在C中读取多个文本文件 [英] Reading multiple text files in C

问题描述

当您知道目录中会有很多文件时，从文本文件读取和提取数据的正确方法是什么?我知道您可以使用 fopen()来获取指向文件的指针，然后执行 while(fgets(..)！= null){} 这样的操作来从整个文件中读取，但是如何从另一个文件中读取?我想遍历目录中的每个文件.

What is the correct way to read and extract data from text files when you know that there will be many in a directory? I know that you can use fopen() to get the pointer to the file, and then do something like while(fgets(..) != null){} to read from the entire file, but then how could I read from another file? I want to loop through every file in the directory.

推荐答案

Sam，您可以像下面的小功能一样使用opendir/readdir.

Sam, you can use opendir/readdir as in the following little function.

#include <stdio.h>
#include <dirent.h>

static void scan_dir(const char *dir)
{
    struct dirent * entry;
    DIR *d = opendir( dir );

    if (d == 0) {
        perror("opendir");
        return;
    }

    while ((entry = readdir(d)) != 0) {
        printf("%s\n", entry->d_name);
        //read your file here
    }
    closedir(d);
}


int main(int argc, char ** argv)
{
    scan_dir(argv[1]);
    return 0;
}

这只是打开在命令行上命名的目录，并打印其中包含的所有文件的名称.但是，除了打印名称之外，您还可以根据需要处理文件...

This just opens a directory named on the command line and prints the names of all files it contains. But instead of printing the names, you can process the files as you like...

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