Qt Network Access Manager JSON Get Response - c++

Question

I'm trying to pull JSON data from a URL using the Qt framework, and I've run into some issues with getting a return from the get request. I've seen multiple questions asked regarding my issue, but none of the given solutions has solved my problem.
So I have a button that, once clicked, should execute the get request. Here's my code.
//When button is pressed
void Test1::onClickCapture()
{
qDebug() << "Capture Clicked!!";
toPopulate();
}
//Code to execute the connection
void Test1::toPopulate() {
qDebug() << "Populating!";
QNetworkAccessManager* manager = new QNetworkAccessManager(this);
QNetworkRequest request;
QUrl url("https://jsonplaceholder.typicode.com/posts/1");
request.setUrl(url);
QNetworkReply *reply = manager->get(request);
connect(reply, &QNetworkReply::readyRead, this, &Test1::onResult);
}
//And finally, my onResult slot
void Test1::onResult() {
reply->deleteLater();
if (reply->error() != QNetworkReply::NoError) {
return;
}
qDebug() << "Response!";
}
Every time I debug the code, it never gets to my onResult slot.
I also get this error, which may be relevant.
QObject::connect: Cannot connect (null)::aboutToQuit() to QNativeWifiEngine::closeHandle()

Answer 1

I have modified your code. It's working fine for me:
//Code to execute the connection
void MainWindow::toPopulate() {
qDebug() << "Populating!";
QNetworkAccessManager* manager = new QNetworkAccessManager(this);
QNetworkRequest request;
QUrl url("https://jsonplaceholder.typicode.com/posts/1");
request.setUrl(url);
QNetworkReply *reply = manager->get(request);
connect(reply, SIGNAL(downloadProgress(qint64,qint64)), this, SLOT(downloading(qint64,qint64)));
connect(reply, SIGNAL(finished()), this, SLOT(onResult()));
}
void MainWindow::downloading(qint64 bytesReceived, qint64 bytesTotal) {
qDebug() << "Downloading " << bytesReceived/bytesTotal*100 << " %.";
}
//And finally, my onResult slot
void MainWindow::onResult() {
QNetworkReply* reply = qobject_cast<QNetworkReply*> (QObject::sender());
if (reply->error() != QNetworkReply::NoError) {
qDebug() << "Error downloading. " << reply->errorString();
return;
}
reply->deleteLater();
qDebug() << "Response! " << reply->readAll();
}
Result:
Populating!
Downloading -29200 %.
Downloading 100 %.
Response! "{\n \"userId\": 1,\n \"id\": 1,\n \"title\": \"sunt aut facere repellat provident occaecati excepturi optio reprehenderit\",\n \"body\": \"quia et suscipit\\nsuscipit recusandae consequuntur expedita et cum\\nreprehenderit molestiae ut ut quas totam\\nnostrum rerum est autem sunt rem eveniet architecto\"\n}"