI_MSF_SECOND（）
转换为分、秒。
//得到CD总长void CCDAudio::GetTotalLength (int *pnMinutes, int *pnSeconds){if (m_bOpened){MCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_LENGTH;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms)){*pnMinutes = -1;*pnSeconds = -1;return;}*pnMinutes = MCI_MSF_MINUTE (StatusParms.dwReturn);*pnSeconds = MCI_MSF_SECOND (StatusParms.dwReturn);return;}*pnMinutes = -1;*pnSeconds = -1;}//得到指定轨道的长度void CCDAudio::GetTrackLength (int nTrack, int *pnMinutes, int *pnSeconds){if (m_bOpened){MCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_LENGTH;StatusParms.dwTrack = (DWORD) nTrack;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM | MCI_TRACK,(DWORD)(LPVOID) &StatusParms)){*pnMinutes = -1;*pnSeconds = -1;return;}*pnMinutes = MCI_MSF_MINUTE (StatusParms.dwReturn);*pnSeconds = MCI_MSF_SECOND (StatusParms.dwReturn);return;}*pnMinutes = -1;*pnSeconds = -1;}------------------------------------------------------
注：
MCI_STATUS_POSITION 参数返回值调用
MCI_TMSF_TRACK(),
MCI_TMSF_MINUTE()，
MCI_TMSF_SECOND()，
MCI_TMSF_FRAME()
才能得到当前的位置的 道、分、秒、帧。
//得到当前轨道号int CCDAudio::GetCurrentTrack (void){if (m_bOpened){// Save the current positionMCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_POSITION;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms))return -1;return MCI_TMSF_TRACK (StatusParms.dwReturn);}return -1;}//得到当前时间（分）int CCDAudio::GetMinutes (void){if (m_bOpened){// Save the current positionMCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_POSITION;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms))return -1;return MCI_TMSF_MINUTE (StatusParms.dwReturn);}return -1;}//得到当前时间（秒）int CCDAudio::GetSeconds (void){if (m_bOpened){// Save the current positionMCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_POSITION;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms))return -1;return MCI_TMSF_SECOND (StatusParms.dwReturn);}return -1;}//得到当前（帧）int CCDAudio::GetFrames (void){if (m_bOpened){// Save the current positionMCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_POSITION;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms))return -1;return MCI_TMSF_FRAME (StatusParms.dwReturn);}return -1;}------------------------------------------------------
//BOOL CCDAudio::IsDriveReady (void){if (m_bOpened){// See if the CD is ready and the drive is closedMCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_STATUS_MODE;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms))return FALSE;if (StatusParms.dwReturn == MCI_MODE_NOT_READY|| StatusParms.dwReturn == MCI_MODE_OPEN)return FALSE;// See if there is media in the driveStatusParms.dwItem = MCI_STATUS_MEDIA_PRESENT;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms))return FALSE;return (BOOL) StatusParms.dwReturn;}return FALSE;}//BOOL CCDAudio::IsAudioTrack (int nTrack){if (m_bOpened){// See if this track is an audio trackMCI_STATUS_PARMS StatusParms;StatusParms.dwItem = MCI_CDA_STATUS_TYPE_TRACK;StatusParms.dwTrack = nTrack;if (::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_STATUS_ITEM | MCI_TRACK,(DWORD)(LPVOID) &StatusParms))return FALSE;if (StatusParms.dwReturn == MCI_CDA_TRACK_AUDIO)return TRUE;}return FALSE;} 注：
跳转的目标必须经过MCI_MAKE_TMSF(Track，Minute，Second，Frame)转化
//BOOL CCDAudio::SeekTo (int nTrack, int nMinute, int nSecond, int nFrame){if (m_bOpened){MCI_SEEK_PARMS SeekParms;SeekParms.dwTo = MCI_MAKE_TMSF (nTrack, nMinute, nSecond, nFrame);if (m_bPlaying && !m_bPaused)::mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, NULL);if (::mciSendCommand (m_wDeviceID, MCI_SEEK,MCI_TO | MCI_WAIT,(DWORD)(LPVOID) &SeekParms))return FALSE;if (m_bPlaying && !m_bPaused)Play ();return TRUE;}return FALSE;}//void CCDAudio::SkipForward (int nSeconds){if (m_bOpened){// Change format to millisecondsMCI_SET_PARMS SetParms;SetParms.dwTimeFormat = MCI_FORMAT_MILLISECONDS;::mciSendCommand (m_wDeviceID, MCI_SET,MCI_WAIT | MCI_SET_TIME_FORMAT,(DWORD)(LPVOID) &SetParms);// Get the current positionMCI_STATUS_PARMS StatusParms;DWORD dwPos;StatusParms.dwItem = MCI_STATUS_POSITION;::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms);dwPos = StatusParms.dwReturn;// Skip forward n millisecondsdwPos += (DWORD) nSeconds * 1000;// Pause & seek toMCI_SEEK_PARMS SeekParms;SeekParms.dwTo = dwPos;if (m_bPlaying && !m_bPaused)::mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, NULL);::mciSendCommand (m_wDeviceID, MCI_SEEK,MCI_TO | MCI_WAIT,(DWORD)(LPVOID) &SeekParms);// Change format back to track, minutes, secondsSetParms.dwTimeFormat = MCI_FORMAT_TMSF;::mciSendCommand (m_wDeviceID, MCI_SET,MCI_WAIT | MCI_SET_TIME_FORMAT,(DWORD)(LPVOID) &SetParms);// Restart the audioif (m_bPlaying && !m_bPaused)Play ();}}//void CCDAudio::SkipBack (int nSeconds){if (m_bOpened){// Change format to millisecondsMCI_SET_PARMS SetParms;SetParms.dwTimeFormat = MCI_FORMAT_MILLISECONDS;::mciSendCommand (m_wDeviceID, MCI_SET,MCI_WAIT | MCI_SET_TIME_FORMAT,(DWORD)(LPVOID) &SetParms);// Get the current positionMCI_STATUS_PARMS StatusParms;DWORD dwPos;StatusParms.dwItem = MCI_STATUS_POSITION;::mciSendCommand (m_wDeviceID, MCI_STATUS,MCI_WAIT | MCI_STATUS_ITEM,(DWORD)(LPVOID) &StatusParms);dwPos = StatusParms.dwReturn;// Skip forward n millisecondsdwPos -= (DWORD) nSeconds * 1000;// Pause & seek toMCI_SEEK_PARMS SeekParms;SeekParms.dwTo = dwPos;if (m_bPlaying && !m_bPaused)::mciSendCommand (m_wDeviceID, MCI_PAUSE, 0, NULL);::mciSendCommand (m_wDeviceID, MCI_SEEK,MCI_TO | MCI_WAIT,(DWORD)(LPVOID) &SeekParms);// Change format back to track, minutes, secondsSetParms.dwTimeFormat = MCI_FORMAT_TMSF;::mciSendCommand (m_wDeviceID, MCI_SET,MCI_WAIT | MCI_SET_TIME_FORMAT,(DWORD)(LPVOID) &SetParms);// Restart the audioif (m_bPlaying && !m_bPaused)Play ();}}//OpenDrive (void){::mciSendCommand (m_wDeviceID, MCI_SET, MCI_SET_DOOR_OPEN, NULL);}}
//CloseDrive (void){ ::mciSendCommand (m_wDeviceID, MCI_SET, MCI_SET_DOOR_CLOSED, NULL);}
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