c++开源日志库log4cplus

1. 简介
log4cplus是C++编写的开源的日志系统, The purpose of this project is to port the excellent Log for Java (log4j)logging library to C++
log4cplus具有灵活、强大、使用简单、多线程安全的特点,实在是杂牌军、游击队的福音。

2. 安装使用(Linux)
log4cplus安装使用非常简单,从其官网:http://log4cplus.sourceforge.net/ 下载最新版本
运行:
tar xvzf log4cplus-x.x.x.tar.gz
cd log4cplus-x.x.x
./configure --prefix =/where/to/install
make
make install
在安装目录下生成include和lib两个文件夹,分别为头文件和库文件
使用:
g++ -o server   /mnt/hgfs/work_vm/project/work_project/server/obj/main.o    -L../..//third/log4cplus/lib/ -L../..//third/boost/lib/ -llog4cplus -lpthread -I/mnt/hgfs/work_vm/project/work_project/server/include  -I../..//third/log4cplus/include/-I../..//third/boost/include/
编译参数:
-L../..//third/log4cplus/lib/
-llog4cplus
-lpthread
-I../..//third/log4cplus/include/

3. 使用
log4cplus主要包括layout、appender、loglevel等内容,可以参考:
http://masterdog.bokee.com/153892.html
写的非常nice

4. 包装
logcplus包装下用起来非常方便,以下是我的包装,供参考
Log.h
// Log.h: interface for the Log class.
//
//

#if !defined(AFX_LOG_H__B87F71E3_FFAE_4CFA_A528_3F4F2FF7D69E__INCLUDED_)
#define AFX_LOG_H__B87F71E3_FFAE_4CFA_A528_3F4F2FF7D69E__INCLUDED_

#include "log4cplus/loglevel.h"
#include "log4cplus/ndc.h" 
#include "log4cplus/logger.h"
#include "log4cplus/configurator.h"
#include "iomanip"
#include "log4cplus/fileappender.h"
#include "log4cplus/layout.h"

#include "const.h"
#include "common.h"
#include "Main_config.h"

using namespace log4cplus;
using namespace log4cplus::helpers;

//日志封装
#define TRACE(p) LOG4CPLUS_TRACE(Log::_logger, p)
#define DEBUG(p) LOG4CPLUS_DEBUG(Log::_logger, p)
#define NOTICE(p) LOG4CPLUS_INFO(Log::_logger, p)
#define WARNING(p) LOG4CPLUS_WARN(Log::_logger, p)
#define FATAL(p) LOG4CPLUS_ERROR(Log::_logger, p)

// 日志控制类,全局共用一个日志
class Log
{
public:
	// 打开日志
	bool open_log();

	// 获得日志实例
	static Log& instance();
	
	static Logger _logger;

private:
	Log();

	virtual ~Log();

	//log文件路径及名称
	char _log_path[PATH_SIZE];
	char _log_name[PATH_SIZE];
};

#endif // !defined(AFX_LOG_H__B87F71E3_FFAE_4CFA_A528_3F4F2FF7D69E__INCLUDED_)

Log.cpp:
// Log.cpp: implementation of the Log class.
//
//

#include "Log.h"

//
// Construction/Destruction
//

Logger Log::_logger = log4cplus::Logger::getInstance("main_log");

Log::Log()
{
	snprintf(_log_path, sizeof(_log_path), "%s", "../log");
	snprintf(_log_name, sizeof(_log_name), "%s/%s.%s", _log_path, execname, "log");
}

Log::~Log()
{
}

Log& Log::instance()
{
    static Log log;
    return log;
}

bool Log::open_log()
{
	
    int Log_level = Main_config::instance().get_config().Read("LOG_LEVEL", 0);  

	/* step 1: Instantiate an appender object */
    SharedAppenderPtr _append(new FileAppender(_log_name));
    _append->setName("file log test");

	/* step 2: Instantiate a layout object */
	std::string pattern = "[%p] [%d{%m/%d/%y %H:%M:%S}] [%t] - %m %n";
    std::auto_ptr _layout(new PatternLayout(pattern));

    /* step 3: Attach the layout object to the appender */
    _append->setLayout(_layout);

    /* step 4: Instantiate a logger object */

    /* step 5: Attach the appender object to the logger  */
    Log::_logger.addAppender(_append);

	/* step 6: Set a priority for the logger  */
    Log::_logger.setLogLevel(Log_level);

    return true;
}
int Log_level = Main_config::instance().get_config().Read("LOG_LEVEL", 0); 

Main_config是我自己包装的一个配置类(参考:http://blog.csdn.net/yfkiss/article/details/6802451),通过读取配置设置log level。

使用:
#inlucde "Log.h"
程序初始化的时候:
    // 打开日志
    if (!Log::instance().open_log())
    {
        std::cout << "Log::open_log() failed" << std::endl;
        return false;
    }
然后使用NOTICE、FATAL等就可以打印日志到文件。

#include "Log.h"
....
	// 打开日志
	if (!Log::instance().open_log())
	{
		std::cout << "Log::open_log() failed" << std::endl;
		return false;
	}
.....
NOTICE("Server init succ");
FATAL("Server run failed");


转载于:https://my.oschina.net/zipu888/blog/549689

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