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Re: Unzipping files using Archive::Zip

by bikeNomad (Priest)
on Aug 14, 2001 at 05:19 UTC ( #104653=note: print w/replies, xml ) Need Help??

in reply to Unzipping files using Archive::Zip

What part of the Archive::Zip docs did you find confusing? I'm always looking to improve them.

Assuming that your uploaded .zip file is sitting in a real file, it's pretty easy to use Archive::Zip. You do have to decide how you'll map directory names (since I'm assuming you don't want to clobber existing files with the same name on the server); you could, perhaps, just delete the directory path and stick the unzipped files somewhere. You might also want to provide some kind of semaphoring or other protection, but that isn't Archive::Zip's job, of course.

Just extracting a zip file is easy. This quick example extracts a zip file, throwing away the directories and directory names (note that there is no error checking here):

use Archive::Zip; my $zipname = ''; my $destinationDirectory = '/some/where'; my $zip = Archive::Zip->new($zipname); foreach my $member ($zip->members) { next if $member->isDirectory; (my $extractName = $member->fileName) =~ s{.*/}{}; $member->extractToFileNamed( "$destinationDirectory/$extractName"); }

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Re^2: Unzipping files using Archive::Zip
by Anonymous Monk on Mar 18, 2005 at 16:23 UTC
    Thank you for your post. It was very helpful. I'd like to reply to your question since the original poster did not. It is a couple of years later, but I think the situation is the same.

    Speaking for myself, I would say that the documentation is difficult because I did not find out how to do what I wanted within 1 minute, without reading any documentation.

    Let me explain: when I have a simple, standard problem, I begin by looking at the SYNOPSIS. If I don't find a match to my problem there, I start scanning the document, looking further on any interesting method names. I rarely read documentation from the start to the finish, unless I'm trying to do something obscure and I'm not sure how to go about it.

    In this case, I received a single zipped file from someone and I wanted to unzip it. After 15 minutes of looking through the documentation, I still didn't have my answer, so I came here, did a search, and found a solution. My resulting code is probably not as elegant as it could be, but it is functional:

    sub unzip { my ($archive, $want, $dir) = shift; my $zip = Archive::Zip->new($dir.$archive); foreach my $file ($zip->members) { next unless ($file->fileName eq $want); $file->extractToFileNamed($dir.$want); } croak "There was a problem extracting $want from $archive" unless +(-e $dir.$want); return 1; }

    So your solution here was clear and instantly solved my problem, whereas the documentation wasn't and didn't.

    My suggestion for improving the documentation would be to keep in mind that people are lazy and use cookbook style examples, like the one you gave here.

    If your synopsis consisted of two examples, one for creating an archive and one for extracting one (like the above example, but with error handling*), you'd probably address 90% of what people want to do with the module. For the curious, or for those whose problems are complicated, there's the whole wealth of your detailed documentation.

    You might also add some whitespace between examples in the synopsis and label them, for instance '# Unzip an archive' or '# Zip a directory'.

    * I find the error handling a bit unusual, with its comparisions instead of the more usual my $foo = dosomething() or croak "Couldn't dosomething: ".$Package::Errstr; or my $foo = $do->something() or croak "Couldn't something: ".$do->errstr();. This is why in my example I opted to do my own error checking, which is clearly inferior as it won't tell me why the operation failed.

      How do i create my own post here ? I dont find any way to do that.

        The post you're replying to is six years old. Perhaps you should post your own question, clearly in SoPW.

Re: Re: Unzipping files using Archive::Zip
by wanadlan (Initiate) on Jan 28, 2003 at 21:21 UTC
    I had tried your simple zip program. Your zip program is unzip all file in zip file. But how can I unzip certain fail in zip file?
      With the above example, you could see if the $member->fileName matches one of the file names you are interested in.

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