這個類還不錯的說,希望看到原文的請到CodeProject去看,原文地址是:
http://www.codeproject.com/debug/logtrace.asp下面我把源代碼放上來.
/**/////////////////////////////////////////////////////////////////////////
//??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);
}