log4cpp-【写日志】：使用log4cpp的基本步骤
转自：http://wyw1986119.blog.163.com/blog/static/6332862008112793346967/
手动使用log4cpp的基本步骤如下：
1. 实例化一个layout 对象；
2. 初始化一个appender 对象；
3. 把layout对象附着在appender对象上；
4. 调用log4cpp::Category::getInstance("name"). 实例化一个category对象；
5. 把appender对象附到category上（根据additivity的值取代其他appender或者附加在其他appender后）。
6. 设置category的优先级；
| // FileName: test_log4cpp1.cpp // Test log4cpp by manual operation. // Announce: use as your own risk. // Compile : g++ -otest1 -llog4cpp test_log4cpp1.cpp // Run : ./test1 // Tested : RedHat 7.2 log4cpp0.3.4b // Author : liqun ([email protected]) // Data : 2003-6-27 #include "log4cpp/Category.hh" #include "log4cpp/FileAppender.hh" #include "log4cpp/BasicLayout.hh" int main(int argc, char* argv[]) { // 1实例化一个layout 对象 log4cpp::Layout* layout = new log4cpp::BasicLayout(); // 2. 初始化一个appender 对象 log4cpp::Appender* appender = new log4cpp::FileAppender("FileAppender", "./test_log4cpp1.log"); // 3. 把layout对象附着在appender对象上 appender->setLayout(layout); // 4. 实例化一个category对象 log4cpp::Category& warn_log = log4cpp::Category::getInstance("mywarn"); // 5. 设置additivity为false，替换已有的appender warn_log.setAdditivity(false); // 5. 把appender对象附到category上 warn_log.setAppender(appender); // 6. 设置category的优先级，低于此优先级的日志不被记录 warn_log.setPriority(log4cpp::Priority::WARN); // 记录一些日志 warn_log.info("Program info which cannot be wirten"); warn_log.debug("This debug message will fail to write"); warn_log.alert("Alert info"); // 其他记录日志方式 warn_log.log(log4cpp::Priority::WARN, "This will be a logged warning"); log4cpp::Priority::PriorityLevel priority; bool this_is_critical = true; if(this_is_critical) priority = log4cpp::Priority::CRIT; else priority = log4cpp::Priority::DEBUG; warn_log.log(priority,"Importance depends on context");
warn_log.critStream() << "This will show up << as " << 1 << " critical message" << log4cpp::CategoryStream::ENDLINE; // clean up and flush all appenders log4cpp::Category::shutdown(); return 0; } |