[delphizip] Re: zip file corrupted.
- From: RPeters <rpeters@xxxxxxxxxxxxx>
- To: delphizip@xxxxxxxxxxxxx
- Date: Thu, 02 Apr 2009 18:15:46 +1100
Edwin Yip wrote:
> Hi All,
> One of the users reported a zip file corruption error, he did not save the
> error message. The zip file is located at a network drive.
>
> I did not use the AddSafe option, do you think adding that option will solve
> the problem? Can anybody list the possible causes of a zip corruption?
>
> Any comments will be appreciated.
>
>
Of course it depends upon what it was doing at the time.
1. Upon opening a zip (list, extract or preparing to add) it commonly is
1a. zip was built in a way ZipMaster could not understand.
1b. previous add/edit zip failed.
1c. the zip has been corrupted in storage/transfer
(1d.trapped by AntiVirus).
2. After Add/Edit (AddSafe helps with Adding extra files)
2a. operation cancelled.
2b. write fails.
2c. operation fails for some other reason.
I would be very wary of building, or adding to, a zip with the
destination on a network drive but AddSafe helps by building it locally
(assuming the tempDir is not set on a Network drive) then copying it
across the network.
Building a zip requires bidirectional seeking and random writes which
also makes doing it across a network is at best slow.
Russell Peters
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