如何从c目录只有txt文件？ [英] How can I get only txt files from directory in c?

问题描述

我想在给定目录中获取仅* .txt文件的名称，如下：

I would like to get names of only *.txt files in given directory, sth like this:

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>

int main(int argc, char **argv)
{
    char *dirFilename = "dir";

    DIR *directory = NULL;

    directory = opendir (dirFilename);
    if(directory == NULL)
        return -1;

    struct dirent *ent;

     while ((ent = readdir (directory)) != NULL)
     {
         if(ent->d_name.extension == "txt")
            printf ("%s\n", ent->d_name);
     }

    if(closedir(directory) < 0)
        return -1;

    return 0;
}

如何在纯unixs中执行此操作？

How can I do this in pure unixs c?

推荐答案

首先，Unix没有文件扩展名的概念，因此 c $ c> struct dirent 。第二，你不能比较字符串与 == 。您可以使用

Firstly, Unix has no notion of file extensions, so there's no extension member on struct dirent. Second, you can't compare strings with ==. You can use something like

bool has_txt_extension(char const *name)
{
    size_t len = strlen(name);
    return len > 4 && strcmp(name + len - 4, ".txt") == 0;
}

> 4 部分确保文件名 .txt 不匹配。

The > 4 part ensures that the filename .txt is not matched.

code> bool 来自< stdbool.h> 。）

(Obtain bool from <stdbool.h>.)

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