CODEWITHSUNDEEP
cocos2d-xrapidjson
Zenslainer
Zenslainer

Reputation: 159

RapidJson : How to get all Key_names from a JSON? (cocos2dx)

From a Json string (or file), I want to collect key/value pairs without knowing the keys in advance. Let's say I have this Json:

{ "a":"1","b":"2","c":"3" }

I'd like to collect all key strings "a" , "b" , "c" , "d" and their respective values. BTW: I use rapidjson integration in Cocos2dX 3.3. Any idea?

What I'm on now is to use :

rapidjson::Document JSON; 

//..... collecting the JSON .... then

for (rapidjson::Value::MemberIterator M=JSON.MemberonBegin(); M!=JSON.MemberonEnd(); M++)
{
    //..... I have access to M->name and M->value here
    //..... but I don't know how to convert them to std::string or const char*
}

But I'm stuck with that.

Upvotes: 2

Views: 5440

Answers (1)

Zenslainer
Zenslainer

Reputation: 159

I've just figured out that rapidjson::Value::MemberIterator has functions in it. So here is an example to enumerate key/pairs from a Json document. This example only log root keys. You will need extra work to retrieve sub-keys

const char *jsonbuf = "{\"a\":\"1\",\"b\":\"2\",\"c\":\"3\"}";

rapidjson::Document                 JSON;
rapidjson::Value::MemberIterator    M;
const char                          *key,*value;

JSON.Parse<0>(jsonbuf);

if (JSON.HasParseError())
{
    CCLOG("Json has errors!!!");
    return;
}

for (M=JSON.MemberonBegin(); M!=JSON.MemberonEnd(); M++)
{
    key   = M->name.GetString();
    value = M->value.GetString();

    if (key!=NULL && value!=NULL)
    {
        CCLOG("%s = %s", key,value);
    }
}

Upvotes: 5

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