播放mp3的源代码。希望有所帮助!   
  //-----------------------------------------------------------------------------   
  //   Purpose:   Get   The   Play   Item's   Status   
  //-----------------------------------------------------------------------------   
  DWORD   WINAPI   getinfo(DWORD   item,DWORD&   m_count)   
  {   
  MCI_STATUS_PARMS   mcistatusparms;   
  mcistatusparms.dwCallback=NULL;//(DWORD)GetSafeHwnd();   
  mcistatusparms.dwItem=item;   
  mcistatusparms.dwReturn=0;   
  mciSendCommand(m_count,MCI_STATUS,MCI_STATUS_ITEM,(DWORD)&mcistatusparms);   
  return   mcistatusparms.dwReturn;   
  }       
  //-----------------------------------------------------------------------------   
  //   Purpose:   Play   Mp3   (Call   It   Via   AfxBeginThread)   
  //   Input     :   pParam   -   Mp3   FileName   
  //   Output   :   UINT   
  //-----------------------------------------------------------------------------   
  UINT   PlayMp3(LPVOID   pParam)   
  {   
  MCI_OPEN_PARMS   mciopenparms;   
  MCI_PLAY_PARMS   mciplayparms;   
  mciopenparms.lpstrElementName=   *((CString*)pParam);   
  mciopenparms.lpstrDeviceType=NULL;   
  mciopenparms.dwCallback=NULL;   
  MCIERROR   e   =   mciSendCommand(0,MCI_OPEN,MCI_DEVTYPE_WAVEFORM_AUDIO,(DWORD)(LPVOID)&mciopenparms);//マ?CIノ雎クキ「ヒヘテ・隝鋧「   
  DWORD   m_count=mciopenparms.wDeviceID;   
  mciplayparms.dwCallback=   NULL;//(DWORD)GetSafeHwnd();   
  DWORD   cdlen=getinfo(MCI_STATUS_LENGTH,m_count);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
  DWORD   cdto=MCI_MAKE_HMS(MCI_HMS_HOUR(cdlen),MCI_HMS_MINUTE(cdlen),MCI_HMS_SECOND(cdlen));       
  mciplayparms.dwFrom=0;   
  mciplayparms.dwTo=cdto;   
  e   =   mciSendCommand(mciopenparms.wDeviceID,MCI_PLAY,MCI_WAIT|MCI_TO|MCI_FROM,(DWORD)(LPVOID)&   mciplayparms);               
          DeleteFile(mciopenparms.lpstrElementName);       
  SAFE_DELETE(pParam);   
  return   0;   
  }       
  //-----------------------------------------------------------------------------   
  //   Purpose:   Play   Mp3   File   
  //   Input     :   sFileName   -   Mp3   File   Name   
  //   Output   :   void   WINAPI   
  //-----------------------------------------------------------------------------   
  void   WINAPI   PlayMp3File(CString   sFileName)   
  {   
  MCI_OPEN_PARMS   mciopenparms;   
  MCI_PLAY_PARMS   mciplayparms;   
  mciopenparms.lpstrElementName=   sFileName;   
  mciopenparms.lpstrDeviceType=NULL;   
  mciopenparms.dwCallback=NULL;   
  MCIERROR   e   =   mciSendCommand(0,MCI_OPEN,MCI_DEVTYPE_WAVEFORM_AUDIO,(DWORD)(LPVOID)&mciopenparms);   
  DWORD   m_count=mciopenparms.wDeviceID;   
  mciplayparms.dwCallback=   NULL;//(DWORD)GetSafeHwnd();   
  DWORD   cdlen=getinfo(MCI_STATUS_LENGTH,m_count);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
  DWORD   cdto=MCI_MAKE_HMS(MCI_HMS_HOUR(cdlen),MCI_HMS_MINUTE(cdlen),MCI_HMS_SECOND(cdlen));       
  mciplayparms.dwFrom=0;   
  mciplayparms.dwTo=cdto;   
  e   =   mciSendCommand(mciopenparms.wDeviceID,MCI_PLAY,MCI_TO|MCI_FROM,(DWORD)(LPVOID)&   mciplayparms);               
  }