[PyQt] PyQt5 for Python 2.7 on Windows 10

[Nathan Warmerdam]

Hey Elvis,
That was a good idea, thank you.  Dependency Walker isn’t exactly perfect on Windows 10 but its still useable.  Unfortunately I didn’t see anything blatantly obvious as missing.
Thanks again,
Nathan

From: Elvis Stansvik <elvstone at gmail.com>
Date: Wednesday, May 31, 2017 at 11:38 PM
To: Nathan Warmerdam <nbwarmerdam at integrated-informatics.com>
Cc: PyQT mailing list <pyqt at riverbankcomputing.com>
Subject: Re: [PyQt] PyQt5 for Python 2.7 on Windows 10


Den 31 maj 2017 2:31 fm skrev "Nathan Warmerdam" <nbwarmerdam at integrated-informatics.com<mailto:nbwarmerdam at integrated-informatics.com>>:
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> Hello All,
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> I have built (with commercial license) PyQt5 for python 2.7.  I used VS 2015 and packaged my build with what I believe to be the appropriate windows redistributables.
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> With the resulting build I have had success getting it to run on an independent (i.e. not the build machine) Windows 8.1 machine.
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> However when attempting to get it to run on a Windows 10 I have run into the dreaded:
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> This application failed to start because it could not find or load the Qt platform plugin “windows”
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>
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> This is usually a sign that the qt.conf is bad but why would it work on Windows 8 but not Windows 10?

The other option is that it is found, but cannot be loaded for some reason.

Perhaps take a look at qwindows.dll with Dependency Walker on the Win 10 machine (or dumpbin /dependents from a VS command prompt if you have one) to see if something is missing, though I expect the dependencies to be minimal.

Elvis

Furthermore it does not work even if I put a qt.conf file right next to the python.exe.
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> I have followed the file structure used by Phil in the Python 3 version of PyQt5 (e.g. PyQt5\Qt\bin and PyQt5\plugins, etc) and modified the __init__.py file to set various environment variables.  Like this:
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> import os
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> import sys
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> dir_name = os.path.dirname(__file__)
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> _path = os.path.dirname(__file__) + '\\Qt\\bin;' + os.environ['PATH']
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> os.environ['PATH'] = _path
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> os.environ['QML_IMPORT_PATH'] = os.path.join(dir_name, 'Qt', 'qml')
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> os.environ['QML2_IMPORT_PATH'] = os.path.join(dir_name, 'Qt', 'qml')
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> os.environ['QT_PLUGIN_PATH'] = os.path.join(dir_name, 'Qt', 'plugins')
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> os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = os.path.join(dir_name, 'Qt', 'plugins', 'platforms')
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> However the message persists.
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> As I said, it works on independent Windows 8.1 machines but not with Windows 10.  Does anyone have any tips or experience or success with PyQt5 for python 2.7 on Windows 10?
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> With respect,
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> Nathan
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>
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