Importing QtQuick.XmlListModel causes simple QML/C++ app to crash

[deleted561]

I am using Qt 5.15.1 on Windows 7 with MSVC2019 (64-bit) configuration. The results are the same for the 32-bit configuration.

The source files for a simple app which replicates the problem are below. The steps to replicate are:

1. Compile the application in release 64-bit.
2. Copy XmlListTest.exe file to an empty directory.
3. Open a cmd prompt, cd to the directory with XmlListTest.exe and run:
   windeployqt --release --qmldir C:\Qt\5.15.1\msvc2019_64\qml .\XmlListTest.exe
4. Run XmlListTest.exe.

When I run XmlListTest.exe, either I get an error message (application was unable to start correctly) or there is no message and no window. In this second case, I have to stop the process using Task Manager.

If I remove line 4 (import QtQuick.XmlListModel 2.0) from window.qml and follow the steps above, the app runs as expected, displaying a small window.

The crash or no-window only happens when I run XmlListTest.exe outside of Qt Creator. When I run the app from inside Qt Creator, it executes as expected, displaying a small window.

I suspect that it might be a problem with windeployqt, but have no way of confirming this. I've tried running windeployqt with the --xml and --xmlpatterns options, but it did not change the results.

Does anyone know what the problem might be?

Thanks.

The XmlListTest.pro file is:

 1:  TEMPLATE = app
 2:  QT += qml quick xmlpatterns
 3:  CONFIG += c++11
 4:  SOURCES += main.cpp
 5:  RESOURCES += window.qml

The main.cpp file is:

 1:  #include <QGuiApplication>
 2:  #include <QQmlApplicationEngine>
 3:  
 4:  int main(int argc, char *argv[]) {
 5:      QGuiApplication app(argc, argv);
 6:      QQmlApplicationEngine engine;
 7:      engine.load(QUrl(QStringLiteral("qrc:/window.qml")));
 8:      return app.exec();
 9:  }

The window.qml file is:

 1:  import QtQuick 2.5
 2:  import QtQuick.Window 2.2
 3:  import QtQuick.Controls 1.4
 4:  import QtQuick.XmlListModel 2.0
 5:  
 6:  ApplicationWindow {
 7:      visible: true
 8:      width: 200
 9:      height: 100
10:      title: qsTr("QML XML List Test")
11:  }

[J.Hilk]

hi @GrahamWilsonRMP said in Importing QtQuick.XmlListModel causes simple QML/C++ app to crash:

Does anyone know what the problem might be?

this:
--qmldir C:\Qt\5.15.1\msvc2019_64\qml
is the wrong qmldir. You passed the deployment tool the directory of your Qt installation.

You have to give it the path to the directory of your QML files ( main.qml etc) the tool will than parse those files and fetch everything needed from the qt installation(the one that provided the windeployqt.exe)

[deleted561]

@J-Hilk Greetings and thank you! You fixed my problem.

Odd ... I've been using windeployqt incorrectly, and only now did it bite me :-)