QJson解析数据基本用法

#include <QJsonParseError>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>

...

QString str = "{\"errno\":0,\"errmsg\":\"\",\"data\":{\"appid\":\"134304921\",\"rid\":-58474238,\"sign\":\"a9a6dee9633e76c3e21253cbd65ea361\",\"authType\":\"3\",\"ts\":1477290743000,\"chat_addr_list\":[\"54.222.202.135:443\",\"54.222.183.38:443\"]}}";

QJsonParseError jsonError;
QJsonDocument jsonDoc = QJsonDocument::fromJson(str.toLatin1(), &jsonError);

if(jsonError.error == QJsonParseError::NoError)
{
if(jsonDoc.isObject())
{
QJsonObject obj = jsonDoc.object();

if(obj.contains("data"))
{
QJsonValue value= obj.take("data");
if(value.isObject())
{
qDebug()<< "data is object";
QJsonObject dataObj = value.toObject();

qDebug() << QString(QJsonDocument(dataObj).toJson());

if(dataObj.contains("appid"))
{
dataObj.take("appid").toString();
}
if(dataObj.contains("chat_addr_list"))
{
QJsonValue value_list = dataObj.take("chat_addr_list");
if(value_list.isArray())
{
QJsonArray arr = value_list.toArray();
qDebug() << arr.size();
for(int i = 0; i < arr.size(); i++)
{
QJsonValue value = arr.at(i);
if(value.isString())
qDebug() << value.toString();
}
}
}
}
}
//            if(obj.contains("errno"))
}
}