Platform not recognised by one appl on same machine

gkavrecic

I've tried to move own 2 apps to an Windows 2008 (not R2) server.

facts:

both appls work on other machines (2008 R2, 2012)
both compiled on same machine with same kit: Qt 5.10, commercial license, mingw 5.3, 32bit
APPL1 works
APPL2 complains about not finding the "windows" plugin
no QT_PLUGIN_PATH on the machine

tried:

unifying DLLs - same issue
copied APPL2 exe in APPL1 folder - same issue
APPL1 in folder 2 works

Any advice?

jsulm

@gkavrecic Did you deploy your apps before moving? See https://doc.qt.io/qt-5/windows-deployment.html

JonB

@gkavrecic
I don't know if there is something special about "the "windows" plugin", but the usual way of diagnosing plugin issue is to set environment variable set QT_DEBUG_PLUGINS=1 and then run your executable to see diagnostic output. However for Windows possibly read through https://forum.qt.io/topic/41943/platform-plugin-windows, I don't know.

gkavrecic

@jsulm I did used the windeployqt, but it gave me wrong files - e.g. an outdated libstdc++6.dll
So I copied manually what was working elsewhere.

gkavrecic

@JonB from the debug I can see that it finds the DLL, it contains the metadata asQWindowsIntegrationPlugin, and can't find the procedure ""!

gkavrecic

@gkavrecic said in Platform not recognised by one appl on same machine:

@jsulm I did used the windeployqt, but it gave me wrong files - e.g. an outdated libstdc++6.dll
So I copied manually what was working elsewhere.

On top of this: the copied DLL was not from the actual bin folder, not even from any QT kit or Windows folders, but from another project (which is contained in the PATH)

edit: libstdc++-6.dll, libgcc_s_dw2-1.dll, libgcc_s_sjlj-1.dll are all taken from PATH and not from actual compiler folder.
I would consider this a bug.

Even after copying DLLs from the actual MinGW bin folder the error is still the same