[delphizip] Re: OnSetExtraField
- From: Gerard <gslurink@xxxxxx>
- To: delphizip@xxxxxxxxxxxxx
- Date: Thu, 21 Nov 2002 15:58:06 +0200
Hi Rusell,
I am not sure what 'format it' exactly means but I guess it would be good
idea to prevent that an event handler (user) can screw up the file, so that
for example the eventhandler can write an array of byte or a string in the
payload of the extra field and the rest is handled behind the scene. If I
would ever use this field for a rename as I once proposed, I would write
special procedure for this, which handles name and extra field and their
sizes at the same time.
Same prevention with the OnNewName event: do not allow writing names that
cannot be parsed (like \folder\file.pas )
I once read from some Delphi pro, and I find this a very good principle: it
should be possible to set a property of a component to any value that it
accepts, without giving trouble. There should be no hidden rules or
required order. I know this it not so easy as it sound though ;-)
Cheers,
Gerard.
At 07:46 21.11.2002 +1100, you wrote:
>When implementing handling to set the 'extra field' do I format it (as per
>recomendations) or do I leave it up to the person using it to format the data?
>It is essential that the extra field data be correctly formatted and
>identified or the zipfile cannot be opened (reliably) by other programs.
>
>Russell Peters
>http://www.users.bigpond.com/russellpeters/delphizip.html
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