Qml contents doesn't appear under Windows

[just_a_developer]

Hello,

QML contents doesn't appear under Windows for a fresh project, that was generated by QtCreator.

Here is what I did :

• l have generated a project using QtCreator => New project... => Application (Qt Quick) => Qt Quick Application - Scroll => using CMake as the build system
• Using QtCreator I have built the app in Release build configuration.
• I have moved the built *.exe to a freshly created, empty folder.
• I called
  C:/Qt/5.12.2/msvc2017_64/bin/windeployqt.exe QtCreatorScrollProject.exe --release --qmldir=c:\Users\<myUserName>\Documents\QtCreatorScrollProject
  to deploy the Qt dependencies next to the project.

When I run this build on my development machine, it works fine :

When I try to run the exact same app on a fresh virtual machine, the window appears, but the QML contents inside of the window are not visible ( == the scrollable list doesn't appear ) :

I guessed that it is a deployment issue, so I tried to follow this guide : https://wiki.qt.io/Deploy_an_Application_on_Windows . I followed these steps :
"
Copy the following into C:\Deployment
The release version of MyApp.exe
All the .dll files from C:\Qt\5.2.1\mingw48_32\bin
All the folders from C:\Qt\5.2.1\mingw48_32\plugins
(If you used QML) All the folders from C:\Qt\5.2.1\mingw48_32\qml
"
which I actually had to translate to these steps for myself :
"
Copy the following into C:\Deployment
The release version of QtCreatorScrollProject.exe
All the .dll files from C:\Qt\5.12.2\msvc2017_64\bin
All the folders from C:\Qt\5.12.2\msvc2017_64\plugins
(If you used QML) All the folders from C:\Qt\5.12.2\msvc2017_64\qml
"
But even after having done this, the app doesn't show the QML contents.

What could I do to fix this issue?

Thank you for your help in advance!

[just_a_developer]

OK : I got the fix : it is a rendering issue.

When I force rendering via ANGLE, it works : Options for forcing rendering via ANGLE :
1.: setting the QT_OPENGL environment variable to angle . (I only tested this solution, and it works well.)
2.: compile Qt with configure ... -angle .
3.: call QCoreApplication::setAttribute(Qt::AA_UseOpenGLES); before creating the QApplication object .

There is still an interesting thing : based on Qt's documentation, Qt libraries are compiled with -opengl dynamic which means that Qt should fallback to using the ANGLE renderer by itself (without me having to forcefully ask it to do that).
Ref.: https://doc.qt.io/qt-5/windows-requirements.html#graphics-drivers
Ref2.: https://doc.qt.io/qt-5/configure-options.html#opengl-options-for-windows

So it seems like that this fallback mechanism is broken.

( A bit more info about the different renderers : https://wiki.qt.io/Qt_5_on_Windows_ANGLE_and_OpenGL )

[J.Hilk]

@just_a_developer do you have your qml files inside your qrc resources ? Or do you load them from the filesystem

[just_a_developer]

@J-Hilk :
QtCreator generates a project which has QML in qrc resources :

[J.Hilk]

@just_a_developer ok

your argument for windeployqt seems to be wrong

you have
--qmldir=c:\Users<myUserName>\Documents\QtCreatorScrollProject

and it probably should be
--qmldir c:\Users<myUserName>\Documents\QtCreatorScrollProject

[just_a_developer]

@J-Hilk
I just tried with :
--qmldir c:\Users<myUserName>\Documents\QtCreatorScrollProject

, and I got the same results : QML contents still don't appear.

Just for the reference : here is the full project :
https://github.com/szigetics/QtCreatorScrollProject
( This is actually exactly what QtCreator gives you when you create a new project. )

[KH-219Design]

I wonder if this is a case of needing "the common hack" of passing all of the Qt framework qml as the qmldir.

My build script (yes, I run bash on windows) does it like so:

windeployqt "${FLAVOR}" --qmldir "${WINALLQML}"  app.exe

Where WINALLQML is something like C:/my_third_party_sources/Qt_desktop/5.15.0/msvc2019_64/qml

[KH-219Design]

You'll really want to see what the STDOUT/STDERR (console output) is printing when you launch the exe.

There should definitely be a warning or an error printed that would clarify what exactly is going wrong.

I don't often work on windows, so my knowledge of how exactly to see all the output is "spotty", but if you aren't seeing any output then I think you need to add CONFIG+=CONSOLE, as in...

qmake.exe CONFIG+=CONSOLE path/to/project

[just_a_developer]

@KH-219Design
Thank you for your reply.

I have added

--qmldir "${WINALLQML}" 

to the windeployqt call, so the whole call looks like this :

 C:/Qt/5.12.2/msvc2017_64/bin/windeployqt.exe QtCreatorScrollProject.exe --release --qmldir c:\\Users\\<myUserName>\\Documents\\QtCreatorScrollProject --qmldir c:\\Qt\\5.12.2\\msvc2017_64\\qml

but I still got the same result (empty window - QML contents doesn't appear).

[KroMignon]

@just_a_developer said in Qml contents doesn't appear under Windows:

to the windeployqt call, so the whole call looks like this :
C:/Qt/5.12.2/msvc2017_64/bin/windeployqt.exe QtCreatorScrollProject.exe --release --qmldir c:\Users\<myUserName>\Documents\QtCreatorScrollProject --qmldir c:\Qt\5.12.2\msvc2017_64\qml

but I still got the same result (empty window - QML contents doesn't appear).

Why do you have 2 time --qmldir in your command line?

[just_a_developer]

@KroMignon said in Qml contents doesn't appear under Windows:

Why do you have 2 time --qmldir in your command line?

Originally I only had one --qmldir . I added the additional one as per @KH-219Design 's suggestion.
windeployqt supports passing multiple --qmldir s : here is the (beggining of the) output of the C:/Qt/5.12.2/msvc2017_64/bin/windeployqt.exe QtCreatorScrollProject.exe --release --qmldir c:\\Users\\<myUserName>\\Documents\\QtCreatorScrollProject --qmldir c:\\Qt\\5.12.2\\msvc2017_64\\qml call :

C:\Users\<myUserName>\Desktop\5\QtCreatorScrollProject.exe 64 bit, release executable [QML]
Scanning c:\Users\<myUserName>\Documents\QtCreatorScrollProject:
QML imports:
  'QtQuick' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick.2
  'QtQuick.Controls' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2
  'QtQuick.Templates' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Templates.2
  'QtQuick.Window' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Window.2
  'QtQuick.Controls.Fusion' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Fusion
  'QtQuick.Controls.Imagine' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Imagine
  'QtGraphicalEffects' C:\Qt\5.12.2\msvc2017_64\qml\QtGraphicalEffects
  'QtGraphicalEffects/private' C:\Qt\5.12.2\msvc2017_64\qml\QtGraphicalEffects\private
  'QtQuick.Controls.Material' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Material
  'QtQuick.Controls.Universal' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Universal
Scanning c:\Qt\5.12.2\msvc2017_64\qml:
QML imports:
  'QtQuick' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick.2
  'QtQuick.Controls' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2
  'QtQuick.Templates' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Templates.2
  'QtQuick.Window' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Window.2
  'QtQuick.Controls.Fusion' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Fusion
  'QtQuick.Controls.Imagine' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Imagine
  'QtGraphicalEffects' C:\Qt\5.12.2\msvc2017_64\qml\QtGraphicalEffects
  'QtGraphicalEffects/private' C:\Qt\5.12.2\msvc2017_64\qml\QtGraphicalEffects\private
  'QtQuick.Controls.Material' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Material
  'QtQuick.Controls.Universal' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls.2\Universal
  'Qt.labs.calendar' C:\Qt\5.12.2\msvc2017_64\qml\Qt\labs\calendar
  'QtMultimedia' C:\Qt\5.12.2\msvc2017_64\qml\QtMultimedia
  'QtQuick.Controls' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls
  'QtQuick.Layouts' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Layouts
  'QtQuick.Controls.Private' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls\Private
  'QtQuick.Controls.Styles' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Controls\Styles
  'QtQml.Models' C:\Qt\5.12.2\msvc2017_64\qml\QtQml\Models.2
  'QtQuick.Extras.Private' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Extras\Private
  'QtQuick.Extras' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Extras
  'QtQuick.Dialogs' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Dialogs
  'Qt.labs.folderlistmodel' C:\Qt\5.12.2\msvc2017_64\qml\Qt\labs\folderlistmodel
  'Qt.labs.settings' C:\Qt\5.12.2\msvc2017_64\qml\Qt\labs\settings
  'QtQuick.Dialogs.Private' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\Dialogs\Private
  'QtQuick.PrivateWidgets' C:\Qt\5.12.2\msvc2017_64\qml\QtQuick\PrivateWidgets
  'QtTest' C:\Qt\5.12.2\msvc2017_64\qml\QtTest
  'QtWinExtras' C:\Qt\5.12.2\msvc2017_64\qml\QtWinExtras

[J.Hilk]

@just_a_developer

Usage: windeployqt [options] [files]

options before the file!

[just_a_developer]

@J-Hilk said in Qml contents doesn't appear under Windows:

@just_a_developer

Usage: windeployqt [options] [files]

options before the file!

I tried :

 C:/Qt/5.12.2/msvc2017_64/bin/windeployqt.exe --release --qmldir c:\\Users\\\<myUserName>\\Documents\\QtCreatorScrollProject QtCreatorScrollProject.exe

but I still got the same result (empty window - QML contents doesn't appear).

(Side note : the directory layout for the output is the same for windeployqt [options] [files] and windeployqt [files] [options] )

[J.Hilk]

@just_a_developer said in Qml contents doesn't appear under Windows:

the directory layout for the output is the same

can you share a screenshot from that?

[just_a_developer]

@J-Hilk said in Qml contents doesn't appear under Windows:

@just_a_developer said in Qml contents doesn't appear under Windows:

the directory layout for the output is the same

can you share a screenshot from that?

Sure. Here it is :

tree /f                                                                                                                                                                                                                                                                             Folder PATH listing for volume <masked>
Volume serial number is <masked>
C:.
│   D3Dcompiler_47.dll
│   libEGL.dll
│   libGLESV2.dll
│   opengl32sw.dll
│   Qt5Core.dll
│   Qt5Gui.dll
│   Qt5Network.dll
│   Qt5Qml.dll
│   Qt5Quick.dll
│   Qt5QuickControls2.dll
│   Qt5QuickTemplates2.dll
│   Qt5Svg.dll
│   Qt5Widgets.dll
│   QtCreatorScrollProject.exe
│
├───bearer
│       qgenericbearer.dll
│
├───iconengines
│       qsvgicon.dll
│
├───imageformats
│       qgif.dll
│       qicns.dll
│       qico.dll
│       qjpeg.dll
│       qsvg.dll
│       qtga.dll
│       qtiff.dll
│       qwbmp.dll
│       qwebp.dll
│
├───platforminputcontexts
│       qtvirtualkeyboardplugin.dll
│
├───platforms
│       qwindows.dll
│
├───qmltooling
│       qmldbg_debugger.dll
│       qmldbg_inspector.dll
│       qmldbg_local.dll
│       qmldbg_messages.dll
│       qmldbg_native.dll
│       qmldbg_nativedebugger.dll
│       qmldbg_preview.dll
│       qmldbg_profiler.dll
│       qmldbg_quickprofiler.dll
│       qmldbg_server.dll
│       qmldbg_tcp.dll
│
├───QtGraphicalEffects
│   │   Blend.qml
│   │   BrightnessContrast.qml
│   │   Colorize.qml
│   │   ColorOverlay.qml
│   │   ConicalGradient.qml
│   │   Desaturate.qml
│   │   DirectionalBlur.qml
│   │   Displace.qml
│   │   DropShadow.qml
│   │   FastBlur.qml
│   │   GammaAdjust.qml
│   │   GaussianBlur.qml
│   │   Glow.qml
│   │   HueSaturation.qml
│   │   InnerShadow.qml
│   │   LevelAdjust.qml
│   │   LinearGradient.qml
│   │   MaskedBlur.qml
│   │   OpacityMask.qml
│   │   plugins.qmltypes
│   │   qmldir
│   │   qtgraphicaleffectsplugin.dll
│   │   RadialBlur.qml
│   │   RadialGradient.qml
│   │   RectangularGlow.qml
│   │   RecursiveBlur.qml
│   │   ThresholdMask.qml
│   │   ZoomBlur.qml
│   │
│   └───private
│           DropShadowBase.qml
│           DropShadowBase.qmlc
│           FastGlow.qml
│           FastGlow.qmlc
│           FastInnerShadow.qml
│           FastInnerShadow.qmlc
│           FastMaskedBlur.qml
│           FastMaskedBlur.qmlc
│           GaussianDirectionalBlur.qml
│           GaussianDirectionalBlur.qmlc
│           GaussianGlow.qml
│           GaussianGlow.qmlc
│           GaussianInnerShadow.qml
│           GaussianInnerShadow.qmlc
│           GaussianMaskedBlur.qml
│           GaussianMaskedBlur.qmlc
│           qmldir
│           qtgraphicaleffectsprivate.dll
│
├───QtQuick
│   ├───Controls.2
│   │   │   AbstractButton.qml
│   │   │   Action.qml
│   │   │   ActionGroup.qml
│   │   │   ApplicationWindow.qml
│   │   │   BusyIndicator.qml
│   │   │   Button.qml
│   │   │   ButtonGroup.qml
│   │   │   CheckBox.qml
│   │   │   CheckDelegate.qml
│   │   │   ComboBox.qml
│   │   │   Container.qml
│   │   │   Control.qml
│   │   │   DelayButton.qml
│   │   │   Dial.qml
│   │   │   Dialog.qml
│   │   │   DialogButtonBox.qml
│   │   │   Drawer.qml
│   │   │   Frame.qml
│   │   │   GroupBox.qml
│   │   │   ItemDelegate.qml
│   │   │   Label.qml
│   │   │   Menu.qml
│   │   │   MenuBar.qml
│   │   │   MenuBarItem.qml
│   │   │   MenuItem.qml
│   │   │   MenuSeparator.qml
│   │   │   Page.qml
│   │   │   PageIndicator.qml
│   │   │   Pane.qml
│   │   │   plugins.qmltypes
│   │   │   Popup.qml
│   │   │   ProgressBar.qml
│   │   │   qmldir
│   │   │   qtquickcontrols2plugin.dll
│   │   │   RadioButton.qml
│   │   │   RadioDelegate.qml
│   │   │   RangeSlider.qml
│   │   │   RoundButton.qml
│   │   │   ScrollBar.qml
│   │   │   ScrollIndicator.qml
│   │   │   ScrollView.qml
│   │   │   Slider.qml
│   │   │   SpinBox.qml
│   │   │   StackView.qml
│   │   │   SwipeDelegate.qml
│   │   │   SwipeView.qml
│   │   │   Switch.qml
│   │   │   SwitchDelegate.qml
│   │   │   TabBar.qml
│   │   │   TabButton.qml
│   │   │   TextArea.qml
│   │   │   TextField.qml
│   │   │   ToolBar.qml
│   │   │   ToolButton.qml
│   │   │   ToolSeparator.qml
│   │   │   ToolTip.qml
│   │   │   Tumbler.qml
│   │   │
│   │   ├───Fusion
│   │   │       ApplicationWindow.qml
│   │   │       BusyIndicator.qml
│   │   │       Button.qml
│   │   │       ButtonPanel.qml
│   │   │       CheckBox.qml
│   │   │       CheckDelegate.qml
│   │   │       CheckIndicator.qml
│   │   │       ComboBox.qml
│   │   │       DelayButton.qml
│   │   │       Dial.qml
│   │   │       Dialog.qml
│   │   │       DialogButtonBox.qml
│   │   │       Drawer.qml
│   │   │       Frame.qml
│   │   │       GroupBox.qml
│   │   │       ItemDelegate.qml
│   │   │       Label.qml
│   │   │       Menu.qml
│   │   │       MenuBar.qml
│   │   │       MenuBarItem.qml
│   │   │       MenuItem.qml
│   │   │       MenuSeparator.qml
│   │   │       Page.qml
│   │   │       PageIndicator.qml
│   │   │       Pane.qml
│   │   │       plugins.qmltypes
│   │   │       Popup.qml
│   │   │       ProgressBar.qml
│   │   │       qmldir
│   │   │       qtquickcontrols2fusionstyleplugin.dll
│   │   │       RadioButton.qml
│   │   │       RadioDelegate.qml
│   │   │       RadioIndicator.qml
│   │   │       RangeSlider.qml
│   │   │       RoundButton.qml
│   │   │       ScrollBar.qml
│   │   │       ScrollIndicator.qml
│   │   │       Slider.qml
│   │   │       SliderGroove.qml
│   │   │       SliderHandle.qml
│   │   │       SpinBox.qml
│   │   │       SwipeDelegate.qml
│   │   │       Switch.qml
│   │   │       SwitchDelegate.qml
│   │   │       SwitchIndicator.qml
│   │   │       TabBar.qml
│   │   │       TabButton.qml
│   │   │       TextArea.qml
│   │   │       TextField.qml
│   │   │       ToolBar.qml
│   │   │       ToolButton.qml
│   │   │       ToolSeparator.qml
│   │   │       ToolTip.qml
│   │   │       Tumbler.qml
│   │   │
│   │   ├───Imagine
│   │   │       ApplicationWindow.qml
│   │   │       BusyIndicator.qml
│   │   │       Button.qml
│   │   │       CheckBox.qml
│   │   │       CheckDelegate.qml
│   │   │       ComboBox.qml
│   │   │       DelayButton.qml
│   │   │       Dial.qml
│   │   │       Dialog.qml
│   │   │       DialogButtonBox.qml
│   │   │       Drawer.qml
│   │   │       Frame.qml
│   │   │       GroupBox.qml
│   │   │       ItemDelegate.qml
│   │   │       Label.qml
│   │   │       Menu.qml
│   │   │       MenuItem.qml
│   │   │       MenuSeparator.qml
│   │   │       Page.qml
│   │   │       PageIndicator.qml
│   │   │       Pane.qml
│   │   │       plugins.qmltypes
│   │   │       Popup.qml
│   │   │       ProgressBar.qml
│   │   │       qmldir
│   │   │       qtquickcontrols2imaginestyleplugin.dll
│   │   │       RadioButton.qml
│   │   │       RadioDelegate.qml
│   │   │       RangeSlider.qml
│   │   │       RoundButton.qml
│   │   │       ScrollBar.qml
│   │   │       ScrollIndicator.qml
│   │   │       Slider.qml
│   │   │       SpinBox.qml
│   │   │       StackView.qml
│   │   │       SwipeDelegate.qml
│   │   │       SwipeView.qml
│   │   │       Switch.qml
│   │   │       SwitchDelegate.qml
│   │   │       TabBar.qml
│   │   │       TabButton.qml
│   │   │       TextArea.qml
│   │   │       TextField.qml
│   │   │       ToolBar.qml
│   │   │       ToolButton.qml
│   │   │       ToolSeparator.qml
│   │   │       ToolTip.qml
│   │   │       Tumbler.qml
│   │   │
│   │   ├───Material
│   │   │       ApplicationWindow.qml
│   │   │       BoxShadow.qml
│   │   │       BusyIndicator.qml
│   │   │       Button.qml
│   │   │       CheckBox.qml
│   │   │       CheckDelegate.qml
│   │   │       CheckIndicator.qml
│   │   │       ComboBox.qml
│   │   │       CursorDelegate.qml
│   │   │       DelayButton.qml
│   │   │       Dial.qml
│   │   │       Dialog.qml
│   │   │       DialogButtonBox.qml
│   │   │       Drawer.qml
│   │   │       ElevationEffect.qml
│   │   │       Frame.qml
│   │   │       GroupBox.qml
│   │   │       ItemDelegate.qml
│   │   │       Label.qml
│   │   │       Menu.qml
│   │   │       MenuBar.qml
│   │   │       MenuBarItem.qml
│   │   │       MenuItem.qml
│   │   │       MenuSeparator.qml
│   │   │       Page.qml
│   │   │       PageIndicator.qml
│   │   │       Pane.qml
│   │   │       plugins.qmltypes
│   │   │       Popup.qml
│   │   │       ProgressBar.qml
│   │   │       qmldir
│   │   │       qtquickcontrols2materialstyleplugin.dll
│   │   │       RadioButton.qml
│   │   │       RadioDelegate.qml
│   │   │       RadioIndicator.qml
│   │   │       RangeSlider.qml
│   │   │       RectangularGlow.qml
│   │   │       RoundButton.qml
│   │   │       ScrollBar.qml
│   │   │       ScrollIndicator.qml
│   │   │       Slider.qml
│   │   │       SliderHandle.qml
│   │   │       SpinBox.qml
│   │   │       StackView.qml
│   │   │       SwipeDelegate.qml
│   │   │       SwipeView.qml
│   │   │       Switch.qml
│   │   │       SwitchDelegate.qml
│   │   │       SwitchIndicator.qml
│   │   │       TabBar.qml
│   │   │       TabButton.qml
│   │   │       TextArea.qml
│   │   │       TextField.qml
│   │   │       ToolBar.qml
│   │   │       ToolButton.qml
│   │   │       ToolSeparator.qml
│   │   │       ToolTip.qml
│   │   │       Tumbler.qml
│   │   │
│   │   └───Universal
│   │           ApplicationWindow.qml
│   │           BusyIndicator.qml
│   │           Button.qml
│   │           CheckBox.qml
│   │           CheckDelegate.qml
│   │           CheckIndicator.qml
│   │           ComboBox.qml
│   │           DelayButton.qml
│   │           Dial.qml
│   │           Dialog.qml
│   │           DialogButtonBox.qml
│   │           Drawer.qml
│   │           Frame.qml
│   │           GroupBox.qml
│   │           ItemDelegate.qml
│   │           Label.qml
│   │           Menu.qml
│   │           MenuBar.qml
│   │           MenuBarItem.qml
│   │           MenuItem.qml
│   │           MenuSeparator.qml
│   │           Page.qml
│   │           PageIndicator.qml
│   │           Pane.qml
│   │           plugins.qmltypes
│   │           Popup.qml
│   │           ProgressBar.qml
│   │           qmldir
│   │           qtquickcontrols2universalstyleplugin.dll
│   │           RadioButton.qml
│   │           RadioDelegate.qml
│   │           RadioIndicator.qml
│   │           RangeSlider.qml
│   │           RoundButton.qml
│   │           ScrollBar.qml
│   │           ScrollIndicator.qml
│   │           Slider.qml
│   │           SpinBox.qml
│   │           StackView.qml
│   │           SwipeDelegate.qml
│   │           Switch.qml
│   │           SwitchDelegate.qml
│   │           SwitchIndicator.qml
│   │           TabBar.qml
│   │           TabButton.qml
│   │           TextArea.qml
│   │           TextField.qml
│   │           ToolBar.qml
│   │           ToolButton.qml
│   │           ToolSeparator.qml
│   │           ToolTip.qml
│   │           Tumbler.qml
│   │
│   ├───Templates.2
│   │       plugins.qmltypes
│   │       qmldir
│   │       qtquicktemplates2plugin.dll
│   │
│   └───Window.2
│           plugins.qmltypes
│           qmldir
│           windowplugin.dll
│
├───QtQuick.2
│       plugins.qmltypes
│       qmldir
│       qtquick2plugin.dll
│
├───scenegraph
│       qsgd3d12backend.dll
│
├───styles
│       qwindowsvistastyle.dll
│
├───translations
│       qt_ar.qm
│       qt_bg.qm
│       qt_ca.qm
│       qt_cs.qm
│       qt_da.qm
│       qt_de.qm
│       qt_en.qm
│       qt_es.qm
│       qt_fi.qm
│       qt_fr.qm
│       qt_gd.qm
│       qt_he.qm
│       qt_hu.qm
│       qt_it.qm
│       qt_ja.qm
│       qt_ko.qm
│       qt_lv.qm
│       qt_pl.qm
│       qt_ru.qm
│       qt_sk.qm
│       qt_uk.qm
│
└───virtualkeyboard
        qtvirtualkeyboard_hangul.dll
        qtvirtualkeyboard_openwnn.dll
        qtvirtualkeyboard_pinyin.dll
        qtvirtualkeyboard_tcime.dll
        qtvirtualkeyboard_thai.dll

[KH-219Design]

@just_a_developer Sorry tweaking the arguments didn't help.

What about watching what Qt is printing when you launch the exe?

I would still expect there is a warning or an error printed that would clarify what exactly is going wrong.

[just_a_developer]

A bit more info :
Here is the output of the app when I run it with QML_IMPORT_TRACE=1 :

> set QML_IMPORT_TRACE=1

> QtCreatorScrollProject.exe
warning: Environment variable QT_LOGGING_TO_CONSOLE is deprecated, use
QT_ASSUME_STDERR_HAS_CONSOLE and/or QT_FORCE_STDERR_LOGGING instead.
QQmlImportDatabase::addImportPath: "C:/Users/User/Downloads/6/6/qml"
QQmlImportDatabase::addImportPath: "qrc:/qt-project.org/imports"
QQmlImportDatabase::addImportPath: "C:/Users/User/Downloads/6/6"
QQmlImports(qrc:/main.qml)::addLibraryImport: "QtQuick" 2.12 as ""
QQmlImports(qrc:/main.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick.2/qmldir"
QQmlImportDatabase::registerPluginTypes: "QtQuick" from "C:/Users/User/Downloads/6/6/QtQuick.2"
QQmlImports(qrc:/main.qml)::addLibraryImport: "QtQuick.Controls" 2.5 as ""
QQmlImports(qrc:/main.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Controls.2/qmldir"
QQmlImportDatabase::registerPluginTypes: "QtQuick.Controls" from "C:/Users/User/Downloads/6/6/QtQuick/Controls.2"
QQmlImports(qrc:/main.qml)::addLibraryImport: "QtQuick" 2.0 as "QmlInternals"
QQmlImports(qrc:/main.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick.2/qmldir"
QQmlImports(qrc:/main.qml)::resolveType: "ScrollView" => "" QUrl("qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml") TYPE/URL
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::addLibraryImport: "QtQuick" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::addLibraryImport: "QtQuick.Controls" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Controls.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::addLibraryImport: "QtQuick.Controls.impl" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::addLibraryImport: "QtQuick.Templates" 2.12 as "T"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Templates.2/qmldir"
QQmlImportDatabase::registerPluginTypes: "QtQuick.Templates" from "C:/Users/User/Downloads/6/6/QtQuick/Templates.2"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::resolveType: "ScrollBar" => "" QUrl("qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml") TYPE/URL
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::addLibraryImport: "QtQuick" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::addLibraryImport: "QtQuick.Controls" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Controls.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::addLibraryImport: "QtQuick.Controls.impl" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::addLibraryImport: "QtQuick.Templates" 2.12 as "T"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Templates.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "Transition" => "QQuickTransition" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "Rectangle" => "QQuickRectangle" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "NumberAnimation" => "QQuickNumberAnimation" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "T.ScrollBar" => "QQuickScrollBar" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "SequentialAnimation" => "QQuickSequentialAnimation" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "PauseAnimation" => "QQuickPauseAnimation" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "State" => "QQuickState" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::resolveType: "PropertyChanges" => "QQuickPropertyChanges" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml)::addImplicitImport
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::resolveType: "T.ScrollView" => "QQuickScrollView" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::addImplicitImport
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::resolveType: "ScrollBar" => "" QUrl("qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml") TYPE/URL
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollView.qml)::resolveType: "ScrollBar" => "" QUrl("qrc:/qt-project.org/imports/QtQuick/Controls.2/ScrollBar.qml") TYPE/URL
QQmlImports(qrc:/main.qml)::resolveType: "ListView" => "QQuickListView" TYPE
QQmlImports(qrc:/main.qml)::resolveType: "ApplicationWindow" => "" QUrl("qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml") TYPE/URL
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::addLibraryImport: "QtQuick" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::addLibraryImport: "QtQuick.Window" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Window.2/qmldir"
QQmlImportDatabase::registerPluginTypes: "QtQuick.Window" from "C:/Users/User/Downloads/6/6/QtQuick/Window.2"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::addLibraryImport: "QtQuick.Controls" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Controls.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::addLibraryImport: "QtQuick.Controls.impl" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::addLibraryImport: "QtQuick.Templates" 2.12 as "T"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Templates.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::resolveType: "Rectangle" => "QQuickRectangle" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::resolveType: "T.ApplicationWindow" => "QQuickApplicationWindow" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ApplicationWindow.qml)::addImplicitImport
QQmlImports(qrc:/main.qml)::resolveType: "ItemDelegate" => "" QUrl("qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml") TYPE/URL
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::addLibraryImport: "QtQuick" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::addLibraryImport: "QtQuick.Controls" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Controls.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::addLibraryImport: "QtQuick.Controls.impl" 2.12 as ""
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::addLibraryImport: "QtQuick.Templates" 2.12 as "T"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::importExtension: loaded "C:/Users/User/Downloads/6/6/QtQuick/Templates.2/qmldir"
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::resolveType: "IconLabel" => "QQuickIconLabel" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::resolveType: "T.ItemDelegate" => "QQuickItemDelegate" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::resolveType: "Rectangle" => "QQuickRectangle" TYPE
QQmlImports(qrc:/qt-project.org/imports/QtQuick/Controls.2/ItemDelegate.qml)::addImplicitImport
QQmlImports(qrc:/main.qml)::resolveType: "QmlInternals.Component" => "QQmlComponent" TYPE
QQmlImports(qrc:/main.qml)::addImplicitImport

Also : "Accessibility Insights for Windows" app shows that there is something there, it is just not visible :

[KH-219Design]

@just_a_developer said in Qml contents doesn't appear under Windows:

"Accessibility Insights for Windows"

Wow! Bravo to "Accessibility Insights for Windows" . That's an amazing trick.

I noticed that earlier you mentioned that the machine where the problem occurs is a VM. I wonder if there is just an OpenGL problem/glitch due to the virtualization. Are there VM options/settings you can play with, like assigning your GPU, or toggling through various graphics acceleration options?

[just_a_developer]

@KH-219Design said in Qml contents doesn't appear under Windows:

@just_a_developer said in Qml contents doesn't appear under Windows:

"Accessibility Insights for Windows"

Wow! Bravo to "Accessibility Insights for Windows" . That's an amazing trick.

I noticed that earlier you mentioned that the machine where the problem occurs is a VM. I wonder if there is just an OpenGL problem/glitch due to the virtualization. Are there VM options/settings you can play with, like assigning your GPU, or toggling through various graphics acceleration options?

"Are there VM options/settings you can play with, like assigning your GPU, or toggling through various graphics acceleration options?"
I am not sure if there is anything that I could do... It is a machine in vSphere and I don't really see any options that I could change which could be relevant...

But : here is a bit more info :

• the app works well under a Windows7 VM (everything appears, including QML contents)
• the app doesn't show the QML contents under Windows8 and Windows10 VMs (empty window - QML contents doesn't appear)

Here is the context of the Windows7 VM (as shown by OpenGL Extension Viewer), where the QML contents does appear :

Here is the context of the Windows10 VM (as shown by OpenGL Extension Viewer), where the QML contents doesn't appear :

[just_a_developer]

OK : I got the fix : it is a rendering issue.

When I force rendering via ANGLE, it works : Options for forcing rendering via ANGLE :
1.: setting the QT_OPENGL environment variable to angle . (I only tested this solution, and it works well.)
2.: compile Qt with configure ... -angle .
3.: call QCoreApplication::setAttribute(Qt::AA_UseOpenGLES); before creating the QApplication object .

There is still an interesting thing : based on Qt's documentation, Qt libraries are compiled with -opengl dynamic which means that Qt should fallback to using the ANGLE renderer by itself (without me having to forcefully ask it to do that).
Ref.: https://doc.qt.io/qt-5/windows-requirements.html#graphics-drivers
Ref2.: https://doc.qt.io/qt-5/configure-options.html#opengl-options-for-windows

So it seems like that this fallback mechanism is broken.

( A bit more info about the different renderers : https://wiki.qt.io/Qt_5_on_Windows_ANGLE_and_OpenGL )