逐行读取文本文件 [英] read line by line text file

问题描述

嗨 我有一个文本文件.该文件中有3个文本留置权.
我想阅读文本文件.
如何才能逐行读取此文件?

Hy I have a text file . in this file there are 3 text liens .
I want to read the text file .
How can I read line by line this file ?

推荐答案

您可以使用C库 iostream [ ^ ]类.

You could use the C library fread()[^] function, or the C++ iostream[^] class.

如果要使其保持简单愚蠢:

If you want to keep it simple stupid:

#include <stdio.h>

void process_line(const char* line)
{
    // you line processing here
}

void test()
{
    FILE* f = fopen("myfile.txt", "r");
    if (f)
    {
        // replace the line below to "for (;;)" if you want to process all lines
        for (int i=0; i<3; ++i)
        {
            const int MAX_LINE_LENGTH = 0x100;
            char line[MAX_LINE_LENGTH];
            if (!fgets(line, sizeof(line), f))
                break;
            int len = strlen(line);
            if (len>0 && line[len-1]=='\n')
                line[len-1] = 0;
            process_line(line);
        }
        fclose(f);
    }
}

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