@jsulm we make an installation file for our combined system, including multiple programs sharing some but not other resources. we use an nsi script to manage this. usually works fine. I just missed updating some of the .dll files.

@Christian-Ehrlicher
ahh, you are right. Good catch.
http://doc.qt.io/qt-5/qjsonvalue.html#toDouble
converts the QJsonValue to double if its that type().
in this case it will return defaultValue (0)

so its something like

QJsonValue bid1 = jsonObj.value("bid_1"); QString asStr=bid1.toString(); double n = asStr.toDouble(); qDebug() << n;

Hi
fast sample.
it need error handling to be useful in real code ! ( dont skip that if for a real program)

#include <QApplication> #include <QDebug> #include <QJsonDocument> #include <QJsonObject> #include <QNetworkReply> #include <QNetworkAccessManager> int main(int argc, char* argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); // if in mainwindow. make sure m_manager lives in .h as member. else it wont work. ( death by scope) QNetworkAccessManager m_manager; // make request QNetworkRequest request = QNetworkRequest(QUrl("https://api.bitmart.com/ticker/BMX_ETH")); QNetworkReply* reply = m_manager.get(request); // connect to signal when its done using lambda) QObject::connect(reply, &QNetworkReply::finished, [reply]() { // read data QString ReplyText = reply->readAll(); // qDebug() << ReplyText; // ask doc to parse it QJsonDocument doc = QJsonDocument::fromJson(ReplyText.toUtf8()); // we know first element in file is object, to try to ask for such QJsonObject obj = doc.object(); // ask object for value QJsonValue value = obj.value(QString("bid_1")); qDebug() << "Bid value is" << value.toString();; reply->deleteLater(); // make sure to clean up }); return a.exec(); }

and it outputs
Bid value is "0.000290"

@Paul-Colby Thanks

i myself did something like this :)

QVariantMap json_map; const QJsonDocument doc = QJsonDocument::fromJson(output); qDebug().noquote() << doc; qDebug().noquote() << doc.array(); foreach (auto value, doc.array()) { qDebug().noquote() << value; qDebug().noquote() << value.toObject(); qDebug().noquote() << value.toObject().value("name"); json_map["name"] = value.toObject().value("name").toString(); json_map["installed"] = value.toObject().value("installed").toBool(); json_map["id"] = value.toObject().value("id").toString(); json_map["filename"] = value.toObject().value("filename").toString(); }

@Saman19
You may want to check out Cutelyst if you want to support the HTTP protocol.

If you do not need to rely on HTTP, but just want to receive JSON (or any custom protocol), take a look at QTcpServer examples.

Thank you guys.

What a wonderful quick responses.

Hi @Geeva,

@Geeva said in JSON with multi tasking:

@JKSH Thanks for solving basic confusion. I have one more doubt also. Here, I have attached program for verification. I hope you can provide a proper solution

You're welcome. I'm happy to teach you basics. However, verifying your program is too difficult to do on a forum.

You need to do 2 things:

Take C++ lessons Practice writing and debugging simple programs for your hardware

Hi @SGaist , no sorry. This was my first try to solve this. It dosn't work because of:

@JNBarchan said:

Once JSON has taken it as a double, it's too late.

With a small test program I testes Qt-JSON: https://github.com/qt-json/qt-json

#include <QCoreApplication> #include <QDebug> #include "json.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QString json = "{\"success\":true,\"message\":\"some-message\",\"number1\":1.234,\"number2\":\"5.678\"}"; bool ok; QtJson::JsonObject result = QtJson::parse(json, ok).toMap(); qDebug() << "number1: " << result["number1"].toString(); qDebug() << "number2: " << result["number2"].toString(); return a.exec(); }

Which gives me the following output:

number1: "1.234" number2: "5.678"

So I think I can work with this library, but a bit sad about the truth, that such a case can't be handled without external libraries.

@Wieland: Thanks!

Thanks again for the explanation. I wish I had more time to learn programming correctly...

Hi,

I am using the one dridk mentioned. The parsing works fine and I use

listModel.append({jsonObject});

to fill my ListView. Everything is in the ListModel besides z.
If I do:

for(var i in jsonObject){ eventModel.append(jsonObject[i]) eventModel.set(i, {"zn":jsonObject[i]["z"][0]}) }

z is added as an array. Just like in the JSON object just without the []-brackets.

Try to triangulate faces of your mesh (select your shape, switch to Edit Mode and press Ctrl+T ).

resolved !!
i've chenged

m_pNetworkAccessManager->get(request);

by

request.setRawHeader("Content-Type", "application/x-www-form-urlencoded"); QByteArray par=""; m_pNetworkAccessManager->post(request,par);

In answer to my original question i did something like this

onUrlChanged: { console.log(searchwebview.url); test_json(); }

and i made this function to parse the returned JSON ( this function is not perfect yet )

function test_json() { var p_url = searchwebview.url var http = new XMLHttpRequest(); var json , parse , text , rev_id; http.onreadystatechange = function(){ if(http.readyState == 4 && http.status == 200) { json = http.responseText; parse = JSON.parse(json); rev_id = parse.parse.revid; console.log(rev_id); text = parse.parse.text["*"]; //console.log(text); // <-- STRIP ME (o.O) while(text.match(/&#39;\/index.php/)){ text = text.replace(/&#39;\/index.php/, "http://en.wikitolearn.org/index.php"); text = text.replace(/&amp;/,"&"); text = text.replace(/MathShowImage&amp;/, "MathShowImage&") text = text.replace(/mode=mathml&#39;/, "mode=mathml\""); text = text.replace(/<meta class="mwe-math-fallback-image-inline" aria-hidden="true" style="background-image: url\(/ ,"<img style=\"background-repeat: no-repeat; background-size: 100% 100%; vertical-align: -0.838ex;height: 2.843ex; \" src=\""); text = text.replace(/<meta class="mwe-math-fallback-image-display" aria-hidden="true" style="background-image: url\(/ ,"<img style=\"background-repeat: no-repeat; background-size: 100% 100%; vertical-align: -0.838ex;height: 2.843ex; \" src=\""); text = text.replace(/&amp;mode=mathml\"/ , "&mode=mathml>\""); text = styling + text; } console.log(text); // after strip :p . webview.loadHtml(text); } }; http.open('GET',p_url); http.send(); }

Crap i mixed 2 codes. Sorry for that :m. Thank you everyone

@Gojir4
Sure, Thanks for your Help.

@Paul-Colby YES!! I can't believe I didn't see it. I guess I didn't read it carefully. Thank you!!!!

@Paul-Colby Thank you

@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();

Not quite understand your question.. Generally speaking, Javascript application use a Promise object for deferred and asynchronous operation. For example , do something when two or more asynchronous operations completed (in any order).

Qt do not bundle any Promise implementation by default. You could get a one from my github repo:

benlau/quickpromise

Example

Promise { resolveWhen: Q.all([endpoint1. onReplyStatusChanged,endpoint2. onReplyStatusChanged]); onFulfilled: { // It will be triggered only if both of the endpoint emitted the signal controller.setData1(); controller.setData2(); } }

@SGaist
Hi SGaist,
i solved manupulating my BA manually
int bW = bitmap.value("width").toInt();
int bH = bitmap.value("height").toInt();
QString shortFileName = bitmap.value("id").toString();
QString fileName = btb::ResourceManager().getClipDir().absolutePath().append("/"+shortFileName+".png");
QByteArray ba = bitmap.value("rect").toByteArray();
QByteArray to = QByteArray();
for(int i=0; i<bWbH;i++)
{
// ARGB -> ABGR
to.append( ba[i4+3]);
to.append( ba[i4+2]);
to.append( ba[i4+1]);
to.append( ba[i4]);
}
QImage image((const unsigned char)to.data(),bW,bH,QImage::Format_RGB32);
//image.invertPixels();
image.save(fileName,"PNG");

thanks for help!

Thanks for the tip, I'll try it :).

I finally found a method to solve the problem. The following is the code snippet.

main.cpp

#include <QGuiApplication> #include <QStringList> #include <qqmlengine.h> #include <qqmlcontext.h> #include <qqml.h> #include <QtQuick/qquickitem.h> #include <QtQuick/qquickview.h> #include <jsondata.h> int main(int argc, char ** argv) { QGuiApplication app(argc, argv); QStringList datalist; Jsondata jsondata; jsondata.datalistmethod(); datalist = jsondata.datalist; QQuickView view; QQmlContext *ctxt = view.rootContext(); ctxt->setContextProperty("myModel", QVariant::fromValue(datalist)); view.setSource(QUrl("qrc:main.qml")); view.show(); return app.exec(); }

jsondata.h

#ifndef JSONDATA_H #define JSONDATA_H #include <QObject> #include <QNetworkReply> #include <QStringList> #include <QNetworkAccessManager> class Jsondata : public QObject { Q_OBJECT public: QStringList datalist; explicit Jsondata(QObject *parent =0); void datalistmethod(); public slots: void onResult (QNetworkReply*); private: QNetworkAccessManager *manager; };

jsondata.cpp

#include "jsondata.h" #include <QNetworkReply> #include <QNetworkRequest> #include <QNetworkAccessManager> #include <QJsonDocument> #include <QJsonObject> #include <QJsonArray> #include <QEventLoop> #include <QtQuick/qquickitem.h> #include <QtQuick/qquickview.h> #include <QTimer> #include <qqmlengine.h> #include <qqmlcontext.h> #include <qqml.h> Jsondata::Jsondata(QObject *parent) : QObject(parent) { } void Jsondata::datalistmethod() { // Now parse this JSON according to your needs ! manager = new QNetworkAccessManager(this); manager->setNetworkAccessible(QNetworkAccessManager::Accessible); QNetworkRequest request; QEventLoop eventloop; QUrl url("http://***/api/web/v1/links"); request.setUrl(url); QNetworkReply *reply = manager->get(request); connect(reply, SIGNAL(finished()), &eventloop, SLOT(quit())); eventloop.exec(); onResult(reply); } void Jsondata::onResult(QNetworkReply* reply) { QString data = (QString) reply->readAll(); qDebug() << "Response:" << data; QJsonDocument jsonResponse = QJsonDocument::fromJson(data.toUtf8()); QJsonArray jsonArray = jsonResponse.array(); foreach (const QJsonValue & value, jsonArray) { QJsonObject obj = value.toObject(); datalist.append(obj["name"].toString()); datalist.append(obj["link"].toString()); } }

By adding event loop, the datalist method will wait for the onResult method completed to execute next line of code. This is using the example of string list model. If anyone feel it useful for reference, please +1 my post. Thank you. ^^

Hi @LuisAbreu!

I cannot confirm this. Are you sure your json file is valid? The following works for me:

============================================
Json file:

{ "className": "ShoppingCart", "closedOn": "Fri Mar 27 15:52:13 2015", "coupon_count": "0", "createdOn": "Fri Mar 27 15:51:09 2015", "list": [ { "_className": "Product", "discount": "0", "fromyoubeep": "1", "has_alarm": 0, "id": "5601151333457", "intendedQuantity": 0, "isReady": "1", "isUnknown": "0", "loyaltyCredit": -1, "min_age": 0, "name": "Sumo Compal Cl<C3><A1>ssico Tutti-Fruti 1lt", "userCreated": "0", "weight": "0" }, { "_className": "Product", "fromyoubeep": "0", "has_alarm": 0, "id": "", "intendedQuantity": 0, "isReady": "1", "isUnknown": "0", "userCreated": "0", "weight": "0" } ], "loyaltyCard": { "_className": "LoyaltyCard", "barcode": "2446037038353", "barcodeType": "EAN13", "discount": "0", "fromyoubeep": "1", "has_alarm": 0, "id": "2446037038353", "intendedQuantity": 0, "isReady": "1", "isUnknown": "0", "loyaltyCredit": 0, "min_age": 0, "name": "Cart<C3><A3>o Poupa Mais", "price": "0", "product_id": "-1", "quantity": "0", "quantityValidated": "0", "state": "0", "type": 1, "userCreated": "0", "weight": "0" }, "mobile_checkout": "1" }

============================================
C++ code:

QFile file("/home/pw/file.json"); if (!file.open(QIODevice::ReadOnly)) { qDebug() << "file error"; return; } const QByteArray ba = file.readAll(); file.close(); QJsonParseError err; QJsonDocument doc = QJsonDocument::fromJson(ba, &err); qDebug() << err.errorString(); qDebug() << err.offset; QJsonObject sett2 = doc.object(); qDebug() << sett2.isEmpty(); QJsonObject sett3 = sett2.value(QString("loyaltyCard")).toObject(); qDebug() << sett3.isEmpty(); QJsonValue sett4 = sett3.value(QString("barcode")); qDebug() << sett4.toString();

============================================
Cheers!

@bundickt said:

@JKSH

The output of qDebug() << data; is:

QVariant(QJSValue, )

The output of data.value<QJSValue>().toVariant() is:

QVariant(QVariantMap, QMap((key1, QVariant(QString, value1) ) ( key2 , QVariant(QString, value2) ) ) )

Ah, right. I thought the QML engine would automatically convert the QJSValue to a QVariantMap, but you had to do the conversion yourself.

Thank you for sharing your findings!

Hi,

@metaDom said:

QJsonDocument jsonResponse = QJsonDocument::fromJson(ba); QJsonObject jsonObj = jsonResponse.object(); id = jsonObj["id"].toString();

This works fine to get upper level values, but not the sub ones. Any ideas? Thanks in advance!

You get the sub ones in the same way. "cat" is an object, so you convert the value to an object:

QJsonObject catObj = jsonObj["cat"].toObject();

"cat" is an object that contains "test", which is an array that contains 1 object that contains your 5 string elements.

This page might be useful: http://doc.qt.io/qt-5/qjsonvalue.html

Hi,

usually in TCP is a best practice to do one of the following:

Send a header with some sync info (special values, length, ...) Using New-line for text information

Are you sure there's no special character between JSON objects?
Keep in mind that

QJsonDocument doc(QJsonDocument::fromJson(json_data)); json_data.remove(0, doc.toJson().length());

could not work because QJsonDocument, make some formatting on the string so doc.toJSon().length() could return a value that is not the same you read.