CODEWITHSUNDEEP
cjson
BarryBones41
BarryBones41

Reputation: 1481

Extracting jansson JSON data

I am using the C jansson library http://www.digip.org/jansson/

It's quite easy to use https://jansson.readthedocs.org/en/2.7/tutorial.html#the-program

But I cannot get a simple int out of my JSON string. I can successfully receive and load a string of JSON (as in I get no errors, nothing is null) but when I use the jansson get functions to get an int, my int is always 0 even though using steps and breakpoints, the jansson function process an in is not returning 0.

The JSON string looks like this:

{"type":3}

Here is the code:

static void foo(json_t *jsonRoot) {
    // json root is error checked even before this, and is not null
    if (jsonRoot == NULL) {
        return;
    }

    // Trying to get type = 3
    json_t *j_type;
    int type = 0;

    j_type = json_object_get(jsonRoot, "type");
    if (!json_is_integer(j_type)) {
        printf("Not an int!\n");
        return;
    } else {
        // I get in to the else
        // json_integer_value has a its own internal check and 
        // will return 0 if the value is not an int, but it is not 
        // returning 0. It is running the macro json_to_integer(json)->value
        type = json_integer_value(j_type);
    }

    printf("type is %d\n", type);
    // type is 0
}

Upvotes: 1

Views: 2099

Answers (1)

BarryBones41
BarryBones41

Reputation: 1481

My issue was with strtoll. I had to redefine it.

Upvotes: 1

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