如何用C ++编写日志文件

我会看到前面给出的C答案并提出一个C ++回答同样的事情：

I'll see the C answer given earlier and raise a C++ answer for the same thing:

#include <fstream>

void write_text_to_log_file( const std::string &text )
{
    std::ofstream log_file(
        "log_file.txt", std::ios_base::out | std::ios_base::app );
    log_file << text << std::end;
}

如果文件由于某种原因无法打开，奖金也是如此在一堆未定义的行为中崩溃。



干杯，



Ash



PS当你自己写的时候记录的重要部分是：



- 每条消息后刷新 - std： ：endl这样做



- 在每条消息后关闭文件 - fstream析构函数执行该操作

It'll do the same thing with the bonus that if the file fails to open for whatever reason it won't crash in a steaming heap of undefined behaviour.

Cheers,

Ash

PS the important bits of logging for when you write your own are:

- flush after every message - std::endl does that

- close the file after every message - the fstream destructor does that

您可以使用日志文件代码项目中存在的库

简单的LogFile [ ^ ]

you can use the log file library present in codeproject
A Simple LogFile[^]

日志文件基本上是一个文本文件。因此，您可以使用文件写入功能将日志写入其中。日志通常包含TimeStamp +错误代码+以及提及问题的小单行描述

log file is basically a text file. So you can use file writing functions to write logs on to it. Logs normally contains TimeStamp + Error Code + and a small single line description mentioning the problem