Question

我已经尝试过这段代码并且有效，但我不明白如何使用Qt获取json并转换为数组或列表。我的代码：

QEventLoop eventLoop;


QNetworkAccessManager mgr;
QObject::connect(&mgr, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));


QNetworkRequest req(QUrl(QString("http://myurljson.com/getjson")));

QNetworkReply *reply = mgr.get(req);
eventLoop.exec(); // blocks stack until "finished()" has been called

if (reply->error() == QNetworkReply::NoError) {

    QString strReply = (QString)reply->readAll();    

    qDebug() << "Response:" << strReply;

    QJsonDocument jsonResponse = QJsonDocument::fromJson(strReply.toUtf8());
    QJsonObject jsonObj = jsonResponse.object();

    qDebug() << "test:" << jsonObj["MCC_Dealer"].toString();
    qDebug() << "test1:" << jsonObj["MCC_User"].toString();

    delete reply;
}
else {
    //failure
    qDebug() << "Failure" <<reply->errorString();
    delete reply;
}

我的json get（来自url的3条记录）：

[{＆＃34; MCC_Dealer＆＃34;：＆＃39;测试＆＃39;＆＃34; MCC_User＆＃34;：＆＃39;测试＆＃39;＆＃34; CurrentDealer＆＃34 ;: ＆＃39;测试＆＃39;＆＃34; CurrentUser＆＃34;：＆＃39;测试＆＃39;}，{＆＃34; MCC_Dealer＆＃34;：＆＃39;测试＆＃39;＆＃34 ; MCC_User＆＃34;：＆＃39;测试＆＃39;＆＃34; CurrentDealer＆＃34;：＆＃39;测试＆＃39;＆＃34; CurrentUser＆＃34;：＆＃39;测试＆＃39; }，{＆＃34; MCC_Dealer＆＃34;：＆＃39;测试＆＃39;＆＃34; MCC_User＆＃34;：＆＃39;测试＆＃39;＆＃34; CurrentDealer＆＃34;：＆＃ 39;测试＆＃39;＆＃34; CurrentUser＆＃34;：＆＃39;测试＆＃39;}]

我需要获取json并在列表或数组中设置。我的目标是用c ++和Qt转换数组或列表中的json响应。有什么想法吗？

由于

Answer 1

正如我在评论中提到的，您的JSON响应已经是一个数组，因此您无需创建其他结构来存储您获得的数据。要对数据进行反序列化，您可以执行以下操作：

[..]
QJsonArray jsonArray = jsonResponse.array();

for (auto it = jsonArray.constBegin(); it != jsonArray.constEnd(); ++it)
{
    const QJsonValue &val = *it;

    // We expect that array contains objects like:
    // {"MCC_Dealer":'test',"MCC_User":'test',"CurrentDealer":'test',"CurrentUser":'test'}
    QJsonObject o = val.toObject();

    // Iterate over all sub-objects. They all have string values.
    for (auto oIt = o.constBegin(); oIt != o.constEnd(); ++oIt)
    {
        // "MCC_Dealer":'test'
        qDebug() << "Key:" << oIt.key() << ", Value:" << oIt.value().toString();
    }
}

QJsonDocument在c ++中列出或数组

1 个答案: