从CodeProject那里找到并且剥离出来的一个Trace Log类

这个类还不错的说,希望看到原文的请到CodeProject去看,原文地址是:

http://www.codeproject.com/debug/logtrace.asp

下面我把源代码放上来.




/**/////////////////////////////////////////////////////////////////////////


// LogTrace.cpp -- Interface for the CLogTrace class


// A class to do debug logging






#ifndef __LOGTRACE_H__


#define __LOGTRACE_H__




class CLogTrace






{


// Construction/Destruction


public:


CLogTrace();


~CLogTrace();






// Attributes


public:


CString m_strAppName;




protected:


BOOL m_bActive;


CString m_strFileName;


BOOL m_bTimeStamp;




// Operations


public:


void WriteLine(LPCTSTR szLine);


void WriteLine(LPCTSTR szFormat, LPCTSTR szAddInfo);


void WriteLine(LPCTSTR szFormat, int nAddInfo);


void ResetFile();


void OnStartup(BOOL bActive, BOOL bTimeStamp);


void SetFileName(LPCTSTR szFileName);






protected:








// Inlines


public:


inline void SetActive(BOOL bSet)






{


m_bActive = bSet;


}


inline CString GetFileName()






{


return m_strFileName;


}


};






#endif // __LOGTRACE_H__




/**/////////////////////////////////////////////////////////////////////////


// LogTrace.cpp -- Implementation of the CLogTrace class






#include "stdafx.h"


#include <afxdisp.h>


#include "LogTrace.h"






/**//**************************************************




How to use CLogTrace




1. Make a static CLogTrace object as a member of the application class




2. Add the following lines to the InitInstance of the program






m_LogTrace.m_strAppName = "MyApp"; // use appropriate name here




m_LogTrace.SetFileName("Log.txt"); // sets the log file name and puts it in the exe path




m_LogTrace.OnStartup(TRUE, TRUE); // activates the log trace




3. Also in InitInstance, add the following line if you want to empty the log file


each time the application starts




m_LogTrace.ResetFile();






4. Any time you want to write to the log file, use the CLogTrace::WriteLine functions


these will write the text along with date and time






*******************************************************/










/**///////////////////////////////////////////////////////


// Construction/Destruction




CLogTrace::CLogTrace()






{


m_bActive = FALSE;


m_bTimeStamp = TRUE;




CString s;


}






CLogTrace::~CLogTrace()






{






}






/**/////////////////////////////////////////////////////////


// CLogTrace operations






void CLogTrace::ResetFile()






{


CStdioFile f;


CFileException fe;


CString s;




if (m_strFileName.IsEmpty()) return;




if (f.Open(m_strFileName, CFile::modeWrite | CFile::modeCreate, &fe) == FALSE)






{


return;


}




f.Close();


}








// bActive tells us if we want the trace to be active or not


// bTimeStamp tells us if we want time stamps on each line


// eliminating the time stamp allows us to use this class for a regular log file


void CLogTrace::OnStartup(BOOL bActive, BOOL bTimeStamp)






{


m_bActive = bActive;


m_bTimeStamp = bTimeStamp;


if (bTimeStamp == FALSE) return;


CString s;




// these ***'s help to indicate when one ru of the program ends and another starts


// because we don't always overwrite the file each time




WriteLine("\n\n******************************************\n\n");


s.Format("%s Log Trace %s\n\n", m_strAppName, COleDateTime::GetCurrentTime().Format());


WriteLine(s);


}








// function to write a line of text to the log file


void CLogTrace::WriteLine(LPCTSTR szLine)






{


CStdioFile f;


CFileException fe;


CString s;




if (m_bActive == FALSE) return;


if (m_strFileName.IsEmpty()) return;




if (f.Open(m_strFileName, CFile::modeWrite | CFile::modeCreate |


CFile::modeNoTruncate, &fe) == FALSE)






{


return;


}




try






{


f.SeekToEnd();


TRACE("LOGGIN %s\n", szLine);


if (m_bTimeStamp)






{


s.Format("%s\t%s\n", COleDateTime::GetCurrentTime().Format(),


szLine);


}


else






{


s.Format("%s\n", szLine);


}


f.WriteString(s);


}


catch (CException* e)






{


e->Delete();


}


f.Close();


}




// function to write a line of text, with an extra string


void CLogTrace::WriteLine(LPCTSTR szFormat, LPCTSTR szAddInfo)






{


if (m_bActive == FALSE) return;


CString s;


s.Format(szFormat, szAddInfo);


WriteLine(s);


}






// funtion to write a line of text with an extra integer


void CLogTrace::WriteLine(LPCTSTR szFormat, int nAddInfo)






{


if (m_bActive == FALSE) return;


CString s;


s.Format(szFormat, nAddInfo);


WriteLine(s);


}






// function to set the log file name. don't pass a fill path!


// just pass something like "log.txt"


// the file will be placed in the same dir as the exe file


void CLogTrace::SetFileName(LPCTSTR szFileName)






{


TCHAR drive[_MAX_PATH], dir[_MAX_PATH], name[_MAX_PATH], ext[_MAX_PATH];




const char *path = _pgmptr ;




_splitpath(path, drive, dir, name, ext);




m_strFileName.Format("%s%s%s", drive, dir, szFileName);




}