#include <dirent.h> 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *dirname="/path/";
DIR *dirfile;
dirfiles=opendir(dirname);
struct dirent *dir;
while((dir = readdir(dirfiles)) != NULL)
{
   if(strcmp(dir->d_name,".")==0||strcmp(dir->d_name,"..")==0)// delete . ..
      continue;
   char filename[PATH_MAX];
   strcpy(filename,dirname);
   strcat(filename,dir->d_name);
   '''
   '''
}
closedir(dirfile);
 

參考連結：

【Linux程式設計】C/C++獲取目錄下檔案或目錄

https://songlee24.github.io/2014/09/20/linux-get-directory/