zlib Python module missing on Windows? (was: Import of MXL (compressed XML) ends with error message missing "zlib module")

[Urs Liska]

CCing back to the list (please always reply-to-all)

Am 13.01.19 um 16:35 schrieb Sam:
> Added the musicxml-file-extension-wish to the Frescobaldi issue tracker.
Thanks, I've seen it. And I must say that I read your initial message 
during a rehearsal, and when I got home I would probably have forgotten 
about the issue. So creating an explicit issue was a good idea.

> "I can't really say anything about this." ...means MXL import works 
> for you? Or that it has nothing directly to do with LilyPond? The 
> latter is probably true, since something seems to be missing from the 
> integrated Python bundle, but this bundle is part of the LilyPond 
> installation on Windows.

That means I didn't know anything about this issue.

On my Linux computer I don't see your problem.

a) A self-compiled LilyPond imports the .mxl file without errors or 
warnings (however, I didn't check the *results*).

b) Running LilyPond 2.19.82 from the binary download correctly 
uncompressed the file but failed later:

Starting musicxml2ly...

musicxml2ly: Reading MusicXML from 
/home/uliska/Aktuell/tests/lilypond/xml/Nh_Reichard_Abends_male.mxl ...

musicxml2ly: Input file 
/home/uliska/Aktuell/tests/lilypond/xml/Nh_Reichard_Abends_male.mxl is 
compressed, extracting raw MusicXML data

musicxml2ly: Converting to LilyPond expressions...

musicxml2ly: Converting to LilyPond expressions...

musicxml2ly: Converting to LilyPond expressions...

musicxml2ly: Converting to LilyPond expressions...

musicxml2ly: Output to 
`/tmp/frescobaldi-742kjseh/tmphr5kz8kp/Nh_Reichard_Abends_male.ly'

Traceback (most recent call last):

File "/home/uliska/lilypond/usr/bin/musicxml2ly", line 3277, in ?

main()

File "/home/uliska/lilypond/usr/bin/musicxml2ly", line 3271, in main

voices = convert(filename, options)

File "/home/uliska/lilypond/usr/bin/musicxml2ly", line 3183, in convert

score_information.print_ly(printer)

File 
"/home/uliska/lilypond/usr/share/lilypond/current/python/musicexp.py", 
line 855, in print_ly

self.format_header_strings(k, v, printer)

File 
"/home/uliska/lilypond/usr/share/lilypond/current/python/musicexp.py", 
line 848, in format_header_strings

printer.newline()

File 
"/home/uliska/lilypond/usr/share/lilypond/current/python/musicexp.py", 
line 123, in newline

self._file.write (self._line + '\n')

File "/home/uliska/lilypond/usr/lib/python2.4/codecs.py", line 501, in write

return self.writer.write(data)

File "/home/uliska/lilypond/usr/lib/python2.4/codecs.py", line 178, in write

data, consumed = self.encode(object, self.errors)

UnicodeDecodeError: 'utf8' codec can't decode bytes in position 30-35: 
unsupported Unicode code range

This is due to the (known) problem that the ancient bundled Python 2.4 
has problems with the UTF-8 encoding used today.

This indicates that a module is missing from the Python bundled with the 
*Windows* installer.

Urs

> Am 13.01.2019 um 14:57 schrieb Urs Liska:
> > Hi Sam,
> >
> > Am 13. Januar 2019 14:26:48 MEZ schrieb Sam <address@hidden>:
> > > Hello Lilypondians,
> > > I tried to import compressed musicxml files (MXL), but no matter which
> > > Lilypond version I am using (not all of them, of course, but 2.19.31/65
> > >
> > > + 82), I always get the error message "De-compression requires the
> > > (missing) zlib module". The attachment contains a MXL file for testing
> > > purposes. According to Lilypond and also Frescobaldi's import dialog an
> > >
> > > MXL import should be possible. As it looks something is missing with
> > > the
> > > bundled Python.
> > I can't really say anything about this.
> >
> > > Greetings
> > > Andreas
> > >
> > > OS is Windows 10 (1809), Lilypond 2.19.31/65/82 (in 3 different
> > > directories) and Frescobaldi 2.20.0 are installed.
> > >
> > > P.S.: since the import via XML works quite well for me (but not in
> > > 2.9.65/82), the MXL problem never bothered me much. Unfortunately
> > > MuseScore has changed the extension from .xml to .musicxml, so you have
> > >
> > > to rename files you want to import all the time. Maybe you could add
> > > the
> > > extension musicxml for the import.
> > This is directed at Frescobaldi and not LilyPond. I can easily add 
> > that, but could you please add that wish on Frescobaldi's GitHub 
> > issue tracker so it doesn't get lost.
> >
> > Thanks
> > Urs