Could not find Qt platform plugin "windows" in "C:\Program Files\GNURadio-3.8\bin\\plugins\platforms"

[WA1CYB]

Installed 3.8.1 without issues
Ran GRC
Loaded a QT frequency sink in a flowgraph
Received this error message:
qt.qpa.plugin: Could not find Qt platform plugin "windows" in "C:\Program Files\GNURadio-3.8\bin\plugins\platforms"
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Done (return code -1073740791)

Is the \plugins\platforms meant to be a UNC Network path?

[gnieboer]

Sorry, I could not duplicate.
That directory should exist, having been created during install, not a UNC path.
There should be a file in that directory called "qwindows.dll". Does that exist?

[WA1CYB]

The file exists. It appears your script put a double backslash, instead of a single one so the dll can't be found. "C:\Program Files\GNURadio-3.8\bin\\plugins\platforms"  instead of  "C:\Program Files\GNURadio-3.8\bin\plugins\platforms" In the "C:\Program Files\GNURadio-3.8\bin\plugins\platforms" directory there are the dll's:  qdirect2d.dll qwindows.dll qoffscreen.dll and qminimal.dll On Thursday, July 23, 2020, 04:03:29 PM EDT, Geof Nieboer <notifications@github.com> wrote: Sorry, I could not duplicate. That directory should exist, having been created during install, not a UNC path. There should be a file in that directory called "qwindows.dll". Does that exist? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

[gnieboer]

Well, you can remove the / before /plugins in the run_gr.bat file, but that really shouldn't be having an effect. Windows ignores the extra slashes when it finds them (enter cd c:\windows\\system to confirm).

Those are the correct DLL's, so that part is good.

Let me know if the slash removal works.

[fksms]

The problem can be avoided by editing "C:\Program Files\GNURadio-3.8\bin\run_gr.bat".

"set QT_QPA_PLATFORM_PLUGIN_PATH=%~dp0\platforms"
"set QT_PLUGIN_PATH=%~dp0..\plugins"

Please change as above and save.
It should work correctly.

I made a pull request to solve this problem.
See #49.

[JochemsMatz]

I can confirm that this fix worked for me with GNU RC 3.8.1.0 under Windows 10.

[busycraftsman]

I have the same problem, I solved this problem by create a plugins folder in ".\GNURadio-3.8\bin", and move the platforms folder into the plugins folder.

I think this is a wrong package script cause this problem.

[gnieboer]

A new windows installer for 3.8.2 has been released here that sorts this path issue out.

If further issues are discovered, please open a new issue (as it should be a different root cause)

[AhmedKAwwad]

The problem can be avoided by editing "C:\Program Files\GNURadio-3.8\bin\run_gr.bat".

"set QT_QPA_PLATFORM_PLUGIN_PATH=%~dp0\platforms"
"set QT_PLUGIN_PATH=%~dp0..\plugins"

Please change as above and save.
It should work correctly.

I made a pull request to solve this problem.
See #49.

Actually worked for me Thanks a lot