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 excellentLog 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> _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");