QMainWindow based app dissapears in release

JohnCu

Hi, I have just built an app, based on QMainwindow in release mode (x64) in visual studio 2019. I have also used "windeployqt.exe --quick ." command via QT x64 command. While launching I was prompted to provide a few dlls: Qt5PrintSupport.dll, and 2 other libraries. After launching the app, it works well, and after pressing some buttons, and performing part of necessary operations (as well as associated data visualization) the GUI simply disappears.
Are there any tools to track the problem down?
In visual studio in debug and release everything is fine. Only launching app as a standalone .exe file the problem occurs.
Thanks

JonB

@JohnCu
Very small chance of an error being reported in Event Viewer, you should at least check there.

J.Hilk

@JohnCu said in QMainWindow based app dissapears in release:

--quick

so you use qml in your app ?
give the deployment tool the path to your qml files via --qmlDir

JohnCu

@J-Hilk No, I dont think so. So how should windeployqt.exe call look like, assuming that I am not using qml?

J.Hilk

@JohnCu
I may have miss understood.

You do not use QML?
What as your exact windeployqt command ?

JohnCu

@J-Hilk I am not using QML. I wrongly used --quick option. So how should I use it in a correct way? How windeployqt command should look like?

JohnCu

@JonB
I found something like that... What does it mean?
I performed following cmd commands:
sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth
But the problem still exists...

JonB

@JohnCu
It means your program crashed! It has a memory access violation (e.g. bad pointer value) at offset 0x02f5da in the executable. Which probably won't help you much to track it down in the source code, but at least you know why it is disappearing!

JohnCu

@JonB Ok! I will try to track it down ! however in debug mode/release mode in visual there is no such issue...

JKSH

@JohnCu said in QMainWindow based app dissapears in release:

in debug mode/release mode in visual there is no such issue...

Here's a starting point: https://exceptionshub.com/program-only-crashes-as-release-build-how-to-debug.html