做项目时候经常需要打印日志来输出一些重要的信息，自己实现了一个简单的日志类，记录下。
Log.h
1 #pragma once 2 3 class CVxILog 4 { 5 private: 6 CVxILog(); 7 ~CVxILog(); 8 public: 9 static CVxILog* Instance() 10 { 11 static CVxILog log; 12 return &log; 13 } 14 15 void AddLog(const char* msg); 16 17 void AddLogEx(const char* format, ...); 18 private: 19 static const char* m_pFileName; 20 21 static CRITICAL_SECTION s_cs; 22 }; 23 24 #define WRITE_LOG(msg) CVxILog::Instance()->AddLog(msg) 25 #define WRITE_LOG_EX(format,...) CVxILog::Instance()->AddLogEx(format,__VA_ARGS__)
Log.cpp
1 #include "stdafx.h" 2 #include "Log.h" 3 #include <fstream> 4 5 CRITICAL_SECTION CVxILog::s_cs; 6 7 const char* CVxILog::m_pFileName = _T("Test.log"); 8 9 #define MAX_LOG_LENGTH 1024 //最大Log长度 10 11 static void WriteHeadStr(std::ofstream& out) 12 { 13 SYSTEMTIME st = {0}; 14 GetLocalTime(&st); 15 char timeStr[MAX_LOG_LENGTH] = {0}; 16 sprintf_s(timeStr,"[%d-%02d-%02d %02d:%02d:%02d] ",st.wYear,st.wMonth,st.wDay,st.wHour,st.wMinute,st.wSecond); 17 out << timeStr; 18 } 19 20 CVxILog::CVxILog() 21 { 22 ::InitializeCriticalSection(&s_cs); 23 } 24 CVxILog::~CVxILog() 25 { 26 ::DeleteCriticalSection(&s_cs); 27 } 28 29 void CVxILog::AddLog(const char* msg) 30 { 31 ::EnterCriticalSection(&s_cs); 32 std::ofstream out; 33 out.open(m_pFileName,std::ios_base::app|std::ios_base::out); 34 if(out.is_open()) 35 { 36 WriteHeadStr(out); 37 out << msg << std::endl; 38 out.close(); 39 } 40 ::LeaveCriticalSection(&s_cs); 41 } 42 43 void CVxILog::AddLogEx(const char* format, ...) 44 { 45 ::EnterCriticalSection(&s_cs); 46 std::ofstream out; 47 out.open(m_pFileName,std::ios_base::app|std::ios_base::out); 48 if(out.is_open()) 49 { 50 WriteHeadStr(out); 51 52 va_list ap; 53 va_start(ap,format); 54 char msg[MAX_LOG_LENGTH]; 55 int size = vsnprintf_s(msg,MAX_LOG_LENGTH-1,format,ap); 56 if(size > 0) 57 { 58 out << msg << std::endl; 59 } 60 va_end(ap); 61 62 out.close(); 63 } 64 ::LeaveCriticalSection(&s_cs); 65 }
使用时可以
1 WRITE_LOG("log test"); 2 WRITE_LOG_EX("[%s],log test",__FUNCTION__);
基本满足使用，但是还有很多不足，欢迎大家批评指正