C and C++ gets the list of files in the directory

1. Data structure

struct dirent
{
    long d_ino;                 
    off_t d_off;                
    unsigned short d_reclen;    
    unsigned char d_type;            
    char d_name [NAME_MAX+1];   
}

struct __dirstream
  {
    void *__fd;                        
    char *__data;                
    int __entry_data;                
    char *__ptr;                
    int __entry_ptr;                
    size_t __allocation;        
    size_t __size;                
    __libc_lock_define (, __lock) 
  };
typedef struct __dirstream DIR;

2. Sample program
Where the program does not support the file type (d_type) in win, you can judge the file type according to the suffix of the file name; Linux can use d_type directly to determine whether it is a directory or a file.

#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <stdio.h>
int main(){
    DIR    *dir;
    struct    dirent    *ptr;
    dir = opendir("."); ///open the dir
    while((ptr = readdir(dir)) != NULL) ///read the list of this dir
    {
        #ifdef _WIN32
            printf("d_name: %sn", ptr->d_name);
        #endif
        #ifdef __linux
            printf("d_type:%d d_name: %sn", ptr->d_type,ptr->d_name);
        #endif
    }
    closedir(dir);
    return 0;
}

Program output:
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