App released with windeployqt not showing UI

jsulm

@Fausto01 I would also check the anti-virus software - could be that it blocks the app.

Fausto01

@jsulm I thought the same thing but no antivirus is installed on that machine. The app is running because I can see it from the Task Manager, but the UI doesn't want to come up.

J.Hilk

@Fausto01 is it maybe a VM? thats always not working quite right

also make sure that PC has the up to date graphics drivers installed

Fausto01

@J-Hilk It's a native Windows 10 Pro, I'll try to update graphics drivers. Unfortunately I don't have the PC right now. I'll keep you updated. If you have other suggestions I will try

Fausto01

I've tried to set QT_DEBUG_PLUGINS=1 and run the application from terminal (even started as admin) but nothing has changed. I also checked the drivers and it is all updated. Any hint?

JonB

@Fausto01
You should have received a lot of diagnostic output in the terminal... ?

Fausto01

@JonB I've also tried to set CONFIG+=console in the .pro but the only thing that is shown on the terminal is "QML debugging is enabled. Only use this in a safe environment.". Than the app remains alive but with no GUI

Fausto01

Update: I've tried to create a file just after the creation of QApplication but the file was not created. Seems that the application stucks in the creation of QApplication, is it possible? I think I miss some dll but I don't know which one.

Fausto01

Guys please I'm stucked and I need to resolve asap, has someone something to try? Thak you

hskoglund

Hi, the failing PC, is it a portable PC with Intel integrated graphics adapter?

SGaist

Hi,

One thing that is strange is your qmldir option. It should be pointed to your application sources where you store your QML files so that their dependencies are all deployed.

It looks a bit unrelated since you have your application showing on some machines but still, it would be better to fix it.

Fausto01

@hskoglund Yes it has no dedicated graphic board.

Fausto01

@SGaist The batch file with the commands for releasing the app is at the same level of the qml directory, something like this:

└── Project/
    ├── release.bat
    ├── qml/
    │   └── main.qml
    └── src/
        └── main.cpp

hskoglund

I had same problem using QML on a Windows 10 portable PC with an integrated Intel graphics adapter. The solution that worked for me was to upgrade the graphics driver to the latest version from Intel. maybe it will help you also.

Fausto01

@hskoglund Seems that it's already the newest version (from Windows Update)

hskoglund

Windows Update didn't work for me, I had to go to the Intel website and fetch the driver there.

kkoehne

@Fausto01 said in App released with windeployqt not showing UI:

I've tried to set QT_DEBUG_PLUGINS=1 and run the application from terminal (even started as admin) but nothing has changed. I also checked the drivers and it is all updated. Any hint?

Windows GUI apps do not have a console by default, and therefore also do not write debug information to the console. Instead, it goes to the central 'debug buffer'. You can see the output of the buffer by a) launching your app in an IDE like Qt Creator, or b) run the standalone dbgview.exe.

(Caveat: Only one client should listen to the debug buffer at any given time on the whole machine.)

Try this, and setting QT_DEBUG_PLUGINS environment variable should really print you a lot of information.

Fausto01

Thank you guys, I'll try and give you an update asap

Fausto01

@kkoehne I've tried but nothing appears again. My application is compiled in release mode, do I have to build it in debug mode to see the output from dbgview?

JonB

@Fausto01
You should not need to compile for Debug in order to get the diagnostic output from setting environment variable QT_DEBUG_PLUGINS=1 when you run your application. Are you sure you did this correctly before launching your program, so many people seem to get this wrong?