[SOLVED]parse Json in Qt5

[4j1th]

I want parse a json and add it into sqlite, this json file parse from php

test.json
[{"name":"ugiuiug","dob":"0000-00-00"},{"name":"jghighui","dob":"0000-00-00"},{"name":"igiyug","dob":"0000-00-00"},{"name":"jhu","dob":"0000-00-00"}]

qt code

    QFile file;
    file.setFileName("test1.json");
    file.open(QIODevice::ReadOnly | QIODevice::Text);
    val = file.readAll();
    file.close();
    QJsonDocument doc = QJsonDocument::fromJson(val.toUtf8());

    //get the jsonObject
    QJsonObject jObject = doc.object();

    //convert the json object to variantmap
    QVariantMap mainMap = jObject.toVariantMap();

    //convert the json object to variantmap
    QVariantMap dataMap = mainMap['0'].toMap();

    qDebug() << dataMap['name'].toString();

but an error produced : invalid user-defined conversion from 'char' to 'const QString&' [-fpermissive]
QVariantMap dataMap = mainMap['1'].toMap();
^

[yeckel]

@4j1th mainMap['1'].toMap(); '1' is character, you would like to use 1 without apostrophes, or "0" (quotation marks) when it's a string. In your case put there just the number: mainMap[1].toMap();

[4j1th]

@yeckel thank you

updated code block

QString val;
    QFile file;
    file.setFileName("test1.json");
    file.open(QIODevice::ReadOnly | QIODevice::Text);
    val = file.readAll();
    file.close();
    QJsonDocument doc = QJsonDocument::fromJson(val.toUtf8());

    //get the jsonObject
    QJsonObject jObject = doc.object();

    //convert the json object to variantmap
    QVariantMap mainMap = jObject.toVariantMap();

    //convert the json object to variantmap
    QVariantMap dataMap = mainMap[1].toMap();

    qDebug() << dataMap["name"].toString();

I tried that too but still got error
error: invalid conversion from 'int' to 'const char*' [-fpermissive]

[yeckel]

@4j1th Aa, sorry I thought you have the array already. mainMap is type of QVariantMap thus it needs QString as a key parameter.

Watch out your json example is not a json. Something like: {"results": [{"name":"ugiuiug","dob":"0000-00-00"},{"name":"jghighui","dob":"0000-00-00"},{"name":"igiyug","dob":"0000-00-00"},{"name":"jhu","dob":"0000-00-00"}]} woud be.

Then:
QVariantMap mainMap = jObject.toVariantMap();
QVariantList localList = mainMap["result"].toList();
QVAriantMap map = localList[0].toMap();
qDebug() << map["name"].toString;

[4j1th]

@yeckel
json file
{"results":[{"name":"ugiuiug","dob":"0000-00-00"},{"name":"jghighui","dob":"0000-00-00"},{"name":"igiyug","dob":"0000-00-00"},{"name":"jhu","dob":"0000-00-00"}]}

qt code

    //get the jsonObject
    QJsonObject jObject = doc.object();

    QVariantMap mainMap = jObject.toVariantMap();
    QVariantList localList = mainMap["result"].toList();    
    QVariantMap map = localList[1].toMap();

    qDebug() << map["name"].toString();

compiled but ASSERT failure in QList<T>::operator[]: "index out of range", file ../../../../Qt5.4.1/5.4/gcc_64/include/QtCore/qlist.h, line 486
The program has unexpectedly finished.

[yeckel]

@4j1th
QJsonParseError jsonError;
QJsonDocument flowerJson = QJsonDocument::fromJson(file.readAll(),&jsonError);
if (jsonError.error != QJsonParseError::NoError){
qDebug() << jsonError.errorString();
}
QList<QVariant> list = flowerJson.toVariant().toList();
QMap<QString, QVariant> map = list[0].toMap();
qDebug() << map["name"].toString();

Has to work.

[4j1th]

@yeckel Thank you very much it's working now

json file

[{"name":"ugiuiug","dob":"0000-00-00"},{"name":"jghighui","dob":"0000-00-00"},{"name":"igiyug","dob":"0000-00-00"},{"name":"jhu","dob":"0000-00-00"}]

Qt code

    QFile file;
    file.setFileName("test1.json");
    file.open(QIODevice::ReadOnly | QIODevice::Text);


    QJsonParseError jsonError;
    QJsonDocument flowerJson = QJsonDocument::fromJson(file.readAll(),&jsonError);
    if (jsonError.error != QJsonParseError::NoError){
    qDebug() << jsonError.errorString();
    }
    QList<QVariant> list = flowerJson.toVariant().toList();
    QMap<QString, QVariant> map = list[0].toMap();
    qDebug() << map["name"].toString();