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ZIPping with Windows Shell
... in Dyalog APL
Suddenly I came in need of zipping files. And what more obvious solution than to use the zip-facilities already present in Windows? In essence it can be accomplished in a 3 (+1 if you don't already have a zip file) step process as follows.
If need be first create an empty zip file, basically a file with these 22 byte values: 80 75 5 6 0 ... 0:
tn←zip_file_name ⎕NCREATE 0
(22↑80 75 5 6)⎕NAPPEND tn 83
⎕NUNTIE tn
Once the zip file is present, create an instance of the Shell COM...
'SHAPP'⎕WC'OLEClient' 'Shell.Application'
... get a handle to the files, here a folder and the zip archive, calling the NameSpace method...
ADD←SHAPP.NameSpace⊂add_folder_name
FILES←ADD.Items
ZIP←SHAPP.NameSpace⊂zip_file_name
... and finally have all files in that folder copied to the ZIP archive,
ZIP.CopyHere FILES(4+16)
where 4 means "don't display a progress dialog box", and 16 "respond with 'Yes to All' for any dialog box that is displayed".
Note that FILES can be a FolderItems object (as here), a FolderItem object, or a string that represents a file name.