VC播放音频文件

最新推荐文章于 2020-06-27 17:27:34 发布

jyc1228

最新推荐文章于 2020-06-27 17:27:34 发布

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分类专栏：编程文章标签： null 音乐

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本文介绍了一个使用VC++实现音频播放的类CPlayWave，通过MCI接口来打开、播放和停止音频文件。在项目设置中需要链接多媒体库winmm.lib，并提供了示例代码展示如何在窗口中调用播放功能。

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1、所使用的类，如下：

/
//播放音乐类
/
class CPlayWave
{
protected:
  MCIDEVICEID m_DeviceID;
public:
  MCIDEVICEID m_ElementID;
public:
  CPlayWave()
  {
   m_DeviceID = 0;
   m_ElementID = 0;
   InitDevice();
  }
  ~CPlayWave()
  {
   if(m_ElementID)
    Stop();
   if(m_DeviceID)
    TerminalDevice();
  }
  DWORD InitDevice() //初始化设备
  {
   DWORD dwResult = 0;
   if (m_DeviceID == 0)
   {
    MCI_OPEN_PARMS mciInitParms;
    mciInitParms.lpstrDeviceType=(LPSTR)MCI_DEVTYPE_WAVEFORM_AUDIO;
    dwResult = mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_TYPE|MCI_OPEN_TYPE_ID|MCI_WAIT,
           (DWORD)(LPVOID)&mciInitParms);
    m_DeviceID = mciInitParms.wDeviceID;
   }
   return dwResult;
  }
  DWORD TerminalDevice()
  {
   DWORD dwResult = 0;
   if (m_DeviceID)
   {
    dwResult = mciSendCommand(m_DeviceID,MCI_CLOSE,NULL,NULL);
   }
   m_DeviceID = 0;
   return dwResult;
  }
  DWORD Play(HWND hWnd,LPCSTR pFileName)
  {
   MCI_OPEN_PARMS mciOpenParms;
   memset(&mciOpenParms,0,sizeof(MCI_OPEN_PARMS));
   mciOpenParms.lpstrElementName=pFileName;
   DWORD dwResult = 0;
   dwResult = mciSendCommand(m_DeviceID,MCI_OPEN,MCI_OPEN_ELEMENT,
          (DWORD)(LPVOID)&mciOpenParms);
   if(!dwResult)
   {
    m_ElementID=mciOpenParms.wDeviceID;
    MCI_PLAY_PARMS mciPlayParms;
    mciPlayParms.dwCallback=(DWORD)hWnd;
    dwResult=mciSendCommand(m_ElementID,MCI_PLAY,
     MCI_NOTIFY,(DWORD)(LPVOID)&mciPlayParms);
   }
   return dwResult;
  }
  DWORD Stop()
  {
   DWORD dwResult=0;
   if(m_ElementID)
   {
    dwResult=mciSendCommand(m_ElementID,MCI_CLOSE,NULL,NULL);
    m_ElementID=0;
   }
   return dwResult;
  }
};
///