log4cplus

log4cplus:是一个跨平台的C++库，下载网址：https://sourceforge.net/projects/log4cplus/
CMake是编译CMakeLists.txt的工具，下载网址：https://cmake.org/download/
如何使用CMake编译CMakeLists.txt，教程：http://jingyan.baidu.com/article/72ee561a6d775fe16138df28.html

使用例子说明 http://blog.youkuaiyun.com/lx_shudong/article/details/48732999

首先注意库的字符集方式，生成lib+dll后，引用方也应该与lib生成代码的一致，下面是代码及图：

下面是调用代码：

Log.h：

#pragma once
//#ifndef LOG_API
//#define LOG_API __declspec(dllexport)
//#else
//#define LOG_API __declspec(dllimport)
//#endif

#include <sstream>
#define FAT 50000
#define ERR 40000
#define WAR 30000
#define INF 20000

class  tLogger;

/*LOG_API*/ bool  LogInit(const std::string& config_path=std::string());
/*LOG_API*/ void  WriteLog(int leven, const std::string str);
/*LOG_API*/ void  LogEvent(int level, const char* format, ...);
#define FAT_LOG  Logger(FAT).Input(__LINE__,__FILE__) 

#define INF_LOG  Logger(INF).Input(__LINE__,__FILE__)

#define ERR_LOG  Logger(ERR).Input(__LINE__,__FILE__) 

#define WAR_LOG  Logger(WAR).Input(__LINE__,__FILE__) 

Log.cpp：

#include <log4cplus/layout.h>
#include <log4cplus/logger.h>
#include <log4cplus/configurator.h>
#include <log4cplus/loggingmacros.h>
#include <log4cplus/consoleappender.h>
#include <log4cplus/helpers/stringhelper.h>  
#include <thread>
#include <stdarg.h>
#include <stdio.h>
#include "Log.h"
#include <iostream>


#define BUF_LEN 8192
using namespace log4cplus;
using namespace log4cplus::helpers;

class  log4cplus_Logger
{
public:
	log4cplus_Logger(){};
	~log4cplus_Logger(){}
	bool Init(const std::string& conf_path = std::string());
	static log4cplus::Logger m_log4cplus_logger_;
private:
	std::string m_conf_path_;
};

log4cplus::Logger log4cplus_Logger::m_log4cplus_logger_;

bool  log4cplus_Logger::Init(const std::string& conf_path){
    if (conf_path.empty()){
        //输出到屏幕
        std::string pattern_layout = "[%d]%-5p:%m%n";
        log4cplus::SharedAppenderPtr ConsoleApp(new log4cplus::ConsoleAppender());
        std::auto_ptr<log4cplus::Layout> layout(new log4cplus::PatternLayout(pattern_layout));
        ConsoleApp->setLayout(layout);

        log4cplus_Logger::m_log4cplus_logger_ = log4cplus::Logger::getInstance("log");
        log4cplus_Logger::m_log4cplus_logger_.addAppender(ConsoleApp);
        log4cplus_Logger::m_log4cplus_logger_.setLogLevel(log4cplus::ALL_LOG_LEVEL);
    }
    else{
        m_conf_path_ = conf_path;
        try{
            log4cplus::PropertyConfigurator::doConfigure(conf_path.c_str());
            log4cplus_Logger::m_log4cplus_logger_ = log4cplus::Logger::getInstance("log");
            log4cplus_Logger::m_log4cplus_logger_.setLogLevel(log4cplus::ALL_LOG_LEVEL);
        }
        catch (...){
            std::cout << "LogModel Init faild!" << std::endl;
            return false;
        }
        
    }
    return true;
}



bool  LogInit(const std::string& config_path){
    log4cplus_Logger log;
    return log.Init(config_path);
}


 void  WriteLog(int leven,const std::string str){
    switch (leven)
    {
	case INF:
        LOG4CPLUS_INFO(log4cplus_Logger::m_log4cplus_logger_, str);
        break;
	case WAR:
        LOG4CPLUS_WARN(log4cplus_Logger::m_log4cplus_logger_, str);
        break;
	case ERR:
        LOG4CPLUS_ERROR(log4cplus_Logger::m_log4cplus_logger_, str);
        break;
	case FAT:
        LOG4CPLUS_FATAL(log4cplus_Logger::m_log4cplus_logger_, str);
        break;
    default:
        std::cout << "not have this log levnl" << std::endl;
        break;
    }
}

 void  LogEvent(int level, const char* format, ...){
    char buf[BUF_LEN] = { 0 };
    va_list args;
    va_start(args, format);
    _vsnprintf_s(buf, BUF_LEN, format, args);
	WriteLog(level, buf); //LogEvent(INF, "starting up CCQC program.");
}

调用方：ConsoleApplication1.cpp:

#include "stdafx.h"  
#include <stdlib.h>  
#include <stdio.h>  
#include <string.h>  
#include "Log.h"
using namespace std;
#include <iostream>
#include <thread>

int main()
{
	/*if (!LogInit()){
		std::cout
		<< "log model init faild!" << std::endl;
		return -1;
		}*/
	if (!LogInit("E:/canDel/ConsoleApplication1/ConsoleApplication1/cfg/log.conf")){
		std::cout
		<< "log model init faild!" << std::endl;
		return -1;
		}

	LogEvent(INF, "-----------------------------------------------------------------------");
	LogEvent(INF, "starting up CCQC program.");
	LogEvent(INF,"%s--%s--%s******" ,"starting up CCQC program.", "xwefefew","txwew" );

	getchar();

	return 0;
}

std::thread([&](){
		while (1){
			LogEvent(FAT,"this is FAT");
		}
	}).detach();

	std::thread([&](){
		while (1){
			LogEvent(INF, "this is INF");
		}
	}).detach();

	std::thread([&](){
		while (1){
			std::this_thread::sleep_for(std::chrono::seconds(2));
			LogEvent(ERR, "this is ERR");
		}
	}).detach();

	std::thread([&](){
		while (1){
			std::this_thread::sleep_for(std::chrono::seconds(2));
			LogEvent(WAR, "this is WAR");
		}
	}).detach();