多线程如何输出到日志

[syl04035102]

小弟起了40个线程，每个线程用GetTickCount()附一个唯一的标志符，但老是出问题，网上说给每个线程协一个日志，然后调试的时候查看日志就能确定错误的代码，但是具体不知道如何做，如何输出到日志，那位大侠具体指点下，不甚感激！

[scq2099yt]

up

[syl04035102]

谢谢楼上

[syl04035102]

呀，分给错了

[iGoo]

写日志的意思是，把调试信息写入文件，方便查找
给你一个写日志类

log.h

#include <windows.h>
#include <fstream>

class CSynObj
{
public:
	CSynObj()
	{
	    InitializeCriticalSection(&m_cs);
	}
   
	~CSynObj()
	{
		DeleteCriticalSection(&m_cs);
	}

   void Lock()
   {
	   EnterCriticalSection(&m_cs);	
   }

   void UnLock()
   {
       LeaveCriticalSection(&m_cs);
	   
   }

private:
	CRITICAL_SECTION m_cs;
};

class CLock		
{
public:
	CLock(CSynObj& synchobject)
		:refSynchObject(synchobject)
	{
		refSynchObject.Lock();
	}

	virtual ~CLock()
	{
		refSynchObject.UnLock();
	}

protected:
	CSynObj& refSynchObject;
};

enum LOG_TARGET_E
{
	LOG_TARGET_SCREEN	= 1,
	LOG_TARGET_FILE		= 2,
};


class CLog
{
private:

	~CLog();

	CLog();

	CLog(const CLog& rhs) {}

	CLog& operator = (const CLog& rhs) {}

	static CLog*	m_pLog;

	static CSynObj	m_Lock;

	std::ofstream	m_OutFile;

	void GetSysTime(SYSTEMTIME* lpSysTime);

	void FormatAllTime(const SYSTEMTIME& refSysTime, std::string& strOut);

public:

	void	Write(char* pMsg, int nTarget);

	static CLog*	GetInstance();

	// 摧毁singleton的入口
	static void DestroyInstance();
};

__inline void DEBUG_MSG(LPSTR filename, int lineno, LPSTR linedesc, DWORD dwErrCode, int nOutPutTarget = LOG_TARGET_SCREEN|LOG_TARGET_FILE)
{
	char cTemp[256];
	sprintf( cTemp, "%lu error on %d line in %s file: %s", dwErrCode, lineno, filename, linedesc );
	CLog* pLog = CLog::GetInstance();
	pLog->Write( cTemp, nOutPutTarget );
}

log.cpp

#include "Log.h"
#include <iostream>

//#ifdef _DEBUG
//#define _CRTDBG_MAP_ALLOC
//#include <stdlib.h>
//#include "crtdbg.h"
//#define new new(_NORMAL_BLOCK, __FILE__, __LINE__)
//#endif

CLog* CLog::m_pLog = NULL;
CSynObj	CLog::m_Lock;

CLog::~CLog()
{
	m_OutFile.close();
}

CLog::CLog()
{
	m_OutFile.open( "netdug.txt", std::ios::app );
	atexit( CLog::DestroyInstance );
}

void CLog::GetSysTime(SYSTEMTIME* lpSysTime)
{
	//获得系统时间
	FILETIME CurFileTime;
	::GetSystemTimeAsFileTime(&CurFileTime);
	::FileTimeToLocalFileTime(&CurFileTime, &CurFileTime);
	::FileTimeToSystemTime(&CurFileTime, lpSysTime);
}

void CLog::FormatAllTime(const SYSTEMTIME& refSysTime, std::string& strOut)
{
	//系统时间转换成字符串
	char cBuffer[MAX_PATH*2];
	sprintf(cBuffer,"%d-%02d-%02d %02d:%02d:%02d",
		refSysTime.wYear, refSysTime.wMonth, refSysTime.wDay , refSysTime.wHour , refSysTime.wMinute , refSysTime.wSecond);
	strOut = cBuffer;
}


void CLog::Write(char* pMsg, int nTarget)
{
	CLock Lock( CLog::m_Lock );
	SYSTEMTIME Systime;
	std::string strTime;
	GetSysTime( &Systime );
	FormatAllTime( Systime, strTime );
	if( nTarget & LOG_TARGET_FILE )
		m_OutFile << strTime.c_str() << ": " << pMsg << std::endl;
	if( nTarget & LOG_TARGET_SCREEN )
		std::cout << pMsg << std::endl;
}


CLog* CLog::GetInstance()
{
	// 为提高效率，执行双次检测
	if( !m_pLog )
	{
		CLock Lock( CLog::m_Lock );
		if( !m_pLog )
			m_pLog = new CLog;
	}
	return m_pLog;
}


void CLog::DestroyInstance()
{
	delete m_pLog;
	m_pLog = NULL;
}

[ouyh12345]

log4cpp

GetCurrentThreadId获得当前线程的id

[Torch009]

有了线程ID就好办了。