Question about Qhttpserver and QtFuture

apaczenko1993

Hello, I have writted code like this:

server->route("/promise", [this] (const QHttpServerRequest & request){

         writeLog(request.remoteAddress().toString() + ":" + QString::number(request.remotePort()) + " <--- Otrzymano request '/promise'");

         auto * watcher = new QFutureWatcher<QHttpServerResponse>(this);

         connect(watcher, &QFutureWatcher<QHttpServerResponse>::finished, this, [watcher, this, &request]() {
                writeLog(request.remoteAddress().toString() + ":" + QString::number(request.remotePort()) + " ---> Request '/promise' zakonczony, zwracam odpowiedź");
                watcher->deleteLater();
         });

         QFuture<QHttpServerResponse> future = QtConcurrent::run([&] () {
                qDebug() << "Long task";
                QThread::msleep(1500);
                qDebug() << "Generating JSON"
                QJsonDocument jsonDoc2(QJsonObject{
                                           {
                                               {"key1", "1"},
                                               {"key2", "2"},
                                               {"key3", "3"}
                                           }
                                       });
                QByteArray jsonData = jsonDoc2.toJson(QJsonDocument::Compact);

                QHttpServerResponse response(jsonData, QHttpServerResponse::StatusCode::Ok);
                response.setHeader("Access-Control-Allow-Origin", "*");
                response.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
                response.setHeader("Access-Control-Allow-Headers", "Origin, Content-Type, Accept");
                response.setHeader("Content-Type", "application/json");
                return response;
            });

         watcher->setFuture(future);
         return future;
     });

and as I understand this route will be in a separate thread, but how can I receive a log information from QtConcurrent::run functon to main thread to show log info in GUI like qDebug() << "Generating JSON"?

SGaist

Hi,

I am not sure to follow you, do you mean you want to get all qDebug messages in a widget ?
That can be done using qInstallMessageHandler.

apaczenko1993

Hi, I want to show all log messages in a QPlainTextEdit and save it to log file

SGaist

This article shows a way to do it.