Generally, in many development technologies, we will be adding JSON api to project or provided by OS itself and parse the appropriate response using JSON API's. Here it is a different approach.
- Convert JSON response to QVariant using JsonDataAccess.
- Query the QVariant object for JSON children Nodes.
[
{
"id": "13",
"en_description": "If leadership does not keep",
"ar_description": "\u0625\u0646 \u0627",
"date": "2012-09-28"
},
{
"id": "14",
"en_description": "The role of the leadership",
"ar_description": "\u062f\u0648\u0631 \u0627",
"date": "2012-09-28"
}
]
In the above Json, I am likely to parse the data of "en_descreption" tag. The method to parse is shown below.
void Quotes::onUrlLoad(QString jsonResponse) { ArrayDataModel *arrayDataModel = new ArrayDataModel(); // Convert Json file into QTList objects. bb::data::JsonDataAccess ja; const QVariant jsonva = ja.loadFromBuffer(jsonResponse); const QListexternalip = jsonva.toList(); // Iterate Json List and retrieve data, store it in ArraydataModel for (int index = 0; index < externalip.size(); index++) { QVariantMap map = externalip.at(index).toMap(); QVariantMap::Iterator iterator = map.begin(); while (iterator != map.end()) { // Append "en_descreption" tag's value to the ArrayDataModel. if (!iterator.key().toStdString().compare("en_description")) { arrayDataModel->append(iterator.value().toString()); } ++iterator; } // end while. } // end for }
Above code does the following things
- Loads Json string using JsonDataAcces.
- Converts the Json String to root QVariant object with the help of JsonDataAccess.
- Get the List of QVariant variables from the root QVariant variable . Note that as our JSON is an array hence we are using jsonva.toList(). Otherwise we have to use jsonva.toMap() as per documentation.
- Pull each QVariantMap from the list.
- Iterate the map for the values.
- Extract values with "en_description" and store it in ArrayDataModel.
That's it .. we are done with parsing and storing JSON data.
