一个迷你的日志类（c++版）

这个日志系统是我花了几小时写出来的，功能还不齐全，我会在以后继续不断完善，争取做到商业级别的。

另目前不支持unicode，但是我已经实验成功了如何支持unicode了。

代码如下：

#pragma once #include "common.h" #include <time.h> #include <windows.h> /******************************************* * 一个小型的日志系统，不支持文件分割 * 不支持非日志模式(及此模式下优化) * 不支持debugview * 不支持格式化 * 不支持多实例 * 不支持重定向 * 不支持多线程 * 陷阱： LOG**有多行语句 ******************************************/ template<typename LOCK> class guard { LOCK _lock; public: guard(LOCK lock) { _lock = lock; _lock.acquire(); } ~guard() { _lock.release(); } }; class critical_section { public: critical_section() { ; } ~critical_section() { ; } void acquire() { ; } void release() { ; } }; class mutex { public: void acquire() { ; } void release() { ; } }; template<typename T> class singleton { protected: singleton() { } public: static T* create_instance() { if (__instance == NULL) { __instance = new T; } return __instance; } static T* instance() { return __instance; } protected: static T* __instance; }; template<typename T> T* singleton<T>::__instance = NULL; enum e_log_level { LOG_LEVEL_TRACE, LOG_LEVEL_DEBUG, LOG_LEVEL_INFO, LOG_LEVEL_WARN, LOG_LEVEL_ERROR, LOG_LEVEL_FATAL }; class log_system : public singleton<log_system> { friend class singleton<log_system>; private: log_system() { _initialized = false; } public: bool init(const string log_file, e_log_level log_level) { // string file_name = "c:/axaz.log.txt"; _outfile.open(log_file.c_str()); set_level(log_level); return _initialized = (_outfile != 0); } void finilly() { if (_initialized && _outfile) { _outfile.close(); } } void set_level(e_log_level log_level) { _log_evel = log_level; } void set_cur_level(e_log_level cur_level) { _cur_evel = cur_level; } template<typename T> log_system& operator<<(const T obj) { if (_cur_evel >= _log_evel && _initialized) { _outfile << obj; } return *this; } template<> log_system& operator<<(const char* obj) { if (_cur_evel >= _log_evel && _initialized) { _outfile << obj; } return *this; } template<> log_system& operator<<(const string& obj) { if (_cur_evel >= _log_evel && _initialized) { _outfile << obj; } return *this; } log_system& log_cur_time() { if (_cur_evel >= _log_evel && _initialized) { char obj[30] = {0}; static SYSTEMTIME nowtime = {0}; GetLocalTime(&nowtime); sprintf(obj, "%02d:%02d:%02d.%03d/t", nowtime.wHour, nowtime.wMinute, nowtime.wSecond, nowtime.wMilliseconds); _outfile << obj; } return *this; } log_system& operator<<(basic_ostream<char, char_traits<char> >& (*obj)(basic_ostream<char, char_traits<char> >&)) { if (_cur_evel >= _log_evel && _initialized) { _outfile << obj; } return *this; } public: private: ofstream _outfile; bool _initialized; e_log_level _log_evel; e_log_level _cur_evel; }; #define __LOG log_system::instance()->log_cur_time() << "(" << __LINE__ << ")/t" #define LOG_TRACE log_system::instance()->set_cur_level(LOG_LEVEL_TRACE); __LOG << "TRACE/t" #define LOG_DEBUG log_system::instance()->set_cur_level(LOG_LEVEL_DEBUG); __LOG << "DEBUG/t" #define LOG_INFO log_system::instance()->set_cur_level(LOG_LEVEL_INFO); __LOG << "INFO/t" #define LOG_WARN log_system::instance()->set_cur_level(LOG_LEVEL_WARN); __LOG << "WARN/t" #define LOG_ERROR log_system::instance()->set_cur_level(LOG_LEVEL_ERROR); __LOG << "ERROR/t" #define LOG_FATAL log_system::instance()->set_cur_level(LOG_LEVEL_FATAL); __LOG << "FATAL/t" #define LOG LOG_DEBUG #ifdef TEST_LOG int _tmain(int argc, _TCHAR* argv[]) { log_system *log = log_system::create_instance();//要做空指针判断 log_system& LOG = *(log_system::instance()); LOG.init("c:/log.txt", LOG_LEVEL_DEBUG); LOG << "hello, world" << endl; LOG << "yes, please" << endl; LOG.finilly(); return 0; } int _tmain(int argc, _TCHAR* argv[]) { log_system::create_instance(); log_system::instance()->init("c:/log.txt", LOG_LEVEL_DEBUG); LOG << "Hello, world" << endl; LOG_TRACE << "hi" << endl; LOG_FATAL << "ok" << endl; log_system::instance()->finilly(); return 0; } #endif

在这个日志的实现的过程中，我终于明白了为什么ACE打日志要用双括号了。下一步是加上多线程支持，毕竟这个功能最重要。