Thread: searching for/creating a file in a user-specified folder

hi,

i am writing a simple program whereby the user is asked to key in the full path of a folder, and then the program is to search for a file with a particular name, open it for processing, and then to create an output file with a fixed name in that same folder. for instance, the program may look for a file named 'image' and output something like 'processed_image'.

are there some straightforward codes to do that? thanks!

Originally Posted by bored_guy

hi,

i am writing a simple program whereby the user is asked to key in the full path of a folder, and then the program is to search for a file with a particular name, open it for processing, and then to create an output file with a fixed name in that same folder. for instance, the program may look for a file named 'image' and output something like 'processed_image'.

are there some straightforward codes to do that? thanks!

There are various file handling functions in C. Usually including something akin to <dir.h> that has these functions.

I haven't used them, so I can't advise you on them. Here's a "roll your own" approach:

Code:

#include <stdio.h>


int main() {
  FILE *fp;
  char fullFileName[100];
  int i;   

  fgets(fullFileName, sizeof(fullFileName), stdin);
  /* e.g.: C:\TC\file_get.txt<enter>
  i = 99;
  while(i > -1) {   //must strip off the newline on the end
    if(fullFileName[i] == '\n')
      fullFileName[i] = '\0';  //and properly adjust the string
    --i;
  }

  if((fp = fopen(fullFileName, "rt"))==NULL) {
    perror("Error opening fullFileName");
    return 1;
  }
  while((fgets(fullFileName, sizeof(fullFileName), fp)) != NULL)
    printf("\n\n\n %s", fullFileName);

  i = getchar(); ++i;
  return 0;
}

You know you're getting off very easy here. Next time, be prepared to show some code, partner.