Help in extracting data with command from file in C - Page 2 - High Level Programming

shamrock · #8 03-20-2008

Quote:

Originally Posted by ahjiefreak

Hi,

I am executing just by ./binary.exe testfile.txt

where testfile.txt is the filename (contain the number of bits) in the binary.c (2nd argument) passed through argv.

If you are passing a single argument to ./binary.exe then strcpy should have argv[1] as the 2nd argument instead of argv[2].

Code:

strcpy(filename, argv[1]);

ramen_noodle · #9 03-20-2008

Here's another approach but it's not really pretty.

Code:

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

#define BSZ 256
#define MAXLINES 5000
#define READLEN 12


int *retData(int num, int offs, char *data, int delim, void *ptr) {
int *retarr = ptr;
char *read_d;

                    if (offs >= num) {return retarr;}
                    if (retarr == NULL) {retarr = malloc(num * sizeof(int)); bzero(retarr,num);}
 
                    
                    if ( (read_d = index(data,delim)) == NULL) {
                        sscanf(data,"%d",&retarr[offs]);
                        return retarr;
                    } else {
                        sscanf(data,"%d",&retarr[offs]);
                        data = read_d + 1;
                    }

                    printf("Debug: Returning data at %p = %d at iteration %d of %d\nData = %p = %s\n",&retarr[offs],retarr[offs],offs,num,data,data);
                    return retData(num,(offs + 1),data,delim,(void *)retarr);
}

int main(int argc, char **argv) {
int x = 0, n, g;
char buf[BSZ];
int *arr[MAXLINES];
FILE *fpt;

         if (argc != 2) {printf("Please specify a filename.\n"); return 1;}
         
         if ( (fpt = fopen(argv[1],"r")) == NULL) {
            printf("Could not access filename %s.\n",argv[1]);
            return 1;
         }

         while (fgets(buf,BSZ,fpt) != NULL) {
               arr[x++] = retData(READLEN,0,buf,',',NULL);
               printf("Node pointer at %p and returned pointer = %p\n",&arr[x],arr[x]);
               if (x == (MAXLINES - 1)) {break;}
         }
         fclose(fpt);

         for (n = 0 ; n < x ; n++) {
             printf("Array node pointer at %p.\n",&arr[n]);
                for (g = 0 ; g < READLEN ; g++) {
                     printf("Values stored at %p %d = %d\n",&arr[n],n,arr[n][g]);
                }
             free(arr[n]);
          }
          return 0;
}

ahjiefreak · #10 03-20-2008

Hi,

I managed to get them corrected and its running. Thanks alot.

However, I have another question; given that I need to generate alot of these test files. I have a fopen function in my separate main code which write numbers to these file. But I wanted to differentiate these file number.

Do you aware how could we insert number variable in fopen command?
Assume that I have a counter of size 100 whether each round i need to execute below.

e.g

Code:

if((cfPtr = fopen("test%d.txt","a+"))==NULL)
        	               printf("File could not be opened\n");
                else fprintf(cfPtr, "%d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d \n", a,b,c,d...);

So that each time the variable counter loops,it will write on different file?

e.g test1, test2,test3.txt...etc. for each different counter counts.

Please advise.

ramen_noodle · #11 03-20-2008

Use sprintf or strcat and a counter.

Code:

for (i=0 ; i < filecnt ; i++) {
    sprintf(buf,"%s%d.txt",basefilename,i);
    filearr[i] = fopen(buf,"r");
}

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