How I can add more than one QJsonObject to a QJsonDocument

Question

I want to add more than one QJsonObject to a QJsonDocument. Is this possible?

It should look like this:

[
    {
        "objID": "obj1"
        //... Some other parameter
    },
    {
        "objID": "obj2"
        //...Some other parameter
    }
]

I tried this:

QJsonDocument(obj1).toJson(QJsonDocument::Compact);
QJsonDocument(obj2).toJson(QJsonDocument::Compact);

But it produces invalid JSON.

I want to write Json file in below format. Is it possible? { { "objID": "obj1" //... Some other parameter }, { "objID": "obj2" //...Some other parameter } } — AB Bolim, Mar 16 '19 at 05:38

puetzk · Accepted Answer · 2018-08-02T14:07:50.793

8

A JSON document has only one root value. In the example you gave, that value is an array, which contains two objects

To get that in Qt, you'd say:

QJsonArray array;
array << obj1;
array << obj2;
QJsonDocument(array).toJson(QJsonDocument::Compact);

edited Aug 02 '18 at 14:07

answered Aug 20 '14 at 18:08

puetzk

I want to write Json file in below format. Is it possible? `{ { "objID": "obj1" //... Some other parameter }, { "objID": "obj2" //...Some other parameter } }` – AB Bolim Mar 15 '19 at 12:38
That is not (valid) JSON; the {} means objects, which have to be { name: value, ...}. You could get [ { "objID": "obj1" //... Some other parameter }, { "objID": "obj2" //...Some other parameter } ], which would be an array of objects. – puetzk Mar 20 '19 at 22:16
Its a valid Json file. Json file may contain JArray, JObject or both. You can refer [this](https://stackoverflow.com/questions/55193946/how-i-can-add-more-than-one-qjsonobject-to-a-qjsondocument-qt) for more info. – AB Bolim Mar 27 '19 at 06:39
That one is valid: it has key names. Jobject has to be { name1: value1, name2: value2 }. Theirs has placeholder names "Obj1", "Obj2", and meets this. Yours asked for { value1, value2 }, which is not valid. – puetzk Apr 01 '19 at 14:34
I haven't ask for { value1, value2 } ? It may be you misunderstood my problem. – AB Bolim Apr 02 '19 at 07:07

1 Answers1