VC：大型WAV文件的播放(2)

//Implementation
protected:
void DisplayErrorMsg(DWORD dwError);

//Members
protected:
MCIDEVICEID m_nDeviceID;
MCIDEVICEID m_nElementID;
　　};

　　//Cwave类的实现代码，Cwave.cpp

　　#include
　　#include "cwave.h"

　　CWave::CWave()
　　{
　　 m_nDeviceID=0;
　　 m_nElementID=0;
　　}

　　CWave::~CWave()
　　{
　　 if(m_nElementID)
　　 Stop();
　　 if(m_nDeviceID)
　　 CloseDevice();
　　}

　　DWORD CWave::OpenDevice()
　　{
　　 DWORD dwResult=0;
　　 if (m_nDeviceID)

MCI_OPEN_PARMS mciOpenParms;
　　 mciOpenParms.lpstrDeviceType=(LPSTR)MCI_DEVTYPE_WAVEFORM_AUDIO;
//open the wave device
　　dwResult=mciSendCommand(NULL,MCI_OPEN,
MCI_OPEN_TYPE|MCI_OPEN_TYPE_ID|MCI_WAIT,
(DWORD)(LPVOID)&mciOpenParms);
//save device identifier,will use eith other MCI commands
m_nDeviceID=mciOpenParms.wDeviceID;
//display error message if failed
if(dwResult)
DisplayErrorMsg(dwResult);
}
//return result of MCI operation
return dwResult;
　　}