Maybe i could use another trick to circumvent the problems in the
frozen app? The frozen apps can be downloaded here:
https://sourceforge.net/projects/panconvert/files/Newest/
@Cameron:
1. I use PyQT5 for a creating a gui app. To run the app on other
systems, where no QT5 and PyQT5 is installed, a bundle is created with
all relevant libraries, so it will start independently. This app
bundle, is called a frozen app. Not only the source code, but all it
dependencies are distributed including python3 itself.
2. In the test-environment pandoc is installed in /usr/local/bin/pandoc
(Mac) or /bin/pandoc (Linux). Which returns the path correctly, at the
terminal (shell), in Python and in the Gui-App Panconvert.
3. I am aware of the limitations of which. There is a fallback to
manually insert the path. So the app will function anyway. And i want
to avoid to search the whole filesystem. This takes minutes on my test
machines, so this is no option.
4. I suppose that something is different from executing the code in the
frozen state. The app e.g. on Mac is not started from a python shell or
a comand shell. But even on linux, when started from a shell it does
not work.
5. I will try the hint with dev.null and the p.check_returncode()
@Wolfgang
1. The function should be executed only, if the path is unknown. If the
user enters the path manually in the settings and pandoc exists, the
function should not be executed to save computation time.
2. Only if the manually entered path is not correct or empty the
function should be executed, hence 'if not os.path.isfile(path_pandoc)'
3. The function fills in the path automatically if which returns a
value. This works in the source code
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