使用C計算目錄中文件的數量C

Question

如何在Linux平臺上使用C計算目錄中的文件數量。

Answer 1

不能保證此代碼編譯，它真的只與Linux和BSD系統兼容：

#include <dirent.h> 

... 

int file_count = 0; 
DIR * dirp; 
struct dirent * entry; 

dirp = opendir("path"); /* There should be error handling after this */ 
while ((entry = readdir(dirp)) != NULL) { 
    if (entry->d_type == DT_REG) { /* If the entry is a regular file */ 
     file_count++; 
    } 
} 
closedir(dirp); 

Answer 2

參見readdir。

Answer 3

如果你不關心當前目錄.和這樣的人的父目錄..：

drwxr-xr-x 3 michi michi  4096 Dec 21 15:54 . 
drwx------ 30 michi michi  12288 Jan 3 10:23 .. 

你可以做這樣的事情：

#include <stdio.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <dirent.h> 
#include <string.h> 
#include <stdlib.h> 
#include <unistd.h> 

int main (void){ 
    size_t count = 0; 
    struct dirent *res; 
    struct stat sb; 
    const char *path = "/home/michi/"; 

    if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)){ 
     DIR *folder = opendir (path); 

     if (access (path, F_OK) != -1){ 
      if (folder){ 
       while ((res = readdir (folder))){ 
        if (strcmp(res->d_name, ".") && strcmp(res->d_name, "..")){ 
         printf("%zu) - %s\n", count + 1, res->d_name); 
         count++; 
        } 
       } 

       closedir (folder); 
      }else{ 
       perror ("Could not open the directory"); 
       exit(EXIT_FAILURE); 
      } 
     } 

    }else{ 
     printf("The %s it cannot be opened or is not a directory\n", path); 
     exit(EXIT_FAILURE); 
    } 

    printf("\n\tFound %zu Files\n", count); 
} 

輸出：

1) - .gnome2 
2) - .linuxmint 
3) - .xsession-errors 
4) - .nano 
5) - .kde 
6) - .xsession-errors.old 
7) - .gnome2_private 
8) - Public 
9) - .gconf 
10) - .bashrc 
11) - .macromedia 
12) - .thunderbird 
13) - Pictures 
14) - .profile 
15) - .cinnamon 
16) - .pki 
17) - Compile 
18) - Desktop 
19) - .Private 
20) - .cache 
21) - .Xauthority 
22) - .ICEauthority 
23) - VirtualBox VMs 
24) - .bash_history 
25) - .mozilla 
26) - .local 
27) - .config 
28) - .codeblocks 
29) - Documents 
30) - .bash_logout 
31) - Videos 
32) - Templates 
33) - Downloads 
34) - .adobe 
35) - .gphoto 
36) - Music 
37) - .dbus 
38) - .ecryptfs 
39) - .sudo_as_admin_successful 
40) - .gnome 

    Found 40 Files