做简单网站,视频模板网站,网站后台空白,网站建设应该学什么软件项目日志——Log4cpp 开源的C类库Log4cpp提供了很多功能#xff0c;帮助我们的应用程序更方便地记录日志。 安装与构建 Log4cpp官网——http://log4cpp.sourceforge.net/ wget https://nchc.dl.sourceforge.net/project/log4cpp/log4cpp1.1.x%20%28new%29/log4cpp-1.1/log4cpp…项目日志——Log4cpp 开源的C类库Log4cpp提供了很多功能帮助我们的应用程序更方便地记录日志。 安装与构建 Log4cpp官网——http://log4cpp.sourceforge.net/ wget https://nchc.dl.sourceforge.net/project/log4cpp/log4cpp1.1.x%20%28new%29/log4cpp-1.1/log4cpp-1.1.3.tar.gztar zxvf log4cpp-1.1.3.tar.gz
cd log4cpp
# root用户
./configure --prefix执行路径
# 示例
# ./configure --prefix/home/xuanxuan/share_bike/third/lib/log4cpp
make
make install使用 包含头文件 #include log4cpp/Category.hh
#include log4cpp/FileAppender.hh
#include log4cpp/PatternLayout.hh
#include log4cpp/OstreamAppender.hh初始化日志输出的目的地 示例1:输出到标准输出std::cout
log4cpp::Appender *appender new log4cpp::OstreamAppender(root, std::cout);示例2:输出到log文件
log4cpp::Appender *appender new log4cpp::FileAppender(root, test.log);输出方式如下:
log4cpp::FileAppender // 输出到文件
log4cpp::RollingFileAppender // 输出到回卷文件即当文件到达某个大小后回卷
log4cpp::OstreamAppender // 输出到一个ostream类
log4cpp::RemoteSyslogAppender // 输出到远程syslog服务器
log4cpp::StringQueueAppender // 内存队列
log4cpp::SyslogAppender // 本地syslog
log4cpp::Win32DebugAppender // 发送到缺省系统调试器
log4cpp::NTEventLogAppender // 发送到win 事件日志注意 实际上日志输出到终端或文件中是很慢的可能会引起IO中断,所以我们可以先输出到内存中(StringQueueAppender),然后在输出到其它地方这样效率较高。 设置日志输出格式 log4cpp::PatternLayout *patternLayout new log4cpp::PatternLayout();
patternLayout-setConversionPattern(%d [%p] - %m%n);
appender-setLayout(patternLayout);日志输出格式控制如下: log4cpp::PatternLayout Class Reference %%%% - a single percent sign
%c - the category
%d - the date
Date format: The date format character may be followed by a date format specifier enclosed between braces. For example, %d{%H:%M:%S,%l} or %d{%d %m %Y %H:%M:%S,%l}. If no date format specifier is given then the following format is used: Wed Jan 02 02:03:55 1980. The date format specifier admits the same syntax as the ANSI C function strftime, with 1 addition. The addition is the specifier %l for milliseconds, padded with zeros to make 3 digits.
%m - the message
%n - the platform specific line separator
%p - the priority
%r - milliseconds since this layout was created.
%R - seconds since Jan 1, 1970
%u - clock ticks since process start
%x - the NDC设置输出类别和日志优先级 log4cpp::Category root log4cpp::Category::getRoot();
root.setPriority(log4cpp::Priority::NOTICE);
root.addAppender(appender);日志的级别如下: NOTSET DEBUG INFO NOTICE WARN ERROR CRIT ALERT FATAL EMERG。 低于该级别的日志不会被记录。 定义宏来减少代码量 #define LOG(__level) log4cpp::Category::getRoot() log4cpp::Priority::__level __FILE__ __LINE__ : 使用:
LOG(DEBUG)DEBUG.;测试 什么是单例 程序中仅有一个的对象。 配置文件:log.conf
#定义Root category的属性
log4cpp.rootCategoryDEBUG, RootLog#定义RootLog属性
log4cpp.appender.RootLogRollingFileAppender
log4cpp.appender.RootLog.layoutPatternLayoutlog4cpp.appender.RootLog.layout.ConversionPattern%d{%m-%d %H:%M:%S %l} [%t][%p]%m%n
log4cpp.appender.RootLog.fileName/var/log/share_bike.log
log4cpp.appender.RootLog.maxFileSize268435456 #256MB
log4cpp.appender.RootLog.fileNamePatternshare_bike_%i.log
log4cpp.appender.RootLog.maxBackupIndex256封装为一个类 Logger.h
#ifndef DISTRIBUTED_LOGGER_H_
#define DISTRIBUTED_LOGGER_H_#include string
#include log4cpp/Category.hhclass Logger{
public:bool init(const std::string log_conf_file);static Logger* instance(){//返回单例——全局唯一对象return instance_;}log4cpp::Category* GetHandle(){return category_;}protected:static Logger instance_;log4cpp::Category* category_;
};#define LOG_INFO Logger::instance()-GetHandle()-info
#define LOG_DEBUG Logger::instance()-GetHandle()-debug
#define LOG_ERROR Logger::instance()-GetHandle()-error
#define LOG_WARN Logger::instance()-GetHandle()-warn#endifLogger.cpp
#include Logger.h#include iostream
#include log4cpp/Category.hh
#include log4cpp/FileAppender.hh
#include log4cpp/PatternLayout.hh
#include log4cpp/OstreamAppender.hh
#include log4cpp/PropertyConfigurator.hhLogger Logger::instance_;bool Logger::init(const std::string log_conf_file){try{log4cpp::PropertyConfigurator::configure(log_conf_file);}catch(log4cpp::ConfigureFailure f){std::cerr load log config file log_conf_file.c_str() failed with result : f.what() std::endl;return false;}category_ log4cpp::Category::getRoot();return true;
}测试 main.cpp
#include iniconfig.h //注意路径会在CMake中进行调整
#include configdef.h
#include Logger.hint main(int argc,char** argv){if(argc ! 3){//缺少参数printf(Please input shbk config file path log file config!\n);return -1;}if(!Logger::instance()-init(std::string(argv[2]))){fprintf(stderr,init log module failed.\n);return -2;}Iniconfig config;if(!config.loadfile(std::string(argv[1]))){//printf(load %s failed.\n,argv[1]);LOG_ERROR(load %s failed.,argv[1]);return -3;}//测试是否读取成功st_env_config conf_args config.getconfig();LOG_INFO([database]ip:%s\n [database]port:%d\n [database]user:%s\n [database]pwd:%s\n [database]db:%s\n [server]port:%d\n ,conf_args.db_ip.c_str(),conf_args.db_port,conf_args.db_user.c_str(),conf_args.db_pwd.c_str(),conf_args.db_name.c_str(),conf_args.svr_port);return 0;
}**注意链接库:**下面为示例请根据自身情况调整。
TARGET_LINK_LIBRARIES(common log4cpp)TARGET_LINK_LIBRARIES(share_bike pthread)
TARGET_LINK_LIBRARIES(${PROJECT_NAME} liblog4cpp.a)执行:
./share_bike ../conf/share_bike.ini ../conf/log.conf查看: 在log.conf中。/var/log/share_bike.log为保存路径。 log4cpp.appender.RootLog.fileName/var/log/share_bike.log
