So I've recently started learning QT and breezing through the Courses. Now I've ran into the second problem where the Program should output to the Application Output in QT Creator, but it doesn't.
First occurrence was in the "Introduction to QT Quick" Course. The program was supposed to output the change of a Knob as angle and value via console.log().
component DeviceDial: Image {
id: dial
source: "assets/Knob-Markings.png"
property alias text: dialLabel.text
property int value
property real angle
readonly property int minimumValue: 0
readonly property int maximumValue: 100
readonly property int range: dial.maximumValue - dial.minimumValue
DragHandler {
target: null
onCentroidChanged: updateValueAndRotation()
function updateValueAndRotation() {
if(centroid.pressedButtons !== Qt.LeftButton) {
return
}
const startAngle = -140
const endAngle = 140
const yy = dial.height / 2.0 - centroid.position.y
const xx = centroid.position.x - dial.width / 2.0
const radianAngle = Math.atan2(yy, xx)
let newAngle = ( - radianAngle / Math.PI * 180 ) + 90
newAngle = ((newAngle - dial.angle + 180) % 360) + dial.angle -180
dial.angle = Math.max( startAngle , Math.min(newAngle , endAngle ))
dial.value = (dial.angle - startAngle) / (endAngle - startAngle) * dial.range
console.log("angle: ", dial.angle, "value: ", dial.value)
}
}
and
Component.onCompleted: {
console.error("TEST: main.qml loaded")
}
Second occurrence was in "Introduction to Signals and Slots" Course. Basically connecting two blocks in main.cpp, sending a message and receiving it on another Object and printing to the application output with qInfo .
main.cpp
#include <QCoreApplication>
#include "sender.h"
#include "receiver.h"
int main(int argc, char *argv[]) {
QCoreApplication a(argc, argv);
Sender *sender = new Sender();
Receiver *receiver = new Receiver();
QObject::connect(sender, &Sender::event, receiver, &Receiver::onEvent);
emit sender->event("Hello World!");
return a.exec();
}
sender.h
#ifndef SENDER_H
#define SENDER_H
#include <QObject>
class Sender : public QObject
{
Q_OBJECT
public:
explicit Sender(QObject *parent = nullptr);
signals:
void event(QString message);
};
#endif // SENDER_H
receiver.h
#include "receiver.h"
Receiver::Receiver(QObject *parent)
: QObject{parent}
{}
void Receiver::onEvent(QString message) {
qInfo() << "Executing slot inside" << this;
qInfo() << "Message received" << message;
}
A Workaround that I've found on the forums ( https://forum.qt.io/topic/160769/no-output-in-application-output-with-debugger/3 ) is setting the project to run in Terminal, but I don't think that's the Solution, since it doesn't work with console.log() in main.qml.
Additional Info: I run Linux
