Unknown platform: CYGWIN_NT-10.0-WOW

[sharuzzaman]

Bug Report

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Context

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I'm testing appJar with Python in Cygwin

Expected Behaviour

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appJar should run

Actual Behaviour

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appJar does not run

Any error messages produced by appJar

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$ ./main.py
Traceback (most recent call last):
File "./main.py", line 6, in
app = gui()
File "/cygdrive/c/Users/sharuzzr/Downloads/app/appJar/appjar.py", line 438, in init
self.platform = gui.GET_PLATFORM()
File "/cygdrive/c/Users/sharuzzr/Downloads/app/appJar/appjar.py", line 265, in GET_PLATFORM
raise Exception("Unknown platform: " + platform())
Exception: Unknown platform: CYGWIN_NT-10.0-WOW

Sample code, demonstrating the issue

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$ cat main.py
#!/bin/env python

import the library

from appJar import gui

create a GUI variable called app

app = gui()

What steps are needed to reproduce the bug

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1. Install Cygwin
2. Install Python 2.7 package in Cygwin
3. Create main.py like above
4. ./main.py

Version Information

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$ python main.py -v
appJar: 0.93.0 Python: 2.7.14 TCL: 8.6, TK: 8.6 Platform: CYGWIN_NT-10.0-WOW
pid: 16036 locale: en_US

[jarvisteach]

Hi @sharuzzaman - thanks for raising this.

There are lots of platform specific sections inside appJar, trying to keep the same functionality across MAC/WINDOWS/LINUX - so, the first thing appJar does, is determine a platform.

I've not really come across CYGWIN before - I've just googled it, and it looks like a "linux emulator" running inside Windows.

So, if appJar finds CYGWIN I'll configure it to set Windows as the platform, I'm assuming all the Windows functionality will still be available?

[sharuzzaman]

So, if appJar finds CYGWIN I'll configure it to set Windows as the platform, I'm assuming all the Windows functionality will still be available?

Not really. Cygwin tries to map Linux/Unix API call to Windows equivalent using an emulated library. From Unix application point of view after being compiled in Cygwin, it is a Linux application. So I believe Cygwin should be best under Linux family, but some features might not be 100% available for Cygwin application.

I have tried to put Cygwin under Linux platform, but the code returns nothing.

@staticmethod
def GET_PLATFORM():
""" returns one of the gui class's three static platform variables """
if platform() in ["win32", "Windows"]:
return gui.WINDOWS
elif platform() == "Darwin":
return gui.MAC
elif platform() in ["Linux", "FreeBSD","CYGWIN_NT-10.0-WOW"]:
return gui.LINUX
else:
raise Exception("Unknown platform: " + platform())

sharuzzr@laptop /cygdrive/C/Users/sharuzzr/Downloads/app
$ ./main.py
Traceback (most recent call last):
File "./main.py", line 6, in
app = gui()
File "/cygdrive/C/Users/sharuzzr/Downloads/app/appJar/appjar.py", line 533, in init
self.topLevel = Tk()
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1819, in init
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable

sharuzzr@laptop /cygdrive/C/Users/sharuzzr/Downloads/app
$ export DISPLAY=:0

sharuzzr@laptop /cygdrive/C/Users/sharuzzr/Downloads/app
$ ./main.py

changing the return to gui.WINDOWS also show nothing

I think this might be related to Tk library as well. Maybe Cygwin should use Tk in Cygwin rather than Tk in Windows or Linux

[jarvisteach]

Difficult one, I don't have an environment right now where I can test this.

But the fix would have been to either have GET_PLATFORM() return gui.LINUX' or 'gui.WINDOWS

If both of those fail, then it's going to be a bigger problem!

[jarvisteach]

I've had a quick google, and found the following site: https://daddyathouse76.wordpress.com/2017/06/10/python-gui-on-cygwin/

Are you running an X server within CYGWIN? If not, that'll explain the no display error...

[jarvisteach]

Hi @sharuzzaman - I was wondering if this had given you any help?