mciSendCommand 音频视频播放命令函数

//打开设备
//typedef struct {
// DWORD dwCallback;        //指定一个窗口句柄
// MCIDEVICEID wDeviceID;   //为成功打开的文件返回　设备标识符. 
// LPCSTR lpstrDeviceType;  //设备类型的名字或常量标识. (设备名可以从注册表或者 SYSTEM.INI 文件中获得) 
// LPCSTR lpstrElementName; //设备元素 (通常是打开的文件全路径). 
// LPCSTR lpstrAlias//可选别名
// DWORD dwBufferSeconds;
//} MCI_WAVE_OPEN_PARMS;




//播放文件
//typedef struct {
// DWORD dwCallback;//指定一个窗口句柄
// DWORD dwFrom;//设置播放起始点
// DWORD dwTo;//设置播放结束点
//} MCI_PLAY_PARMS;


//查询信息
//typedef struct {
// DWORD dwCallback;
// DWORD dwReturn;//返回的信息内容
// DWORD dwItem;//请求查询的内容
// DWORD dwTrack;//轨道的长度或数目
//} MCI_STATUS_PARMS;


 /*
 * 函数名称：MCI_Open
 * 函数介绍：用mci命令打开文件
 * 输入参数：CString strPath, 文件的路径
 * 输出参数：无
 * 返回值 ：mci命令的错误信息
 */

DWORD dlg_login::MCIOpen(const CString &strPath){//打开MCI设备MCI_OPEN_PARMS mciOP;DWORD opReturn;MCIDEVICEID wIDDevioce;  //保存设备IDmciOP.lpstrDeviceType = NULL;mciOP.lpstrElementName = strPath;  //设置打开的文件的名称opReturn = mciSendCommand(NULL, MCI_OPEN, MCI_OPEN_ELEMENT, (DWORD)(LPVOID)&mciOP);if (opReturn == 0){wIDDevioce = mciOP.wDeviceID;//播放设备IdwDevioceId = mciOP.wDeviceID;//设置设备信息MCI_SET_PARMS mciSet;mciSet.dwTimeFormat = MCI_FORMAT_MILLISECONDS; //设置时间单位为毫秒mciSendCommand(wDevioceId, MCI_SET, MCI_SET_TIME_FORMAT, (DWORD)(LPVOID)&mciSet);//设置当前播放位置跳转60秒MCISeek(100);//音频播放MCIPlay();MCI_STATUS_PARMS mciStatus;mciStatus.dwItem = MCI_STATUS_TIME_FORMAT;DWORD sta2Return = mciSendCommand(wIDDevioce, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&mciStatus);DWORD music_timestyle = mciStatus.dwReturn; //获得当前的时间格式mciStatus.dwItem = MCI_STATUS_MODE;DWORD sta3Return = mciSendCommand(wIDDevioce, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&mciStatus);DWORD music_playstyle = mciStatus.dwReturn; //获得当前播放工作模式 播放 526  暂停525 }elsewIDDevioce = NULL;return opReturn;}

DWORD dlg_login::MCIPlay(){    MCI_PLAY_PARMS mciPP;    DWORD opReturn;    opReturn = mciSendCommand(wDevioceId, MCI_PLAY, MCI_NOTIFY, (DWORD)&mciPP);    return opReturn;}

DWORD dlg_login::MCIStatus_music_length(){    MCI_STATUS_PARMS mciStatus;    mciStatus.dwItem = MCI_STATUS_LENGTH;    DWORD staReturn = mciSendCommand(wDevioceId, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&mciStatus);    DWORD music_alltime = mciStatus.dwReturn / 1000; //音乐总时间    return music_alltime;}

DWORD dlg_login::MCIStatus_music_pos(){    MCI_STATUS_PARMS mciStatus;    mciStatus.dwItem = MCI_STATUS_POSITION;    DWORD sta1Return = mciSendCommand(wDevioceId, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&mciStatus);    DWORD music_timeing = mciStatus.dwReturn / 1000; //音乐当前播放时间    return music_timeing;}

//从制定位置开始播放void send_music_from_pos(){    MCI_STATUS_PARMS mciStatus;    mciStatus.dwItem = MCI_STATUS_POSITION;    DWORD sta1Return = mciSendCommand(wDevioceId, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&mciStatus);    DWORD music_timeing = mciStatus.dwReturn / 1000; //音乐当前播放时间    MCI_PLAY_PARMS PlayParms;    PlayParms.dwFrom = music_timeing; // 指定从什么地方（时间）播放    DWORD ret1 = mciSendCommand(wDevioceId, MCI_PLAY, MCI_NOTIFY, (DWORD)(LPVOID)&PlayParms);}

//关闭指定设备

void close_mci(){    DWORD retclose=mciSendCommand(wDevioceId, MCI_CLOSE, NULL, NULL);}

//调节音量DWORD dlg_login::MCISetVolume(DWORD dwVol){MCI_DGV_SETAUDIO_PARMSmciSetAudioPara;mciSetAudioPara.dwCallback= NULL;mciSetAudioPara.dwItem = MCI_DGV_SETAUDIO_VOLUME;mciSetAudioPara.dwValue = dwVol; //此处就是音量大小 (0--1000)DWORD dwReturn = mciSendCommand(wDevioceId, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE |  MCI_DGV_SETAUDIO_ITEM, (DWORD)(LPVOID)&mciSetAudioPara);return dwReturn;}