buildZipArchive

Dear developers.

I am trying to generate a zip file on server and store it in archtype file field.

<dtml-call "setObjProperty('zip_file',exportfile,lang)">

I followed this article (http://www.zms-publishing.com/dokumentation/magic/zip_archive_erstellen/index_ger.html)
but unfortunately it does not work for me:

I can see on server the temp dir and in it the file to be zipped and the py-script returns exportfile
but i dont get it stored in zms file field.

btw ... doing the same with an image works
<dtml-call "setObjProperty('zip_file',myImage,lang)">

setObjProperty is called within onChangeObjEvent Methode

can anybody help?


kind regards,  
Thorsten Weber