Question

I am using Code::Blocks and have set the command-line arugments via the IDE. I have also opened the executable with the proper argument and I can’t manage to get a non-NULL on fopen() return. I’ve tried hard-coding the filename also with no success. The platform is Windows XP SP3.

The first is the one that fails, when i hardcoded it i used double backlash. Also i never knew if the second works because i never managed to start the process by opening the first one.

Obviously i put the text file in the same directory that the executable and rebuilt the executable many times, but it still doesn’t work.

EDIT: I added the perror(“fopen”); line in the if(finput==NULL) block. This is the output.

http://prntscr.com/h71pa

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define first_part_url "[url=http://magiccards.info/query?q="
#define second_part_url "&v=card&s=cname]"
#define end_bracket "[/url]\n"
#define output_file_prefix "output_"

char* get_card(FILE* finput);

int main(int n, char* arguments[])
{
FILE* finput;
FILE* foutput;
short int counter;
char* output_filename;
char* finalstring;


for(counter=1; counter<n; counter++)
{
    finput=fopen(arguments[counter], "r");

    if (finput==NULL)
    {
        printf("Unable to open ");
        puts(arguments[counter]);
                    perror("fopen");
        break;
    }

    strcpy(output_filename, output_file_prefix);
    strcat(output_filename, arguments[counter]);

    if((foutput=fopen(output_filename, "w"))==NULL)
    {
        printf("There was an error while trying to open ");
        puts(arguments[counter]);
        printf(" .\n");
        break;
    }

    while(!feof(finput))
    {
    finalstring=get_card(finput);
    fputs(finalstring, foutput);
    while(((fgetc(finput))!='\n')||feof(finput));
    }

    printf("Autocarding ");
    puts(arguments[counter]);
    printf(" was a success.\n");
    fclose(foutput);
}

if(finput!=NULL)
{
fclose(finput);
free(finalstring);
}
return 0;
}

char* get_card(FILE* finput)
{
char* currentcard;
char* finalstring;

currentcard=(char*)malloc(sizeof(char)*150);
fgets(currentcard, 150, finput);

/* Allocates the exact amount of space needed for the final string*/
finalstring=(char*)malloc(sizeof(char)*(strlen(first_part_url)+strlen(second_part_url)+strlen(end_bracket)+strlen(currentcard)));

/* Get all the final forum link together*/
strcat(finalstring, first_part_url);
strcat(finalstring, currentcard);
strcat(finalstring, second_part_url);
strcat(finalstring, end_bracket);

free(currentcard);

return finalstring;
}

Answer 1

The error you are getting, “No such file or directory” indicates that the file name you’re trying to open doesn’t exist.

In this case, it’s probably because the program’s current working directory is not the same as the directory containing the executable file.