[SOLVED] Qt5, QtQuick 2, HelloWorld application, issue with QQuickView

billouparis

Hello,
I am trying to compile and run a very simple HelloWorld application using Qt5 and QML (QtQuick 2).
i added the following in the .pro file:
@QT += quick@

My main.cpp file looks like:
@#include <QCoreApplication>
#include <QtQuick/QQuickView>

Q_DECL_EXPORT int main(int argc, char *argv[])
{
QCoreApplication app(argc, argv, 5);

QQuickView *  viewer = new QQuickView;
//viewer.setOrientation(QQuickView::ScreenOrientationAuto);
viewer->setSource(QUrl("qml/helloWorldQT5/main.qml"));
viewer->show();

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

}
@

My main.qml file looks like:
@import QtQuick 2.0

Rectangle {
width: 360
height: 360
Text {
text: qsTr("Hello World")
anchors.centerIn: parent
}
MouseArea {
anchors.fill: parent
onClicked: {
Qt.quit();
}
}
}@

The compilation and link of this source code is alright.
But there is a runtime error occuring while performing the following:
@QQuickView * viewer = new QQuickView;@

if I run it in debug mode, I've got a NULL pointer in the following function inside qguiapplication.cpp:
@QFont QGuiApplication::font()
{
QMutexLocker locker(applicationFontMutex());
if (!QGuiApplicationPrivate::app_font)
QGuiApplicationPrivate::app_font =
new QFont(QGuiApplicationPrivate::platformIntegration()->fontDatabase()->defaultFont());
return *QGuiApplicationPrivate::app_font;
}@

The QGuiApplicationPrivate::platformIntegration() value is apparently NULL.
Has anyone any hint to help me there?

I built the qt5 using the following command line:
@./configure -confirm-license -opensource -no-multimedia -no-phonon -debug -declarative -v8 -opengl -nomake examples -nomake tests -prefix ~/qt5bin -developer-build@

(there might be an error using both prefix and -developer-build in the same time I think :) )

billouparis

Also the Application Output looks like this:
@Debugging starts
&"warning: GDB: Failed to set controlling terminal: Invalid argument\n"
.dynamic section for "/lib/libpthread.so.0" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/lib/libm.so.6" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/usr/lib/libpng12.so.0" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/lib/libdl.so.2" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/lib/libgthread-2.0.so.0" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/lib/librt.so.1" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/usr/lib/libXdamage.so.1" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/usr/lib/libdrm.so.2" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
.dynamic section for "/usr/lib/libXau.so.6" is not at the expected address
difference appears to be caused by prelink, adjusting expectations
Qml debugging is enabled. Only use this in a safe environment!
can't find linker symbol for virtual table for QQuickView' value found QDeclarativeJS::IR::BasicBlock::JUMP(QDeclarativeJS::IR::BasicBlock*)' instead@

cgmelt

try adding declarative to QT in .pro file i.e:

@QT += quick declarative@

billouparis

I added your suggestion, the crash / segmentation fault is still occuring :(

The stack looks like this when the segmentation fault occurs:
@0 QGuiApplication::font qguiapplication.cpp 1333 0x6dd26f1
1 QFont::QFont qfont.cpp 685 0x6e58ec1
2 QDeclarativeFontValueType::QDeclarativeFontValueType qdeclarativevaluetype.cpp 221 0xa32ce8
3 QDeclarativeValueTypeFactory::valueType qdeclarativevaluetype.cpp 159 0xa312f6
4 QDeclarativeValueTypeFactory::QDeclarativeValueTypeFactory qdeclarativevaluetype.cpp 84 0xa30e22
5 QDeclarativeEnginePrivate::QDeclarativeEnginePrivate qdeclarativeengine.cpp 347 0x9a49f0
6 QDeclarativeEngine::QDeclarativeEngine qdeclarativeengine.cpp 504 0x9a56ff
7 QQuickViewPrivate::QQuickViewPrivate qquickview.cpp 70 0x383875
8 QQuickView::QQuickView qquickview.cpp 159 0x383d48
9 main main.cpp 8 0x8048a3e
@

billouparis

It is now working with a simple declaration change:
QCoreApplication -> QGuiApplication
ah!

@
#include <QtQuick/QQuickView>
#include <QGuiApplication>

Q_DECL_EXPORT int main(int argc, char *argv[])
{

QGuiApplication app(argc, argv, 5);

QQuickView viewer;
//viewer.setOrientation(QQuickView::ScreenOrientationAuto);
viewer.setSource(QUrl("qml/helloWorldQT5/main.qml"));
viewer.show();

return app.exec();

}
@

andreagrandi

It worked for me too.

My problem was also the fact that I had to create a .pro manually because using the one generated by QtCreator was not working (I got this error: qmlapplicationviewer/qmlapplicationviewer.cpp:15:30: fatal error: QtGui/QApplication: No such file or directory)

so I just used:

@SOURCES +=
main.cpp

OTHER_FILES +=
qml/Test/main.qml

QT += quick

install_it.path = $${M_BUILDDIR}

for(FILE, OTHER_FILES){
install_it.files += $${FILE}
}

INSTALLS += install_it@

moravas

Hi,

I am tried to build a very simple QtQuick 2.0 project with Qt 5.0.0 and Qt Creator 2.6.1. I made a new project, selected the "Qt Quick 2 Application (Built-in Elements)", set the name and press "next -> next ... etc".

If I run the application, I get a simple window with white background and the "Hello World" text.

If I open the main.qml file, I found in the editor the following message in a label:
"Unsupported QtQuick version(0:0)
Go to error"

I click on the "Go to error", I see the following line in the text editor:
@
import QtQuick 2.0
@

It is a first line in main.qml file.

Can somebody help me to can use the QTQuick 2.0 too?

Regards,
Norbert

wild34

Current version of a built-in designer in QtCreator doesn`t support QtQuick 2.
You need to use Text Editor for your main.qml and to study writting UI in QMLanguage.