C++的一个日志类，和log4cplus很像

filelogs.h

#ifndef H_FILELOGS_H
#define H_FILELOGS_H

#include "stdlib.h"
#include "stdio.h"
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>

#define  MAX_FILE_LEN   5242880  //5M
#define  MAX_PATH_LEN   300
#define  RTN_FAIL	-1
#define  RTN_SUCCESS 0

#define WriteLog(Msg)	WriteMsgLog(__FILE__,__LINE__,Msg)

class CFileLogs
{
public:
	CFileLogs();
	virtual ~CFileLogs();
	bool IsOpen();
	int init(int iLogLevel,const char *pcDebugLogFileName);
	bool OpenFile(char *);
	bool OpenNewOutputFile(char *);
	bool GetLock();
	int WriteMsgLog(const char *,int,const char *);
	int WriteOutputMsg(const char *);

public:
	char m_FileName[MAX_PATH_LEN + FILENAME_MAX + 1];
	int m_LogLevel;
private:
	bool m_lock;
	FILE *m_file;

private:
	bool CheckFile();
	void GetTimeStr(char *);
};

#endif

filelogs.cpp

// filelogs.cpp: implementation of the CFileLogs class.
//
//////////////////////////////////////////////////////////////////////
#include "filelogs.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CFileLogs::CFileLogs()
{
	m_lock = false;
	m_file = NULL;
}

CFileLogs::~CFileLogs()
{
	if(m_file != NULL)
		fclose(m_file);
}

//////////////////////////////////////////////////////////////////////
// public method
//////////////////////////////////////////////////////////////////////
bool CFileLogs::GetLock()
{
	if(m_lock == true)
		return false;
	m_lock = true;
	return true;
}

bool CFileLogs::IsOpen()
{
	if(m_file != NULL)
		return true;
	else
		return false;
}
int CFileLogs::init(int iLogLevel,const char *pcDebugLogFileName)
{
	this->m_LogLevel = iLogLevel;
	//if log level less than 1 , then don't open log file
	if (this->m_LogLevel > 0) {
		if (pcDebugLogFileName == NULL) {
			return RTN_FAIL;
		}else {
			strcpy(this->m_FileName, pcDebugLogFileName);
			//this->m_DebugLogFileName = strDuplicate(pcDebugLogFileName);
		}
	}
	FILE *logFile=NULL;
	if (this->m_LogLevel >= 3) {
		logFile = fopen(this->m_FileName,(char *)"a+");
		if (logFile == NULL) {
			printf("Cannot open file %s to write!\n", this->m_FileName);
			return RTN_FAIL;
		}
		fclose(logFile);
	}

	return RTN_SUCCESS;
}
bool CFileLogs::OpenFile(char *filePathAndName)
{
	if(filePathAndName == NULL)
		return false;
	sprintf(m_FileName, filePathAndName);
	if((m_file = fopen(m_FileName, "a")) == NULL)
		return  false;
	return true;
}

bool CFileLogs::OpenNewOutputFile(char *filePathAndName)
{
	if(filePathAndName == NULL)
		return false;
	if( IsOpen() )
		fclose(m_file);
	sprintf(m_FileName, filePathAndName);
	if((m_file = fopen(m_FileName, "a")) == NULL)
		return false;
	return true;
}

int CFileLogs::WriteMsgLog(const char *pcsrcfile,int line,const char *strMsg)
{
	char buf[100];

	CheckFile();
	if(m_file == NULL)
		m_file = fopen(m_FileName, "a");
	if(m_file != NULL && strMsg != NULL) {
		GetTimeStr(buf);
		fprintf(m_file, "[%s]line[%d][%s] %s\n",pcsrcfile,line,buf,strMsg);//pcsrcfile
		fflush( m_file );
   	}
	else {
		return 0;
	}
	m_lock = false;
	return  1;
}

int CFileLogs::WriteOutputMsg(const char *strMsg)
{
	if (m_file == NULL)
		m_file = fopen(m_FileName, "a");
	if (m_file != NULL && strMsg != NULL) {
		fprintf(m_file, "%s\n",strMsg);
		fflush( m_file );
   	}
	else {
		return 0;
	}
	m_lock = false;
	return 1;
}

bool CFileLogs::CheckFile()
{
	struct stat statBuf;
	int		nRet;
	char  strNewName[500];
	struct tm * pTime;

	if(m_file == NULL)
		return false;
	nRet = fstat(
#ifdef LINUX
	fileno(m_file)
#else
#ifdef HPUX
    fileno(m_file)
#else
	m_file->_file
#endif
#endif
    , &statBuf );

	if( nRet != 0 ) {
		printf( "CFileLogs:Bad file handle!\n" );
		return false;
	} else {
		if(statBuf.st_size > MAX_FILE_LEN) {
			pTime = localtime(&statBuf.st_mtime);
			sprintf( strNewName, "%sY%dM%dD%dH%dM%dS%d", m_FileName, pTime->tm_year + 1900, pTime->tm_mon+1, pTime->tm_mday, pTime->tm_hour, pTime->tm_min, pTime->tm_sec);
			fclose(m_file);
			m_file = NULL;
			rename(m_FileName, strNewName);
		}
	}
	return true;
}

void CFileLogs::GetTimeStr(char *pStr)
{
	time_t ltime;
	struct tm *pNow,now;

	time(<ime);
#ifdef WIN32
	pNow = localtime(<ime);
#else
	pNow = localtime_r(<ime, &now);
#endif
	sprintf(pStr, (char *)"%2d-%02d-%02d %02d:%02d:%02d",
		pNow->tm_year + 1900, pNow->tm_mon+1, pNow->tm_mday,
		pNow->tm_hour, pNow->tm_min, pNow->tm_sec);
	return;
}