[SOLVED] QML Application Crashes on window->show

rizoritis

Hello,

I made a very basic application where I am just creating a rectangle in QML and showing it from my main as follows:

main.cpp
@#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQuickWindow>

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

QQmlApplicationEngine engine;
engine.load(QStringLiteral("C:/Qt/Tools/QtCreator/bin/FreakingWork/main.qml"));

QObject *topLevel = engine.rootObjects().value(0);
QQuickWindow *window = qobject_cast<QQuickWindow *>(topLevel);
window->show();

return app.exec&#40;&#41;;

}@

main.qml
@import QtQuick 2.0

Rectangle {
width: 100
height: 62
}@

For some reason when I run the above it says that "The program unexpectedly finished" and that the .exe has crashed. It seems that what I am doing is very basic so I do not see what can cause it to crash.

If I comment out the window->show portion it does not crash until I tell the program to stop running. Any ideas?

SGaist

Hi,

Two possibilities:

topLevel is NULL

topLevel is not a QQuickWindow thus window is NULL

rizoritis

[quote author="SGaist" date="1393534511"]Hi,

Two possibilities:

topLevel is NULL

topLevel is not a QQuickWindow thus window is NULL[/quote]

Thanks for the quick response. In the back of my mind I knew that was the problem. I guess the better question is why is that happening. I have used this same code numerous times without error, but for some reason now I am having a problem. I checked my path to main.qml and it is fine. I am not sure how else to debug it.

rizoritis

I solved the problem. It was that in my main.qml, my top level component was a rectangle. I changed it to ApplicationWindow so that I actually had a window and it worked. I had to add import QtQuick.Controls 1.0 as well.

Thanks for the help SGaist!