Reading complicated format string with fscanf

Question

I have a kindof complicated file format:

{
      "color": [
        45, 
        200, 
        34
      ], 
      "docnum": 5183, 
      "form": "avoir", 
      "graph": "jdm.N.flat", 
      "id": 0, 
      "lang": "fr", 
      "neighbors": 17, 
      "pos": "N", 
      "pzero": true, 
      "rank": 1, 
      "score": 0.0028284271, 
      "type": 1
    }, 
    {
      "color": [
        45, 
        200, 
        34
      ], 
      "docnum": 22809, 
      "form": "argent", 
      "graph": "jdm.N.flat", 
      "id": 1, 
      "lang": "fr", 
      "neighbors": 65, 
      "pos": "N", 
      "pzero": false, 
      "rank": 2, 
      "score": 0.0028284271, 
      "type": 1
    },

This kind of list goes on, for hundreds of entries. I would like to read in the variable numbers, and a string (docnum, form, id, neighbors, rank, score) so i created a format string for this kind of input:

     main(){

     FILE* in=fopen("fr.N.bien2","r");
     int maxwords=100;
     int maxstringlen=100;

     char* nodes=malloc(sizeof(char)*maxstringlen*maxwords);
     if(!nodes){printf("Nodes couldn't be allocated!\n");}

     int i=0;

     int* IDs=malloc(sizeof(int)*3*maxwords);
     int docnum,nei,rank;
     float score;
     char* pzero;
     while(fscanf(in," { \"color\": [ 45, 200, 34 ], \"docnum\": %i,      \"form\": %s \"graph\": \"jdm.N.flat\", \"id\": %i , \"lang\": \"fr\",  \"neighbors\": %i , \"pos\": \"N\", \"pzero\": false, \"rank\": %i , \"score\": %f , \"type\" :1  },",&docnum,&nodes[i],&IDs[i],&nei,pzero,&rank,&score))
    {
         printf("node:%s,ID=%i\n",&nodes[i],IDs[i]);
         i++;
   }
   }

It looks complicated, but it seems to be working, because I get the first instance right. The output is:

>>node:"avoir",,ID=0

However, output stops at that, even though the format is exactly repeating in the file (as you can see in the sample). Am I missing something important here? Is there an easier way to read in this kind of data from such a file?

That looks like a [JSON](https://en.wikipedia.org/wiki/JSON) object, and that you can't really parse easily with only `scanf` and family. Instead search for a JSON library. — Some programmer dude, Apr 10 '16 at 15:27
" it seems to be working, because I get the first instance right" - Famous last words of a software developer who did not properly test. — too honest for this site, Apr 10 '16 at 15:37

score 1 · Answer 1 · edited May 23 '17 at 11:50

1

And this complicated format is JSON

As the comments suggest, look for a library instead (they can be found following the previous link) there's many libraries and for different languages as well.

In fact, your question might be already answered here

edited May 23 '17 at 11:50

Community

1
1

answered Apr 10 '16 at 15:43

Eekan

71
1
9

Reading complicated format string with fscanf

1 Answers1