I am using Activestate Perl on Windows, and the Archive::Zip module (1.26)..

the zip file creation is

zip->new() create the object
zip->addfile(), add files to in memory object, repeat as many times a required
zip->writetoNamedFile(filename); write the in memory object to disk in one operation..

someplace in the last function, we encounter a 'read' error. fh->read() fails..(lib.rchive/Zip/newFileMeber.pm/_readRawChunk())

There is an error handler in the zip module package, so we know which file is causing the problem. (5 of them)..

turns out these files are open for write in another process.. so the error is understandable.. BUT.. if we drop to a commandline, we can COPY the file that we got the read error on without difficulty..

SO.. questions..
1. is there some open mode set incorrectly in the zip module Zip.pm/newFileMember.pm which could be corrected to avoid this read problem.
I don't see any 'cross process sharing mode flags' on the open like I see on a C runtime sopen() api.
2. why does the COPY command work?
3. I have been unable to reproduce this with a perl script as the writing process..

this 'file' happens to be a logfile for a long running subsystem component. so it might be 'in use' for months.

we coded up a 'workaround' but can't explain why it works.. 
use File::Copy
copy(badfile,tempfile);
zip->addfile(tempfile);
unlink(tempfile);

[download]

but why does the copy function work?

Sam

In reply to archive::zip create, file read error by sdetweil

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