www.pudn.com > dllDSPlayer1.rar > dllDSPlayer.cpp

// dllDSPlayer.cpp : Defines the initialization routines for the DLL. 
// 
 
#include "stdafx.h" 
#include "dllDSPlayer.h" 
#include  
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
#define HW_CD_MEDIA_ALIAS "hwCDMediaAlias" 
// 
//	Note! 
// 
//		If this DLL is dynamically linked against the MFC 
//		DLLs, any functions exported from this DLL which 
//		call into MFC must have the AFX_MANAGE_STATE macro 
//		added at the very beginning of the function. 
// 
//		For example: 
// 
//		extern "C" BOOL PASCAL EXPORT ExportedFunction() 
//		{ 
//			AFX_MANAGE_STATE(AfxGetStaticModuleState()); 
//			// normal function body here 
//		} 
// 
//		It is very important that this macro appear in each 
//		function, prior to any calls into MFC.  This means that 
//		it must appear as the first statement within the  
//		function, even before any object variable declarations 
//		as their constructors may generate calls into the MFC 
//		DLL. 
// 
//		Please see MFC Technical Notes 33 and 58 for additional 
//		details. 
// 
 
///////////////////////////////////////////////////////////////////////////// 
// CDllDSPlayerApp 
 
BEGIN_MESSAGE_MAP(CDllDSPlayerApp, CWinApp) 
	//{{AFX_MSG_MAP(CDllDSPlayerApp) 
		// NOTE - the ClassWizard will add and remove mapping macros here. 
		//    DO NOT EDIT what you see in these blocks of generated code! 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CDllDSPlayerApp construction 
 
CDllDSPlayerApp::CDllDSPlayerApp() 
{ 
	// TODO: add construction code here, 
	// Place all significant initialization in InitInstance 
} 
 
///////////////////////////////////////////////////////////////////////////// 
// The one and only CDllDSPlayerApp object 
 
CDllDSPlayerApp theApp; 
 
int CDllDSPlayerApp::ExitInstance()  
{ 
	CoUninitialize(); 
	return CWinApp::ExitInstance(); 
} 
 
BOOL CDllDSPlayerApp::InitInstance()  
{ 
	CoInitialize(NULL); 
	return CWinApp::InitInstance(); 
} 
 
void DispatchMciError ( MCIERROR mciError, LPCTSTR lpszCmd ) 
{ 
	if ( mciError )		//get error 
	{ 
		char chError[100]; 
		mciGetErrorString ( mciError,chError,lstrlen(chError) ); 
		#ifdef _DEBUG 
		CString csLastError; 
		csLastError.Format ( "%s : %s", lpszCmd, chError ); 
		AfxMessageBox ( csLastError ); 
		#endif 
	} 
} 
 
BOOL hwMciSendString ( 
		LPCTSTR lpszCommand,   
		LPTSTR lpszReturnString,   
		UINT cchReturn,        
		HWND hwndCallback 
	) 
{ 
	if ( !lpszCommand ) return FALSE; 
	MCIERROR mciError = ::mciSendString ( lpszCommand, lpszReturnString, cchReturn, hwndCallback ); 
//	DbgLog ( L_DEBUG, "mciSendString : %s", lpszCommand ); 
	if ( mciError ) 
	{ 
		DispatchMciError ( mciError, lpszCommand ); 
		return FALSE; 
	} 
 
	return TRUE; 
} 
 
BOOL hwMciSendCommand ( 
		MCIDEVICEID IDDevice,   
		UINT uMsg,              
		DWORD fdwCommand,       
		DWORD dwParam           
	) 
{ 
	MCIERROR mciError = ::mciSendCommand ( IDDevice, uMsg, fdwCommand, dwParam ); 
	if ( mciError ) 
	{ 
		CString csCmd; 
		csCmd.Format ( "Command <%d>", fdwCommand ); 
		DispatchMciError ( mciError, csCmd ); 
		return FALSE; 
	} 
 
	return TRUE; 
} 
 
// 
// 获取 CD-ROM 驱动器符号，以'\t'分隔。如：E:\tF:\tG:\t 
// return : ----------------------------------------------------------------------------- 
//		>0	-	找到多少个CD-ROM驱动器 
//		-1	-	失败 
// 
int hwprGetCDromDriver ( OUT CString &csCDROMDriver ) 
{ 
	int nCount = 0; 
 
	for ( int nLoop = 'A' ; nLoop <= 'Z'; nLoop ++ ) 
	{ 
		CString csRoot; 
		csRoot.Format ( "%c:", nLoop ); 
 
		if ( GetDriveType(csRoot) == DRIVE_CDROM ) 
		{ 
			csCDROMDriver += csRoot; 
			csCDROMDriver += "\t"; 
			nCount ++; 
		} 
	} 
 
	return nCount; 
} 
 
BOOL hwMciClose ( MCIDEVICEID &wDeviceID ) 
{ 
	if ( wDeviceID == (MCIDEVICEID)0 ) 
		return TRUE; 
	CString csMciCommand; 
	csMciCommand.Format ( "close %s", HW_CD_MEDIA_ALIAS ); 
	if ( !hwMciSendString ( csMciCommand, NULL, 0, NULL ) ) 
		return FALSE; 
	wDeviceID = 0; 
 
	return TRUE; 
} 
 
BOOL CheckCDValidity ( MCIDEVICEID &wDeviceID ) 
{ 
	if ( wDeviceID == 0 ) 
		return -1; 
	MCI_STATUS_PARMS	mciStatusParms; 
	mciStatusParms.dwItem = MCI_CDA_STATUS_TYPE_TRACK; 
	mciStatusParms.dwTrack = 1; 
    if ( !hwMciSendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_TRACK | MCI_WAIT, (DWORD) (LPVOID) &mciStatusParms) ) 
		return FALSE; 
	if ( mciStatusParms.dwReturn != MCI_CDA_TRACK_AUDIO ) 
		return FALSE; 
 
	return TRUE; 
} 
 
int GetAudioDiskInfo ( MCIDEVICEID &wDeviceID ) 
{ 
	if ( wDeviceID == 0 ) 
		return -1; 
	MCI_STATUS_PARMS mciStatusParms; 
	mciStatusParms.dwItem = MCI_STATUS_READY; 
    if ( !hwMciSendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_WAIT, (DWORD) (LPVOID) &mciStatusParms) ) 
	{ 
		goto failed; 
	} 
	if ( !mciStatusParms.dwReturn ) 
	{ 
		goto failed; 
	} 
 
	mciStatusParms.dwItem = MCI_STATUS_NUMBER_OF_TRACKS; 
    if ( !hwMciSendCommand ( wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_WAIT, (DWORD) (LPVOID) &mciStatusParms ) ) 
	{ 
		goto failed; 
	} 
 
	if ( mciStatusParms.dwReturn < 1 ) 
	{ 
		goto failed; 
	} 
	if ( !CheckCDValidity ( wDeviceID ) ) goto failed; 
	return (int)mciStatusParms.dwReturn; 
 
	return TRUE; 
 
failed: 
	hwMciClose ( wDeviceID ); 
	return -1; 
 
} 
// 
// 获取CD的轨道数，失败时返回-1 
// 
int GetCDTrackNum ( LPCTSTR lpszCDROM ) 
{ 
	if ( !(lpszCDROM && strlen(lpszCDROM) == DRIVER_ROOT_LENGTH && lpszCDROM[1] == ':') ) 
		return -1; 
	MCIDEVICEID wDeviceID = -1; 
	MCI_OPEN_PARMS	mciOpenParms; 
    MCI_SET_PARMS	mciSetParms; 
	mciOpenParms.lpstrDeviceType = "cdaudio"; 
	mciOpenParms.lpstrElementName = lpszCDROM; 
	mciOpenParms.lpstrAlias = HW_CD_MEDIA_ALIAS; 
	if ( !hwMciSendCommand ( NULL, MCI_OPEN, MCI_OPEN_ELEMENT | MCI_OPEN_ALIAS | MCI_OPEN_TYPE, (DWORD) (LPVOID) &mciOpenParms ) ) 
	{ 
		return -1; 
	} 
	wDeviceID = mciOpenParms.wDeviceID; 
 
	// Set the time format to track/minute/second/frame (TMSF). 
    mciSetParms.dwTimeFormat = MCI_FORMAT_TMSF; 
    if ( !hwMciSendCommand ( wDeviceID, MCI_SET, MCI_SET_TIME_FORMAT, (DWORD)(LPVOID) &mciSetParms ) ) 
    { 
		hwMciClose ( wDeviceID ); 
		return -1; 
	} 
 
	int nTrackNum = GetAudioDiskInfo ( wDeviceID ); 
	hwMciClose ( wDeviceID ); 
	return nTrackNum; 
}