yajl_tree_get return 0 when path node name is the same

Question

here is the JSON text:

{
    "retcode": 0,
    "result": {
        "info": [{
            "face": 180,
            "flag": 8913472,
            "nick": "tom",
            "uin": 2951718842
        }, {
            "face": 252,
            "flag": 512,
            "nick": "jim",
            "uin": 824317252
        }, {
            "face": 0,
            "flag": 17302018,
            "nick": "hanmeimei",
            "uin": 1179162105
        }, {
            "face": 522,
            "flag": 4719104,
            "nick": "lilei",
            "uin": 108219029
        }]
    }
}

below is the function to get "nick" node of the JSON text

char* getNickName()
{
    char* path[20] = { "result", "info", "nick", (char *) 0 }; 
    yajl_val v;
    yajl_val node;
    node = yajl_tree_parse(buffer, errbuf, sizeof(errbuf));
    v = yajl_tree_get(node, path, yajl_t_string);
    return YAJL_GET_STRING(v);
}

function getNickName should return lilei or similar stuff but in fact it always return 0.

as there is not only one node named "nick", so how can yajl parse "nick" one by one ?

how can I get the value like tom , jim etc.

Answer 1

You need get info array firstly. then traversal the array.

char* path[20] = { "result", "info", (char *) 0 }; 
yajl_val v;
yajl_val info;
info = yajl_tree_parse(buffer, errbuf, sizeof(errbuf));
if (info && YAJL_IS_ARRAY(info)) {
    size_t len = info->u.array.len;
    for(int i = 0;i < len; i++) {
        const char *n_path[] = {"nick",(const char *)0};
        yajl_val n = yajl_tree_get(f,n_path,yajl_t_string);

        // here is what you need
        char *nickname = YAJL_GET_STRING(n);

}

DONE