qt-everywhere-src-5.15.1/qtmultimedia/examples/multimedia/declarative-camera/qmlcamera.cpp

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#include <QGuiApplication>
#include <QQuickView>
#include <QQmlEngine>

int main(int argc, char* argv[])
{
    QGuiApplication app(argc,argv);
    QQuickView view;
    view.setResizeMode(QQuickView::SizeRootObjectToView);
    // Qt.quit() called in embedded .qml by default only emits
    // quit() signal, so do this (optionally use Qt.exit()).
    QObject::connect(view.engine(), &QQmlEngine::quit,
                     qApp, &QGuiApplication::quit);
    view.setSource(QUrl("qrc:///declarative-camera.qml"));
    view.resize(800, 480);
    view.show();
    return app.exec();
}