I have a Qt application, which runs fine when I execute it from Qt Creator. However, on running it by manually clicking the generated exe, I get the following error :
I would understand if it would ask for missing DDLs (which I could then place in the same folder). But how should I proceed to handle this (in general) ?
P.S. It is not giving any line number in my source code which I could try testing this assert for. I tried using the release mode as well, but the same error.
On
We don't know what the problem with your code is; you'll need to use a debugger to find that out. I think that the pre-built Qt libraries that you download come with debug symbols, but if they don't, you can always build Qt yourself to get them using the -force-debug-info configure option.
You can also use DebugView to see debug output of deployed applications.
However, in general, you should use the windeployqt tool that is included with Qt.
The Qt for Windows - Deployment page has more information about deploying Qt applications to Windows machines, but windeployqt should do everything you need.
My qml files were not getting deployed properly and thus this error (this assert is probably on the variable storing the main qml file name, i.e. it should not be an empty string, which in case of missing main.qml, it was). Placing the qml files at correct paths solved the issue.
Also, as @mitch has pointed out in his answer, use windeployqt to find out the dependencies. Although, I have also realized that it doesn't cover all the dependencies (MSVC runtimes for example and other compiler related files sometimes). In that case run the dependency walker and place the missing files manually along with the exe.