www.pudn.com > 1littlebox.rar > Wave.cpp

// Wave.cpp : implementation file 
// 
 
#include "stdafx.h" 
#include "Wave.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CWave 
 
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;  
 
		dwResult=mciSendCommand(NULL,MCI_OPEN,  
			MCI_OPEN_TYPE|MCI_OPEN_TYPE_ID|MCI_WAIT,  
			(DWORD)(LPVOID)&mciOpenParms);  
 
		m_nDeviceID=mciOpenParms.wDeviceID;  
 
		if(dwResult)  
			DisplayErrorMsg(dwResult);  
	}  
	return dwResult;  
}  
 
DWORD CWave::CloseDevice()  
{  
	DWORD dwResult=0;  
 
	if(m_nDeviceID)  
	{ 
		dwResult=mciSendCommand(m_nDeviceID,MCI_CLOSE,NULL,NULL);  
 
		if(dwResult)  
			DisplayErrorMsg(dwResult); 
		else 
			m_nDeviceID=0;  
	}  
	return dwResult;  
}  
 
DWORD CWave::Play(CWnd* pWnd,LPCSTR pFileName)  
{  
	MCI_OPEN_PARMS mciOpenParms;  
	memset(&mciOpenParms,0,sizeof(MCI_OPEN_PARMS));  
 
	mciOpenParms.lpstrElementName=pFileName;  
 
	DWORD dwResult=mciSendCommand(m_nDeviceID,MCI_OPEN,  
		MCI_OPEN_ELEMENT,(DWORD)(LPVOID)&mciOpenParms);  
 
	if(dwResult)  
		DisplayErrorMsg(dwResult); 
	else 
	{ 
		m_nElementID=mciOpenParms.wDeviceID;  
		MCI_PLAY_PARMS mciPlayParms;  
		mciPlayParms.dwCallback=(DWORD)pWnd->GetSafeHwnd(); 
		dwResult=mciSendCommand(m_nElementID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&mciPlayParms);  
 
		if(dwResult)  
		{  
			DisplayErrorMsg(dwResult);  
			Stop(); 
		}  
	} 
	return dwResult;  
}  
 
DWORD CWave::Stop()  
{ 
	DWORD dwResult=0; 
 
	if(m_nElementID)  
	{  
		dwResult=mciSendCommand(m_nElementID,MCI_CLOSE,NULL,NULL);  
 
		if(dwResult)  
			DisplayErrorMsg(dwResult);   
		else  
			m_nElementID=0;  
	}  
	return dwResult;  
}  
 
void CWave::DisplayErrorMsg(DWORD dwError)  
{  
	if(dwError)  
	{ 
		char szErrorMsg[MAXERRORLENGTH];  
 
		if(!mciGetErrorString(dwError,szErrorMsg,sizeof(szErrorMsg)))  
			strcpy(szErrorMsg,"Unknown Error");  
		AfxMessageBox(szErrorMsg);  
	}  
}