c - 使用C代码重命名文件夹中的文件

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我有 3 个文件夹，每个文件夹包含不同的文件名我想重命名每个文件夹的文件，如下例所示:

folder1                     folder 2                            folder3

image1.pnm                  image1.pnm                        image1.pnm

image2.pnm                  image2.pnm                        image2.pnm

.....                       .....                                     .....

imageN.pnm                  imageN.pnm                        imageN.pnm   

void change_all_filename_in_dir(char *dirname)
{
    char newname[] = "image";
    char extension[] = ".jpg"; 
    DIR *dir;
    struct dirent *ent;
    int i = 0;
    
    if ((dir = opendir (dirname)) != NULL) 
    {
        while ((ent = readdir (dir)) != NULL) 
        {
            rename(ent->d_name, strcat(strcat(newname, i), extension);
            i++;
        }
    closedir (dir);
    } 
    else 
    {
       printf(" folder not openend");
    }
}

Answer 1

使用rename()函数。

#include <stdio.h>
int rename(const char *old, const char *new);

Description

The rename function causes the file whose name is the string pointed to by old to be henceforth known by the name given by the string pointed to by new. The file named old is no longer accessible by that name. If a file named by the string pointed to by new exists prior to the call to the rename function, the behavior is implementation-defined.

The rename function returns zero if the operation succeeds, nonzero if it fails, in which case if the file existed previously it is still known by its original name.