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Perl-Users Digest, Issue: 2280 Volume: 11

daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Tue Mar 17 16:09:44 2009

Date: Tue, 17 Mar 2009 13:09:07 -0700 (PDT)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)

Perl-Users Digest           Tue, 17 Mar 2009     Volume: 11 Number: 2280

Today's topics:
    Re: FAQ posts <darkon.tdo@gmail.com>
    Re: FAQ posts <darkon.tdo@gmail.com>
    Re: How to set the message displayed when a Perl Script <hjp-usenet2@hjp.at>
    Re: Most efficient way to do set-comparison <schaitan@gmail.com>
    Re: perl/postscript csv->labels HERE-PROGRAM (Tim McDaniel)
    Re: perl/postscript csv->labels HERE-PROGRAM <hjp-usenet2@hjp.at>
    Re: perl/postscript csv->labels HERE-PROGRAM <1usa@llenroc.ude.invalid>
        Posting Guidelines for comp.lang.perl.misc ($Revision:  tadmc@seesig.invalid
        Test jpeg files for corruption under win32? <hitodenashi@alexandria.cc>
    Re: Using Imager module, resize before write? <jwcarlton@gmail.com>
        Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)

----------------------------------------------------------------------

Date: Tue, 17 Mar 2009 14:11:20 -0400
From: "darkon" <darkon.tdo@gmail.com>
Subject: Re: FAQ posts
Message-Id: <AeqdnQnv6oxUeiLUnZ2dnUVZ_u-dnZ2d@supernews.com>


"Ben Morrow" <ben@morrow.me.uk> wrote in message 
news:au2396-eno2.ln1@osiris.mauzo.dyndns.org...
>
> Quoth "darkon" <darkon.tdo@gmail.com>:
>>
>> If I understand the grep correctly, @files ends up with only one filename 
>> in
>> it: the oldest file.  But later, in select_faq(), you say
>>
>>     my @files = get_files( $config );
>>     my $file = $files[rand @files];
>>
>> I see no reason for the call to rand() unless it's just left over from an
>> earlier version.  Maybe I'm missing something.
>
> Yes: some of the files have the *same* -A time. In the case that there
> are several oldest files that are equally old, one is picked at random.

Oh, duh.  <smacks self>  I should have seen that.



------------------------------

Date: Tue, 17 Mar 2009 14:12:26 -0400
From: "darkon" <darkon.tdo@gmail.com>
Subject: Re: FAQ posts
Message-Id: <UKSdnalgTfCWdSLUnZ2dnUVZ_uKWnZ2d@supernews.com>


"Randal L. Schwartz" <merlyn@stonehenge.com> wrote in message 
news:863addvylv.fsf@blue.stonehenge.com...
>>>>>> "darkon" == darkon  <darkon.tdo@gmail.com> writes:
>
> darkon>    my $time  = 0;
> darkon>    my @files =
> darkon>        map  { $_->[0] }
> darkon>        grep { $time ||= $_->[1]; $_->[1] == $time }
> darkon>        sort { $b->[1] <=> $a->[1] }
> darkon>        map  { [ $_, -A $_ ] }
> darkon>        glob( File::Spec->catfile( $config->FAQ_DIR, 
> "perlfaq*.txt" ) );
>
> darkon> If I understand the grep correctly, @files ends up with only one 
> filename in
> darkon> it: the oldest file.
>
> Nope.  It ends up with all files that have the same mtime as the
> oldest file.

Yeah, I see that now.  Can I plead that it was late in the day and I was 
tired?  :-)



------------------------------

Date: Tue, 17 Mar 2009 17:46:21 +0100
From: "Peter J. Holzer" <hjp-usenet2@hjp.at>
Subject: Re: How to set the message displayed when a Perl Script fails compilation?
Message-Id: <slrngrvkuu.5ts.hjp-usenet2@hrunkner.hjp.at>

On 2009-03-17 02:11, Xho Jingleheimerschmidt <xhoster@gmail.com> wrote:
> Gunnar Hjalmarsson wrote:
>> Krishna Chaitanya wrote:
>>> Hi, I don't know if this is going to help you....but read up on
>>> fatalsToBrowser ...
>> 
>> That feature
>> 
>> 1) might reveal sensitive information,
>
> What kind?  The only sensitive information I've seen it reveal is "Hey, 
> this programmer is clueless."

Authentication credentials.
Hash seeds (I think the recent typo3 exploit used this).
Non-public file names.
 ...

Often you want this kind of information in an error log so that you can
reproduce the error. So you might include them in a die(). But revealing
them to the user would be a bad idea.

	hp


------------------------------

Date: Tue, 17 Mar 2009 04:09:40 -0700 (PDT)
From: Krishna Chaitanya <schaitan@gmail.com>
Subject: Re: Most efficient way to do set-comparison
Message-Id: <f81315af-f15e-4d0f-92cb-06c20a684cb6@p36g2000prp.googlegroups.com>

> So as a general rule, you want to set up methods both public and private, that change state,
> during runtime.

The mention of private methods is interesting...esp. in Perl. Since
there are no C++-like keywords (private, et al), it's a lot more work
to ensure privacy in Perl for OO? Like using file-level scoping,
closures, etc? Would love to know how this is done as an example, so
that I make up my own ways of designing classes in future. Any good
CPAN modules you know that have private method implementation?

One of my biggest problems is how to achieve true-blue data
encapsulation in Perl.....much like in C++/Java. Am looking for the
strong OO-like encapsulation with the beauty and terseness of Perl.
What an amazing combo that would be!

> Most of the parameters are consumed as local to the method,
> however with complex data, processing sometimes permutes to sub calls to private helper methods
> and area's of $self are sometimes used for scratch instead of passing around the data again.

Yep, in 1 of the .pm I am writing, I've resorted to create more $self
keys "internally" to store some of the results of my calculations
using user input, but which I want the object to "remember" and not be
evaluated again and again (the user doesn't know about these keys as
they are not documented). So, the first-time call to this method would
calculate something, create a key on $self for it and store it. I know
this won't change with repeated calls to this function, so the
subsequent calls will just examine if this key is defined or not and
return the value if defined.

> If its a big item, you may want
> to build a reporting truss within it that can be called by methods. There may be different levels
> of errors from fatal to misdemeaner. A good logging system is always recommended.
>
What is a reporting truss, pls? I've searched but didn't find much on
it. Also, about this truss and good logging system, again, could you
pls. site examples of good CPAN modules that already do all this? I am
prepared to read every line of them to understand these concepts. Pls.
don't mind if I ask for examples, but they really drive home all of
you guys' points...

Thanks for all of your time, help...means much.


------------------------------

Date: Tue, 17 Mar 2009 16:16:17 +0000 (UTC)
From: tmcd@panix.com (Tim McDaniel)
Subject: Re: perl/postscript csv->labels HERE-PROGRAM
Message-Id: <gpoich$ft1$1@reader1.panix.com>

In article <slrngruf30.5s6.nospam-abuse@chorin.math.berkeley.edu>,
Ilya Zakharevich  <nospam-abuse@ilyaz.org> wrote:
>On 2009-03-17, Tad J McClellan <tadmc@seesig.invalid> wrote:
>>> #!/usr/bin/perl
>>
>> Ask for all the help you can get:
>>
>>     use strict;
>>     use warnings;
>
>Or, better, add -w ot the #!-line...
>
>>> if ($#ARGV == -1) { $ARGV[0] = "addr.csv"; } #default argument
>
>>     $ARGV[0] = "addr.csv" unless defined $ARGV[0]; # default argument
>
>I would write
>
>      @ARGV = "addr.csv"    unless @ARGV;

I would write

    @ARGV = ('addr.csv') if @ARGV == 0;

The parens don't actually cause a list context, but they're visually
reminiscent.  In C, where {...} was allowed but not required around
one statement, I used {...} anyway.

I use '...' unless I need variable interpolation.

-- 
Tim McDaniel, tmcd@panix.com


------------------------------

Date: Tue, 17 Mar 2009 17:47:39 +0100
From: "Peter J. Holzer" <hjp-usenet2@hjp.at>
Subject: Re: perl/postscript csv->labels HERE-PROGRAM
Message-Id: <slrngrvl1c.5ts.hjp-usenet2@hrunkner.hjp.at>

On 2009-03-17 06:00, Ilya Zakharevich <nospam-abuse@ilyaz.org> wrote:
> On 2009-03-17, Tad J McClellan <tadmc@seesig.invalid> wrote:
>>> #!/usr/bin/perl
>>
>> Ask for all the help you can get:
>>
>>     use strict;
>>     use warnings;
>
> Or, better, add -w ot the #!-line...

Ok, I'll bite: How is -w better than "use warnings"?

	hp


------------------------------

Date: Tue, 17 Mar 2009 16:59:03 GMT
From: "A. Sinan Unur" <1usa@llenroc.ude.invalid>
Subject: Re: perl/postscript csv->labels HERE-PROGRAM
Message-Id: <Xns9BD184139A4A3asu1cornelledu@127.0.0.1>

tmcd@panix.com (Tim McDaniel) wrote in
news:gpoich$ft1$1@reader1.panix.com: 

> In article <slrngruf30.5s6.nospam-abuse@chorin.math.berkeley.edu>,
> Ilya Zakharevich  <nospam-abuse@ilyaz.org> wrote:
>>On 2009-03-17, Tad J McClellan <tadmc@seesig.invalid> wrote:
>>>> #!/usr/bin/perl
>>>
>>> Ask for all the help you can get:
>>>
>>>     use strict;
>>>     use warnings;
>>
>>Or, better, add -w ot the #!-line...
>>
>>>> if ($#ARGV == -1) { $ARGV[0] = "addr.csv"; } #default argument
>>
>>>     $ARGV[0] = "addr.csv" unless defined $ARGV[0]; # default
>>>     argument 
>>
>>I would write
>>
>>      @ARGV = "addr.csv"    unless @ARGV;
> 
> I would write
> 
>     @ARGV = ('addr.csv') if @ARGV == 0;


I would write:

@ARGV = qw( addr.csv ) unless @ARGV;

Sinan

-- 
A. Sinan Unur <1usa@llenroc.ude.invalid>
(remove .invalid and reverse each component for email address)

comp.lang.perl.misc guidelines on the WWW:
http://www.rehabitation.com/clpmisc/


------------------------------

Date: Tue, 17 Mar 2009 07:10:13 GMT
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.9 $)
Message-Id: <p1Ivl.2186$im1.882@nlpi061.nbdc.sbc.com>

Outline
   Before posting to comp.lang.perl.misc
      Must
       - Check the Perl Frequently Asked Questions (FAQ)
       - Check the other standard Perl docs (*.pod)
      Really Really Should
       - Lurk for a while before posting
       - Search a Usenet archive
      If You Like
       - Check Other Resources
   Posting to comp.lang.perl.misc
      Is there a better place to ask your question?
       - Question should be about Perl, not about the application area
      How to participate (post) in the clpmisc community
       - Carefully choose the contents of your Subject header
       - Use an effective followup style
       - Speak Perl rather than English, when possible
       - Ask perl to help you
       - Do not re-type Perl code
       - Provide enough information
       - Do not provide too much information
       - Do not post binaries, HTML, or MIME
      Social faux pas to avoid
       - Asking a Frequently Asked Question
       - Asking a question easily answered by a cursory doc search
       - Asking for emailed answers
       - Beware of saying "doesn't work"
       - Sending a "stealth" Cc copy
      Be extra cautious when you get upset
       - Count to ten before composing a followup when you are upset
       - Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------

Posting Guidelines for comp.lang.perl.misc ($Revision: 1.9 $)
    This newsgroup, commonly called clpmisc, is a technical newsgroup
    intended to be used for discussion of Perl related issues (except job
    postings), whether it be comments or questions.

    As you would expect, clpmisc discussions are usually very technical in
    nature and there are conventions for conduct in technical newsgroups
    going somewhat beyond those in non-technical newsgroups.

    The article at:

        http://www.catb.org/~esr/faqs/smart-questions.html

    describes how to get answers from technical people in general.

    This article describes things that you should, and should not, do to
    increase your chances of getting an answer to your Perl question. It is
    available in POD, HTML and plain text formats at:

     http://www.rehabitation.com/clpmisc.shtml

    For more information about netiquette in general, see the "Netiquette
    Guidelines" at:

     http://andrew2.andrew.cmu.edu/rfc/rfc1855.html

    A note to newsgroup "regulars":

       Do not use these guidelines as a "license to flame" or other
       meanness. It is possible that a poster is unaware of things
       discussed here.  Give them the benefit of the doubt, and just
       help them learn how to post, rather than assume that they do 
       know and are being the "bad kind" of Lazy.

    A note about technical terms used here:

       In this document, we use words like "must" and "should" as
       they're used in technical conversation (such as you will
       encounter in this newsgroup). When we say that you *must* do
       something, we mean that if you don't do that something, then
       it's unlikely that you will benefit much from this group.
       We're not bossing you around; we're making the point without
       lots of words.

    Do *NOT* send email to the maintainer of these guidelines. It will be
    discarded unread. The guidelines belong to the newsgroup so all
    discussion should appear in the newsgroup. I am just the secretary that
    writes down the consensus of the group.

Before posting to comp.lang.perl.misc
  Must
    This section describes things that you *must* do before posting to
    clpmisc, in order to maximize your chances of getting meaningful replies
    to your inquiry and to avoid getting flamed for being lazy and trying to
    have others do your work.

    The perl distribution includes documentation that is copied to your hard
    drive when you install perl. Also installed is a program for looking
    things up in that (and other) documentation named 'perldoc'.

    You should either find out where the docs got installed on your system,
    or use perldoc to find them for you. Type "perldoc perldoc" to learn how
    to use perldoc itself. Type "perldoc perl" to start reading Perl's
    standard documentation.

    Check the Perl Frequently Asked Questions (FAQ)
        Checking the FAQ before posting is required in Big 8 newsgroups in
        general, there is nothing clpmisc-specific about this requirement.
        You are expected to do this in nearly all newsgroups.

        You can use the "-q" switch with perldoc to do a word search of the
        questions in the Perl FAQs.

    Check the other standard Perl docs (*.pod)
        The perl distribution comes with much more documentation than is
        available for most other newsgroups, so in clpmisc you should also
        see if you can find an answer in the other (non-FAQ) standard docs
        before posting.

    It is *not* required, or even expected, that you actually *read* all of
    Perl's standard docs, only that you spend a few minutes searching them
    before posting.

    Try doing a word-search in the standard docs for some words/phrases
    taken from your problem statement or from your very carefully worded
    "Subject:" header.

  Really Really Should
    This section describes things that you *really should* do before posting
    to clpmisc.

    Lurk for a while before posting
        This is very important and expected in all newsgroups. Lurking means
        to monitor a newsgroup for a period to become familiar with local
        customs. Each newsgroup has specific customs and rituals. Knowing
        these before you participate will help avoid embarrassing social
        situations. Consider yourself to be a foreigner at first!

    Search a Usenet archive
        There are tens of thousands of Perl programmers. It is very likely
        that your question has already been asked (and answered). See if you
        can find where it has already been answered.

        One such searchable archive is:

         http://groups.google.com/advanced_search

  If You Like
    This section describes things that you *can* do before posting to
    clpmisc.

    Check Other Resources
        You may want to check in books or on web sites to see if you can
        find the answer to your question.

        But you need to consider the source of such information: there are a
        lot of very poor Perl books and web sites, and several good ones
        too, of course.

Posting to comp.lang.perl.misc
    There can be 200 messages in clpmisc in a single day. Nobody is going to
    read every article. They must decide somehow which articles they are
    going to read, and which they will skip.

    Your post is in competition with 199 other posts. You need to "win"
    before a person who can help you will even read your question.

    These sections describe how you can help keep your article from being
    one of the "skipped" ones.

  Is there a better place to ask your question?
    Question should be about Perl, not about the application area
        It can be difficult to separate out where your problem really is,
        but you should make a conscious effort to post to the most
        applicable newsgroup. That is, after all, where you are the most
        likely to find the people who know how to answer your question.

        Being able to "partition" a problem is an essential skill for
        effectively troubleshooting programming problems. If you don't get
        that right, you end up looking for answers in the wrong places.

        It should be understood that you may not know that the root of your
        problem is not Perl-related (the two most frequent ones are CGI and
        Operating System related), so off-topic postings will happen from
        time to time. Be gracious when someone helps you find a better place
        to ask your question by pointing you to a more applicable newsgroup.

  How to participate (post) in the clpmisc community
    Carefully choose the contents of your Subject header
        You have 40 precious characters of Subject to win out and be one of
        the posts that gets read. Don't waste them. Take care while
        composing them, they are the key that opens the door to getting an
        answer.

        Spend them indicating what aspect of Perl others will find if they
        should decide to read your article.

        Do not spend them indicating "experience level" (guru, newbie...).

        Do not spend them pleading (please read, urgent, help!...).

        Do not spend them on non-Subjects (Perl question, one-word
        Subject...)

        For more information on choosing a Subject see "Choosing Good
        Subject Lines":

         http://www.cpan.org/authors/id/D/DM/DMR/subjects.post

        Part of the beauty of newsgroup dynamics, is that you can contribute
        to the community with your very first post! If your choice of
        Subject leads a fellow Perler to find the thread you are starting,
        then even asking a question helps us all.

    Use an effective followup style
        When composing a followup, quote only enough text to establish the
        context for the comments that you will add. Always indicate who
        wrote the quoted material. Never quote an entire article. Never
        quote a .signature (unless that is what you are commenting on).

        Intersperse your comments *following* each section of quoted text to
        which they relate. Unappreciated followup styles are referred to as
        "top-posting", "Jeopardy" (because the answer comes before the
        question), or "TOFU" (Text Over, Fullquote Under).

        Reversing the chronology of the dialog makes it much harder to
        understand (some folks won't even read it if written in that style).
        For more information on quoting style, see:

         http://web.presby.edu/~nnqadmin/nnq/nquote.html

    Speak Perl rather than English, when possible
        Perl is much more precise than natural language. Saying it in Perl
        instead will avoid misunderstanding your question or problem.

        Do not say: I have variable with "foo\tbar" in it.

        Instead say: I have $var = "foo\tbar", or I have $var = 'foo\tbar',
        or I have $var = <DATA> (and show the data line).

    Ask perl to help you
        You can ask perl itself to help you find common programming mistakes
        by doing two things: enable warnings (perldoc warnings) and enable
        "strict"ures (perldoc strict).

        You should not bother the hundreds/thousands of readers of the
        newsgroup without first seeing if a machine can help you find your
        problem. It is demeaning to be asked to do the work of a machine. It
        will annoy the readers of your article.

        You can look up any of the messages that perl might issue to find
        out what the message means and how to resolve the potential mistake
        (perldoc perldiag). If you would like perl to look them up for you,
        you can put "use diagnostics;" near the top of your program.

    Do not re-type Perl code
        Use copy/paste or your editor's "import" function rather than
        attempting to type in your code. If you make a typo you will get
        followups about your typos instead of about the question you are
        trying to get answered.

    Provide enough information
        If you do the things in this item, you will have an Extremely Good
        chance of getting people to try and help you with your problem!
        These features are a really big bonus toward your question winning
        out over all of the other posts that you are competing with.

        First make a short (less than 20-30 lines) and *complete* program
        that illustrates the problem you are having. People should be able
        to run your program by copy/pasting the code from your article. (You
        will find that doing this step very often reveals your problem
        directly. Leading to an answer much more quickly and reliably than
        posting to Usenet.)

        Describe *precisely* the input to your program. Also provide example
        input data for your program. If you need to show file input, use the
        __DATA__ token (perldata.pod) to provide the file contents inside of
        your Perl program.

        Show the output (including the verbatim text of any messages) of
        your program.

        Describe how you want the output to be different from what you are
        getting.

        If you have no idea at all of how to code up your situation, be sure
        to at least describe the 2 things that you *do* know: input and
        desired output.

    Do not provide too much information
        Do not just post your entire program for debugging. Most especially
        do not post someone *else's* entire program.

    Do not post binaries, HTML, or MIME
        clpmisc is a text only newsgroup. If you have images or binaries
        that explain your question, put them in a publically accessible
        place (like a Web server) and provide a pointer to that location. If
        you include code, cut and paste it directly in the message body.
        Don't attach anything to the message. Don't post vcards or HTML.
        Many people (and even some Usenet servers) will automatically filter
        out such messages. Many people will not be able to easily read your
        post. Plain text is something everyone can read.

  Social faux pas to avoid
    The first two below are symptoms of lots of FAQ asking here in clpmisc.
    It happens so often that folks will assume that it is happening yet
    again. If you have looked but not found, or found but didn't understand
    the docs, say so in your article.

    Asking a Frequently Asked Question
        It should be understood that you may have missed the applicable FAQ
        when you checked, which is not a big deal. But if the Frequently
        Asked Question is worded similar to your question, folks will assume
        that you did not look at all. Don't become indignant at pointers to
        the FAQ, particularly if it solves your problem.

    Asking a question easily answered by a cursory doc search
        If folks think you have not even tried the obvious step of reading
        the docs applicable to your problem, they are likely to become
        annoyed.

        If you are flamed for not checking when you *did* check, then just
        shrug it off (and take the answer that you got).

    Asking for emailed answers
        Emailed answers benefit one person. Posted answers benefit the
        entire community. If folks can take the time to answer your
        question, then you can take the time to go get the answer in the
        same place where you asked the question.

        It is OK to ask for a *copy* of the answer to be emailed, but many
        will ignore such requests anyway. If you munge your address, you
        should never expect (or ask) to get email in response to a Usenet
        post.

        Ask the question here, get the answer here (maybe).

    Beware of saying "doesn't work"
        This is a "red flag" phrase. If you find yourself writing that,
        pause and see if you can't describe what is not working without
        saying "doesn't work". That is, describe how it is not what you
        want.

    Sending a "stealth" Cc copy
        A "stealth Cc" is when you both email and post a reply without
        indicating *in the body* that you are doing so.

  Be extra cautious when you get upset
    Count to ten before composing a followup when you are upset
        This is recommended in all Usenet newsgroups. Here in clpmisc, most
        flaming sub-threads are not about any feature of Perl at all! They
        are most often for what was seen as a breach of netiquette. If you
        have lurked for a bit, then you will know what is expected and won't
        make such posts in the first place.

        But if you get upset, wait a while before writing your followup. I
        recommend waiting at least 30 minutes.

    Count to ten after composing and before posting when you are upset
        After you have written your followup, wait *another* 30 minutes
        before committing yourself by posting it. You cannot take it back
        once it has been said.

AUTHOR
    Tad McClellan and many others on the comp.lang.perl.misc newsgroup.

-- 
Tad McClellan
email: perl -le "print scalar reverse qq/moc.noitatibaher\100cmdat/"


------------------------------

Date: Tue, 17 Mar 2009 18:58:34 +0100
From: Rodion <hitodenashi@alexandria.cc>
Subject: Test jpeg files for corruption under win32?
Message-Id: <MPG.242a03359a3dafb59896c4@news.metronet.hr>

Unfortunatly there is no Image::TestJPG or similar modules compiled for windows. 
Sure, I could find a cli prog and do a system call, but would like to keep it a pure Perl solution.
Any ideas?

-- 
 
 Professor: Now, be careful, Fry. And if you kill anyone, make sure
 to eat their heart to gain their courage. Their rich tasty courage.




------------------------------

Date: Tue, 17 Mar 2009 02:54:45 -0700 (PDT)
From: Jason Carlton <jwcarlton@gmail.com>
Subject: Re: Using Imager module, resize before write?
Message-Id: <a8d177bf-7c0f-4e27-a68a-27930f013a54@v19g2000yqn.googlegroups.com>

On Mar 16, 4:32=A0am, "Peter J. Holzer" <hjp-usen...@hjp.at> wrote:
> On 2009-03-16 09:12, Jason Carlton <jwcarl...@gmail.com> wrote:
>
>
>
>
>
> > I'm allowing my site visitor to upload an image. I then resize it to
> > make it fit the dimensions.
>
> > Currently, I'm having to write the image to the server, then read it,
> > resize it, and rewrite it. Like this:
>
> > $picture =3D upload('picture');
>
> > open PIC, ">$basepath/$newpicture";
> > =A0 binmode (PIC);
> > =A0 while ($bytes =3D read($picture,$data,16384)) {
> > =A0 =A0 $length_info +=3D $bytes;
> > =A0 =A0 print PIC $data;
> > =A0 }
> > close PIC;
>
> > # Resize picture
> > my $image =3D Imager->new;
> > $image->read(file =3D> "$basepath/$newpicture");
> > $resize_pic =3D $image->scale(xpixels=3D>400, qtype =3D> 'mixing');
> > $resize_pic->write(file =3D> "$basepath/$newpicture");
>
> > It seems redundant to write it twice,
>
> You don't have to write the picture to a file. $image->read can read
> from a file handle. So
>
> =A0 =A0 $picture =3D upload('picture');
> =A0 =A0 my $image =3D Imager->new;
> =A0 =A0 $image->read(fh =3D> $picture)
>
> should work.
>
> > and it's a waste of bandwidth when someone uploads a 3MB picture just
> > to have it resized to 20kb, but I haven't been able to get it to just
> > read the file to resize before writing it.
>
> You can't resize a picture you don't have, so there isn't anything you
> can do about it, except ask the user (nicely) to resize the pictures
> before uploading them (theoretically it could be done with javascript in
> the browser but I don't think JS has access to the contents of an
> uploaded file).
>
> =A0 =A0 =A0 =A0 hp- Hide quoted text -
>
> - Show quoted text -


Thanks, I sort of figured that would be the answer. I'm not entirely
sure how the "upload" function works, though, so I was hoping that
$picture =3D upload('picture') would cache the image or something,
letting me manipulate $picture without having uploaded to the server.

- Jason


------------------------------

Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin) 
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>


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