1 #include<iostream> 2 #include<windows.h> 3 #include <MMSystem.h> 4 #pragma comment(lib, "winmm.lib") 5 #include<time.h> 6 #include<stdint.h> 7 using namespace std; 8  9 #define MAX_LOG_FILE_SIZE 0x4000000    //64MB10 11 class CTimer{12 public:13     CTimer()14     {15         m_tickCount = 0;16     }17     ~CTimer()18     {19         if(m_timerID)20         {21             timeKillEvent(m_timerID);22         }23     }24     static void CALLBACK TimerCallBack(UINT uTimeID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2);25     void OnTimer();26     void Log(const char* fmt,...);27 28 protected:29     void Call()30     {31         Log("tick...%d",m_tickCount);32         ++m_tickCount;33     }34     void print_format_time(FILE* fileName);35 36 private:37     MMRESULT m_timerID;38     int m_tickCount;39 };40 41 void CALLBACK CTimer::TimerCallBack(UINT uTimeID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)42 {43     CTimer *_ctimer = (CTimer*)dwUser;44     _ctimer->Call();45 }46 47 void CTimer::OnTimer()48 {49     timeSetEvent(1000,1,(LPTIMECALLBACK)TimerCallBack,(DWORD)this,TIME_PERIODIC);50 }51 52 void CTimer::print_format_time(FILE* fileName)53 {54     SYSTEMTIME _sysTime;55     GetLocalTime(&_sysTime);56 57     fprintf(fileName,"%04d-%02d-%02d %02d:%02d:%02d.%06d        ",_sysTime.wYear,58         _sysTime.wMonth,_sysTime.wDay,_sysTime.wHour,_sysTime.wMinute,_sysTime.wSecond,_sysTime.wMilliseconds);59 }60 61 void CTimer::Log(const char* fmt,...)62 {63     static int file_no(0);64     static FILE* log_fp = NULL;65     if(log_fp == NULL)66     {67         char log_name[64];68         uint32_t pid;69         pid = (uint32_t)GetCurrentProcessId();70         sprintf_s(log_name,64,"log_%d_%d.txt",pid,file_no);71         fopen_s(&log_fp,log_name,"w");72         if(!log_fp)73             return;74     }75     print_format_time(log_fp);76 77     va_list ap;78     va_start(ap,fmt);79     vfprintf_s(log_fp,fmt,ap);80     va_end(ap);81     fflush(log_fp);82     fprintf(log_fp,"\n");83     if(ftell(log_fp) > MAX_LOG_FILE_SIZE)84     {85         fclose(log_fp);86         log_fp = NULL;87         ++file_no;88     }89 90 }91 92 int main(int argc, char* argv[])93 {94     CTimer _timer;95     _timer.OnTimer();96 　　system("pause");97     return 0;98 }