[PyQt] PyQt5 for Python 2.7 on Windows 10

[Barry Scott]

That appears to be the case. Some people report that you can get away with mixing RTL versions.
But others report strange crashes.

Barry

> On 1 Jun 2017, at 20:56, Nathan Warmerdam <nbwarmerdam at integrated-informatics.com> wrote:
> 
> Would this then mean that I would need to also build Qt myself with the VS for python as well?  To avoid any incompatibilities?
>  
>  
> From: Barry Scott <barry at barrys-emacs.org>
> Date: Wednesday, May 31, 2017 at 11:52 AM
> To: Nathan Warmerdam <nbwarmerdam at integrated-informatics.com>
> Cc: "pyqt at riverbankcomputing.com" <pyqt at riverbankcomputing.com>
> Subject: Re: [PyQt] PyQt5 for Python 2.7 on Windows 10
>  
>  
>> On 31 May 2017, at 01:30, Nathan Warmerdam <nbwarmerdam at integrated-informatics.com <mailto:nbwarmerdam at integrated-informatics.com>> wrote:
>>  
>> Hello All,
>>  
>> 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.
>  
> That is the wrong VS version for python2.7, unless you rebuilt python 2.7 and all extensions using VS2015 you might hit bugs because of  problems with C RTL cross version mixing that does not work in all cases.
>  
> This is version you need if you are using binaries from pyton.org <http://pyton.org/>: https://www.microsoft.com/en-gb/download/details.aspx?id=44266 <https://www.microsoft.com/en-gb/download/details.aspx?id=44266>
> (google visual studio for python)
>  
>  
> Barry
>  
>  
>>  
>> 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. 
>>  
>> However when attempting to get it to run on a Windows 10 I have run into the dreaded:
>> This application failed to start because it could not find or load the Qt platform plugin “windows”
>>  
>> This is usually a sign that the qt.conf is bad but why would it work on Windows 8 but not Windows 10?  Furthermore it does not work even if I put a qt.conf file right next to the python.exe.
>>  
>> 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:
>>  
>> import os
>> import sys
>> dir_name = os.path.dirname(__file__)
>>  
>> _path = os.path.dirname(__file__) + '\\Qt\\bin;' + os.environ['PATH']
>> os.environ['PATH'] = _path
>>  
>> os.environ['QML_IMPORT_PATH'] = os.path.join(dir_name, 'Qt', 'qml')
>> os.environ['QML2_IMPORT_PATH'] = os.path.join(dir_name, 'Qt', 'qml')
>>  
>> os.environ['QT_PLUGIN_PATH'] = os.path.join(dir_name, 'Qt', 'plugins')
>>  
>> os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = os.path.join(dir_name, 'Qt', 'plugins', 'platforms')
>>  
>> However the message persists.
>>  
>> 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?
>>  
>> With respect,
>> Nathan
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> 

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