C++开源日志库--Glog的使用

C++开源日志库--Glog的使用

公司其他同事大多做C#的，公司内部暂时也没用提供自己的C++日志库，由于项目较紧急，所以就准备选一个开源日志库使用，由于以前做过java，用的Log4j比较强大，但是查了下，其使用起来有点复杂。所以就想到最伟大的公司google了，其Glog使用还是比较简单的，源码下下来直接用VS编译生成lib和dll库，源码文件中都有现成的vs工程。

开源项目首页：https://code.google.com/p/google-glog/

Glog项目路径： https://code.google.com/p/google-glog/downloads/list

第一步，下载glog-0.3.3.tar.gz，解压，直接打开google-glog.sln工程文件，如果vs版本不对，让其自动转换

第二步，编译，在Debug下生成libglog.dll、 libglog.lib、libglog_static.lib

第三步，将头文件和lib库拷贝到自己的工程下，由于我暂时是window下使用，头文件使用 \glog-0.3.3\src\windows\glog

第四步，引用到自己工程下，编译发现报错：

1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  SessionMgr.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  SessionFactory.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  RealTimeStreamSession.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  main.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  GNumGenerator.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  DevicControlSession.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
1>  CatalogSesssion.cpp
1>d:\workspace\video\videomanage\devicemgr\lib\glog\glog\log_severity.h(55): fatal error C1189: #error :  ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
进入log_severity.h头文件查看，是一个宏定义的地方出现了冲突：

#ifndef GLOG_NO_ABBREVIATED_SEVERITIES
# ifdef ERROR
#  error ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
# endif
const int INFO = GLOG_INFO, WARNING = GLOG_WARNING,
  ERROR = GLOG_ERROR, FATAL = GLOG_FATAL;
#endif
解决方法：

在工程加上预编译宏GLOG_NO_ABBREVIATED_SEVERITIES

C/C++  -->  预处理器  -->  预处理器定义  -->  加上GLOG_NO_ABBREVIATED_SEVERITIES宏  保存，编译通过~

第五步，自己的项目中使用

#include "glog/logging.h"
int _tmain(int argc, _TCHAR* argv[])
{ 
 google::InitGoogleLogging((const char *)argv[0]);  //参数为自己的可执行文件名

 google::SetLogDestination(google::GLOG_INFO,"./myInfo");

 LOG(INFO) << "This is a <Warn> log message..." << ;

        .....................

}

搞定，后面就是将这些日志在工程中使用起来了。