簡單的C++輸出日志

 

myLog.h

#ifndef __myLog_H_
#define __myLog_H_
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>

#include <iostream>
#include <ratio>
#include <chrono>
#include <mutex>

std::string GetName(char * fileName);

std::string getCurrentSystemTime();

long long getCurrentMs();
// 初始化路徑
int LOGINIT(char *path);
// 結束時候調用
int LOGEnd();
// 設置最大日志文件，默認5M, mSize單位是字節
int LOGSetMaxSpace(int mSize);

int logWrite(char * s);

#define  LOGE(...)  {\
    char temp[8192] = {0};      \
    sprintf(temp, "%s", getCurrentSystemTime().c_str());  \
    sprintf(temp+strlen(temp), " %s %d ", GetName(__FILE__).c_str(), __LINE__);  \
    sprintf(temp+strlen(temp), __VA_ARGS__); \
    sprintf(temp + strlen(temp), "\n");    \
    printf("%s", temp);   \
    logWrite(temp); \
}
#endif

myLog.cpp

#include "myLog.h"

std::mutex mux;
static FILE * fp = NULL;
int MaxLenChar = 1024 * 1024 * 5; // 5 M 數據

int LOGINIT(char *path)
{
    fp = fopen(path, "w+");
    if (fp == NULL)
    {
        return -1;
    }
    return 0;
}
int LOGSetMaxSpace(int mSize)
{
    MaxLenChar = mSize;
    return 0;
}

int logWrite(char * s)
{
    if (fp)
    {
        int len = ftell(fp);
        if (len > MaxLenChar)
        {
            LOGEnd();
            return 0;
        }
        mux.lock();
        fprintf(fp, "%s", s);
        fflush(fp);
        mux.unlock();
    }

    return 0;
}

int LOGEnd()
{
    if (fp)
    {
        fflush(fp);
        fclose(fp);
        fp = 0;
    }
    return 0;
}

std::string getCurrentSystemTime()
{
    auto time_now = std::chrono::system_clock::now();
    auto tt = std::chrono::system_clock::to_time_t(time_now);
    auto duration_in_ms = std::chrono::duration_cast<std::chrono::milliseconds>(time_now.time_since_epoch());
    auto duration_in_s = std::chrono::duration_cast<std::chrono::seconds>(time_now.time_since_epoch());
    int theMs = duration_in_ms.count() - duration_in_s.count() * 1000;
    struct tm* ptm = localtime(&tt);


    char date[60] = { 0 };
    sprintf(date, "%d-%02d-%02d-%02d.%02d.%02d.%03d%",
        (int)ptm->tm_year + 1900, (int)ptm->tm_mon + 1, (int)ptm->tm_mday,
        (int)ptm->tm_hour, (int)ptm->tm_min, (int)ptm->tm_sec, theMs);
    return std::string(date);
}
long long getCurrentMs()
{
    auto time_now = std::chrono::system_clock::now();
    auto duration_in_ms = std::chrono::duration_cast<std::chrono::milliseconds>(time_now.time_since_epoch());

    return duration_in_ms.count();
}
std::string GetName(char * fileName)
{
    char temp[256] = { 0 };
    memcpy(temp, fileName, strlen(fileName) + 1);

    std::string sName = temp;

#ifdef WIN32
    int startP = sName.find_last_of("\\");
    if (startP == -1)
    {
        startP = 0;
    }
    std::string theLastName = sName.substr(startP + 1, sName.size() - startP);

#else
    int startP = sName.find_last_of("/");
    if (startP == -1)
    {
        startP = 0;
    }
    std::string theLastName = sName.substr(startP + 1, sName.size() - startP);

#endif
    return theLastName;
}

 

mian.cpp

#include<stdio.h>
#include "myLog.h"

LOGINIT("mylog.log")

int main()
{
    int age=18;
    char name[10]="fly";
     
    LOGE("My name is %s，I am %d years old.", name,age);

    LOGEnd();

    return 0;
}