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Linux下C语言遍历文件夹
学习了LINUX下用C语言遍历文件夹，一些心得
struct dirent中的几个成员：
d_type：4表示为目录，8表示为文件
d_reclen：16表示子目录或文件，24表示非子目录
经过本人亲自试验发现：d_reclen：16表示子目录或以.开头的隐藏文件，24表示普通文本文件，28为二进制文件，等等
d_name：目录或文件的名称
具体代码如下，仅供参考
#include <stdio.h>
#include <dirent.h>
#include <sys/stat.h>
void List(char *path)
{
     struct dirent* ent = NULL;
     DIR *pDir;
     pDir=opendir(path);
     while (NULL != (ent=readdir(pDir)))
     {
         if (ent->d_reclen==24)
         {
             if (ent->d_type==8)
             {
                 printf("普通文件:%s\n", ent->d_name);
             }
             else
             {
                 printf("子目录：%s\n",ent->d_name);
                 List(ent->d_name);
                 printf("返回%s\n",ent->d_name);
             }
         }
     }
}

int main(int argc, char *argv[])
{
      List(argv[1]);
      return 0;
}
上面函数修改后：
void List(char *path)
{
     printf("路径为[%s]\n", path);
     
     struct dirent* ent = NULL;
     DIR *pDir;
     pDir=opendir(path);
     //d_reclen：16表示子目录或以.开头的隐藏文件，24表示普通文本文件,28为二进制文件，还有其他……
     while (NULL != (ent=readdir(pDir)))
     {
         printf("reclen=%d    type=%d\t", ent->d_reclen, ent->d_type);
         if (ent->d_reclen==24)
         {    
             //d_type：4表示为目录，8表示为文件
             if (ent->d_type==8)
             {
                 printf("普通文件[%s]\n", ent->d_name);
             }
         }
         else if(ent->d_reclen==16)
         {
             printf("[.]开头的子目录或隐藏文件[%s]\n",ent->d_name);
         }
         else
         {
             printf("其他文件[%s]\n", ent->d_name);
         }
     }
}
转CU，地址：
http://blog.chinaunix.net/u/29024/showart_484896.html
#include   <stdio.h>   
#include   <dirent.h>   
#include   <sys/types.h>   
#include   <sys/stat.h>    
void dir_scan(char   *path,   char   *file);   
int count = 0;   
int main(int   argc,   char   *argv[])   
{   
                   struct   stat   s;   
     
                   if(argc   !=   2){   
                                   printf("one   direction   requried\n");   
                                   exit(1);   
                   }   
                   if(lstat(argv[1],   &s)   <   0){   
                                   printf("lstat   error\n");   
                                   exit(2);   
                   }   
                  //判断一个路径是否是目录
                   if(!S_ISDIR(s.st_mode)){   
                                   printf("%s   is   not   a   direction   name\n",   argv[1]);   
                                   exit(3);   
                   }   
                   dir_scan("",   argv[1]);   
     
                   printf("total:   %d   files\n",   count);   
     
                   exit(0);   
}   
void   dir_scan(char   *path,   char   *file)   
{   
                   struct   stat   s;   
                   DIR           *dir;   
                   struct   dirent   *dt;   
                   char   dirname[50];      
                   memset(dirname,   0,   50*sizeof(char));   
                   strcpy(dirname,   path);    
                   if(lstat(file,   &s)   <   0){   
                                   printf("lstat   error\n");   
                   }   
                   if(S_ISDIR(s.st_mode)){   
                                   strcpy(dirname+strlen(dirname),   file);   
                                   strcpy(dirname+strlen(dirname),   "/");   
                                   if((dir   =   opendir(file))   ==   NULL){   
                                                   printf("opendir   %s/%s   error\n");   
                                                   exit(4);   
                                   }   
                                   if(chdir(file)   <   0)   {   
                                                   printf("chdir   error\n");   
                                                   exit(5);   
                                   }   
                                   while((dt   =   readdir(dir))   !=   NULL){   
                                                   if(dt->d_name[0]   ==   '.'){   
                                                                   continue;   
                                                   }   
     
                                                   dir_scan(dirname,   dt->d_name);   
                                   }   
                                   if(chdir("..")   <   0){   
                                                   printf("chdir   error\n");   
                                                   exit(6);   
                                   }   
                   }else{   
                                   printf("%s%s\n",   dirname,   file);   
                                   count++;   
                   }   
}
linux c 下如何获得目录下的文件数目。
int main(int argc, char **argv)
{    
      DIR  * pdir;
     struct dirent * pdirent;
     struct stat f_ftime;
     int fcnt;/*文件数目统计*/
      pdir=opendir("./");
     if(pdir==NULL)
     {      return(-1);    }
      fcnt=0;
     for(pdirent=readdir(pdir);pdirent!=NULL;pdirent=readdir(pdir))
     {
       if(strcmp(pdirent->d_name,".")==0||strcmp(pdirent->d_name,"..")==0) continue;
       if(stat(pdirent->d_name,&f_ftime)!=0) return -1 ;
       if(S_ISDIR(f_ftime.st_mode)) continue; /*子目录跳过*/
        fcnt++;  
       printf("文件:%s\n",pdirent->d_name);
     }
     printf("文件总数%d\n",fcnt);
      closedir(pdir);
     return 0; 
}

#include <unistd.h>  
#include <stdio.h>  
#include <dirent.h>  
#include <string.h>  
#include <sys/stat.h>   
void printdir(char *dir, int depth) 
{ 
          DIR *dp; 
          struct dirent *entry; 
          struct stat statbuf; 
   
          if((dp = opendir(dir)) == NULL) { 
                      fprintf(stderr, "cannot open directory: %s\n ", dir); 
                      return; 
          } 
          chdir(dir); 
          while((entry = readdir(dp)) != NULL) { 
                      lstat(entry-> d_name,&statbuf); 
                      if(S_ISDIR(statbuf.st_mode)) { 
                                  /**//* Found a directory, but ignore . and .. */ 
                                  if(strcmp( ". ",entry-> d_name) == 0 || 
                                              strcmp( ".. ",entry-> d_name) == 0) 
                                              continue; 
                                  printf( "%*s%s/\n ",depth, " ",entry-> d_name); 
                                  /**//* Recurse at a new indent level */ 
                                  printdir(entry-> d_name,depth+4); 
                      } 
                      else printf( "%*s%s\n ",depth, " ",entry-> d_name); 
          } 
          chdir( ".. "); 
          closedir(dp); 
} 
   
/**//*    Now we move onto the main function.    */ 
int main(int argc, char* argv[]) 
{ 
          char *topdir, pwd[2]= ". "; 
          if (argc != 2) 
                      topdir=pwd; 
          else 
                      topdir=argv[1]; 
   
          printf( "Directory scan of %s\n ",topdir); 
          printdir(topdir,0); 
          printf( "done.\n "); 
   
          exit(0); 
}