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How To Fix Qt Platform Plugin Windows



It said: This application failed to start because it could not find or load the Qt platform plugin “windows” in “”. Reinstalling the application may fix this problem. My current Windows 10 is version 1703, OS build 15063.674. I knew OneDrive is the builtin with Windows 10. It can not be uninstall like a normal program.

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Comments

commented May 27, 2017

It is not starting

Latest 32bit version

error message: Application failed to start because platform plugin “windows” is missing

changed the title Application failed to start because platform plugin “windows” is missingMay 27, 2017
closed this May 27, 2017
changed the title-May 27, 2017
reopened this May 27, 2017

commented May 30, 2017

How to fix qt platform plugin windows 10

Hi, can you suggest a solution?

commented May 30, 2017

Did you unpack all files from zip archive? Including qt.conf and platformsqwindows.dll? Maybe you copied exe file somewhere else and didn't copy other dll/conf files with it?

commented May 31, 2017

Yes, i just unpacked zip archive (whole files) and rclonebrowser was not started with that message, maybe packed dll files are wrong?

commented May 31, 2017

Hmm, I am pretty sure all dll files are in the zip. I am able to run 32-bit exe just fine on 32-bit win7 (clean win installation in VM, no previous software).

Are you sure you unpacked all files when running exe, and you are not running from explorer 'zip' folder (it opens zip files as folders)?

Can you try running cmd.exe then setting path to platforms folder to QT_QPA_PLATFORM_PLUGIN_PATH variable like this:

and then execute RcloneBrowser.exe like this (in same window):

Does it run like this?

Another thing to try is DebugView: https://technet.microsoft.com/en-us/sysinternals/debugview.aspx

  1. download & run it

  2. open cmd.exe and execute:

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    set QT_DEBUG_PLUGINS=1
    C:pathtoRcloneBrowser.exe

  3. Go to debug View and save log, and paste it here.

Maybe you can show screenshot of folder structure you are running exe from?

commented May 31, 2017
edited

hi, it same, i did as you described, could this problem related with my version of windows which is Vista?

here debug log
[7520] QFactoryLoader::QFactoryLoader() checking directory path 'C:/rclone-browser/platforms' ..
[7520] QFactoryLoader::QFactoryLoader() checking directory path 'C:/rclone-browser' ..
[7520] QFactoryLoader::QFactoryLoader() checking directory path 'C:/rclone-browser/platforms/platforms' ..
[7520] QFactoryLoader::QFactoryLoader() checking directory path 'C:/rclone-browser/platforms' ..
[7520] This application failed to start because it could not find or load the Qt platform plugin 'windows'
[7520] in 'c:rclone-browserplatforms'.
[7520]
[7520] Reinstalling the application may fix this problem.
[7520] Error -
[7520] RtlWerpReportException failed with status code :-1073741772. Will try to launch the process directly
[7520]

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commented May 31, 2017
edited

Oh, Vista. I was not thinking about it at all.. Now when I run it in Vista VM I get exactly same error. I'll need to check what I need to change to support it on Vista. It should be possible to run it under Vista.

commented Jun 1, 2017

Thanks, but if this related with old vista, dont spend your time for this because i think there is possibly no solution.

Qt Plugin Windows Missing

commented Jun 1, 2017
edited

It seems Qt supports Vista only up to 5.6 version: https://doc.qt.io/qt-5/supported-platforms-and-configurations.html

I've build binary with Qt 5.6, can you please try it out and let me know if it works: https://drive.google.com/uc?export=download&id=0B6NdBDx_PciXV3FiSTNZRWxja3M

If it works, I can simply use Qt 5.6 for 32-bit builds.
There is only one minor difference from newer Qt versions - GUI doesn't refresh remote list automatically after rclone console is closed (when 'Config' button is pressed). That was I just simply disabled so I can build new binary quickly.

commented Jun 1, 2017

Thank you you are so kind, QT 5.6 build is working.

closed this Jul 1, 2017
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Active8 months ago

I am implementing qgis 3.4.3 in a custom application, but when I instantiate the QgsApplication() class, I receive the error 'Could not find the Qt platform plugin 'Windows' in '.

I've attempted using various installs of qgis 3.x+ including the standalone installer and OSGeo4W web installer. I currently am sticking with the OSGeo4W web installer installation. I am using a Python 3.7 installation separate from what comes with OSGeo4W and attempting to integrate qgis functionality.

I have followed the instructions in the following QGIS help doc under the section: 'Using PyQGIS in Custom Applications'https://docs.qgis.org/2.18/en/docs/pyqgis_developer_cookbook/intro.html#run-python-code-when-qgis-starts

After attempting to run the script I realized a dll plugin was missing. After some research, I found its the qwindows.dll that qt uses. The qwindows.dll is included in the OSGeo4W installation under: C:OSGeo4WappsQt5pluginsplatforms

I changed the QT_PLUGIN_PATH variable on the local command prompt to include the directory above, but the same error prevailed. I also changed the QT_DEBUG_PLUGINS variable to 1 which printed out the locations Qt is looking for plugins. Interestingly, it wasn't looking for plugins in the path I specified in the QT_PLUGIN_PATH variable.

Python Code:

Batch File Code to Start Cmd Prompt with Proper Variables:

I expect to run the python script and receive no errors since I'm pointing to the directory where the qwindows.dll missing plugin is stored. However, I am still receiving the missing windows plugin error.

Here is the actual message with QT_DEBUG_PLUGINS set to 1:QFactoryLoader::QFactoryLoader() checking directory path 'C:/OSGeo4W/apps/qgis/qtplugins/platforms' ..QFactoryLoader::QFactoryLoader() checking directory path 'C:/OSGeo4W/apps/Python37/platforms' ..qt.qpa.plugin: Could not find the Qt platform plugin 'windows' in 'This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Matt Brauer

How To Fix Qt Platform Plugin Windows Missing

Matt BrauerMatt Brauer

1 Answer

How To Fix Qt Platform Plugin Windows

Add the following environment variables at the beginning of your python script before loading qgis.core:

The QT_QPA_PLATFORM_PLUGIN_PATH variable is used by Qt to look up certain drivers including the qwindows.dll. It doesn't know the path to the '~qgis directoryappsQt5plugins' directory, so you need to provide it before using the QgsApplication module imported from qgis.core.

In order for your local version of python to find the qgis.core directory, you will also need to add the following qgis directories to your script before loading qgis.core:

How To Fix Qt Platform Plugin Windows

How To Fix Qt Platform Plugin Windows 10

Matt BrauerMatt Brauer

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