public: DWORD OpenDevice();

DWORD CloseDevice();

DWORD Play(CWnd *pParentWnd,LPCSTR pFileName);

DWORD Stop(); //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; 　　} 　　

DWORD CWave::CloseDevice() 　　

{ 　　

DWORD dwResult=0; //close if currently open if(m_nDeviceID) { //close the MCI device

dwResult=mciSendCommand(m_nDeviceID,MCI_CLOSE,NULL,NULL); //display error message if failed

if(dwResult) DisplayErrorMsg(dwResult); //set identifier to close state else m_nDeviceID=0; } //return result of MCI operation return dwResult; 　　

} 　　

DWORD CWave::Play(CWnd* pWnd,LPCSTR pFileName) 　　

{

MCI_OPEN_PARMS mciOpenParms; //initialize structure

memset(&mciOpenParms,0,sizeof(MCI_OPEN_PARMS)); //set the WAV file name to be played

mciOpenParms.lpstrElementName=pFileName; //first open the device DWORD

dwResult=mciSendCommand(m_nDeviceID,MCI_OPEN, MCI_OPEN_ELEMENT,(DWORD)(LPVOID)&mciOpenParms); //display error message if failed if(dwResult)

DisplayErrorMsg(dwResult); //if successful,instruct the device to play the WAV file else { //save element indentifier m_nElementID=mciOpenParms.wDeviceID; MCI_PLAY_PARMS mciPlayParms; //set the window that will receive notification message

mciPlayParms.dwCallback=(DWORD)pWnd->m_hWnd; //instruct device to play file

dwResult=mciSendCommand(m_nElementID,MCI_PLAY, MCI_NOTIFY,(DWORD)(LPVOID)&mciPlayParms); //display error and close element if failed if(dwResult) { DisplayErrorMsg(dwResult); Stop(); }

} //return result of MCI operation return dwResult; 　　} 　　

DWORD CWave::Stop() 　　

{ 　　

DWORD dwResult=0; 　　 //close if element is currently open 　　 if(m_nElementID) 　　 { 　　

dwResult=mciSendCommand(m_nElementID,MCI_CLOSE,NULL,NULL); 　　 //display error message if failed 　　

if(dwResult) 　　 DisplayErrorMsg(dwResult); 　　 //set identifier to closed state 　　 else 　

m_nElementID=0; 　　

return dwResult; 　　

} 　　

void CWave::DisplayErrorMsg(DWORD dwError) 　　

{ 　　 //check if there was an error 　　

if(dwError) 　　

{ 　　 //character string that contains error message 　　

char szErrorMsg［MAXERRORLENGTH］;