How to use a QQuickView class in Qt 5.12.3?

[sinsisao]

Hi, I tried an example code and got some error occured.

Please, Help me.
Here is my code.

#include <QGuiApplication>
#include <QQuickView>
#include <QUrl>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QQuickView *pView = new QQuickView();
    pView->setSource(QUrl::fromLocalFile("main.qml"));
    pView->show();
    return app.exec();
}

with this code, I got two error.

One: "incomplete type 'QUrl' named in nested name specifier."

    pView->setSource(QUrl::fromLocalFile("main.qml"));

Two: "no member named 'show' in QQuickView."

    pView->show();

For problem number one, I tried to find what namespace has the QUrl class.
I found two define 'QT_BEGIN_NAMESPACE' and 'QT_END_NAMESPACE', I've never seen before.
I have no idea how to use it, but also no mention about it in examples.

I am using Qt 5.12.3 that seems the reason of problem number two and I couldn't tell how to use it in this Qt version.
How can I use the QQuickView class?
Where can I look for some advises or references for that?

[J.Hilk]

@sinsisao hi and welcome

did you add ‚QT += quick to your pro file?

and did you rerun qmake afterwards?

[sinsisao]

@J.Hilk Yes, I did add QT += quick in my .pro file and I rerun qmake of course.

[J.Hilk]

@sinsisao
I just run your code, except a warning that main.qml could not be found ( as I don't have one)

main.qml: No such file or directory

It's working fine. Everything is detected and the program executes and shows the(empty) quickview just fine.

Qt 5.12.2 & 5.12.3 on MacOS