creating directories using c functions???

[samreen]

i want to create and access directories using C functions...... .......could u please help me out regarding this....

[Guy Lusilao]

You must have this header in your file
#include <stdlib.h>
and use this command in your c++ /C code to create a directory
system("mkdir MYDIRECTORY");
where MYDIRECTORY is the name of your directory
and to access this directory, just do
system("chdir MYDIRECTORY");

[samreen]

You must have this header in your file
#include <stdlib.h>
and use this command in your c++ /C code to create a directory
system("mkdir MYDIRECTORY");
where MYDIRECTORY is the name of your directory
and to access this directory, just do
system("chdir MYDIRECTORY");

hi,
thankx i tried it out, but i'm not able to figure out how can i create file in this directory or how can i list or determine how many files exist in a particular directory using C....please help out

[Jai Vrat Singh]

a small sample.. use it to count or to print :)

int printFiles(char * dirname){

     DIR* dirp;
     dirp = opendir(dirname);
     struct dirent * dp=0;
     int i=0;
     while (dirp) {
     i++;
     std::cout<<" In while loop "<<i<<std::endl;
         errno = 0;
         if ((dp = readdir(dirp)) != NULL) {
           std::string curr(dp->d_name);
           std::cout<<" dp->d_name = "<<curr<<std::endl;
         } else {
           break;
         }
     }
     closedir(dirp);

     return 0;
}

int countFiles(char * dirname){

     DIR* dirp;
     dirp = opendir(dirname);
     struct dirent * dp=0;
     int i=0;
     while (dirp) {
      i++;
      if ((dp = readdir(dirp)) == NULL) break;
     }
     closedir(dirp);

     return i;
}

I have written this hastily ..please test for bugs...

[Jai Vrat Singh]

Full code:

     1  #include<iostream>
     2  #include<cstdio>
     3  #include <sys/types.h>
     4  #include <dirent.h>
     5  #include <cstdlib>
     6  #include <cerrno>
     7
     8  int printFiles(char * dirname);
     9  int countFiles(char * dirname);
    10  int main( int argc, char *argv[]){
    11
    12  printf("argv[1] is %s\n",argv[1]);
    13  printFiles( argv[1]);
    14  printf("Number of files in %s is %d\n",argv[1],countFiles(argv[1]));
    15  return(0);
    16  } 
    17
    18  int printFiles(char * dirname){
    19
    20       DIR* dirp;
    21       dirp = opendir(dirname);
    22       struct dirent * dp=0;
    23       int i=0;
    24       while (dirp) {
    25       i++;
    26       std::cout<<" In while loop "<<i<<std::endl;
    27           errno = 0;
    28           if ((dp = readdir(dirp)) != NULL) {
    29             std::string curr(dp->d_name);
    30             std::cout<<" dp->d_name = "<<curr<<std::endl;
    31           } else {
    32             break;
    33           }
    34       }
    35       closedir(dirp);
    36           
    37       return 0;
    38  }
    39
    40  int countFiles(char * dirname){
    41
    42       DIR* dirp;
    43       dirp = opendir(dirname);
    44       struct dirent * dp=0;
    45       int i=0;
    46       while (dirp) {
    47        i++;
    48        if ((dp = readdir(dirp)) == NULL) break;
    49       }
    50       closedir(dirp);
    51           
    52       return i;
    53  }