[31864] in Perl-Users-Digest
Perl-Users Digest, Issue: 3127 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Sat Sep 11 06:09:37 2010
Date: Sat, 11 Sep 2010 03:09:11 -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 Sat, 11 Sep 2010 Volume: 11 Number: 3127
Today's topics:
Re: convert byte stream to integers <derykus@gmail.com>
Re: convert byte stream to integers <sreservoir@gmail.com>
Re: convert byte stream to integers <ben@morrow.me.uk>
Re: convert byte stream to integers <jwkrahn@example.com>
Re: convert byte stream to integers <ben@morrow.me.uk>
Re: convert byte stream to integers <sreservoir@gmail.com>
Re: convert byte stream to integers <sreservoir@gmail.com>
Re: FAQ 5.10 How can I use a filehandle indirectly? <brian.d.foy@gmail.com>
Re: Ideal data structure for nested list format? <tuxedo@mailinator.com>
Re: Ideal data structure for nested list format? <tuxedo@mailinator.com>
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@seesig.invalid
tcp server <ron.eggler@gmail.com>
Re: tcp server <glex_no-spam@qwest-spam-no.invalid>
Re: tcp server <m@rtij.nl.invlalid>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Fri, 10 Sep 2010 01:07:44 -0700 (PDT)
From: "C.DeRykus" <derykus@gmail.com>
Subject: Re: convert byte stream to integers
Message-Id: <f035bc94-1ed4-41bd-9c01-250987a89ab3@q40g2000prg.googlegroups.com>
On Sep 9, 12:31=A0pm, "John W. Krahn" <jwkr...@example.com> wrote:
> C.DeRykus wrote:
> > perl -we 'open(F,"./4byte"); $,=3D"\t"; print unpack "I*",$s while read
> > F,$s,16'
>
> You need the -l switch for that to work the same as the OP's
>
> perl -lne'BEGIN{$/=3D\16;$,=3D"\t"}print unpack"I*",$_' ./4byte
>
Neat. Still, neither is safe on Win32
without binmode - both input/output.
perl -lne 'use open IO=3D>":raw"; ..."
--
Charles DeRykus
------------------------------
Date: Fri, 10 Sep 2010 18:13:55 -0400
From: sreservoir <sreservoir@gmail.com>
Subject: Re: convert byte stream to integers
Message-Id: <i6eaj8$cfk$1@news.eternal-september.org>
On 9/10/2010 4:07 AM, C.DeRykus wrote:
> On Sep 9, 12:31 pm, "John W. Krahn"<jwkr...@example.com> wrote:
>> C.DeRykus wrote:
>>> perl -we 'open(F,"./4byte"); $,="\t"; print unpack "I*",$s while read
>>> F,$s,16'
>>
>> You need the -l switch for that to work the same as the OP's
>>
>> perl -lne'BEGIN{$/=\16;$,="\t"}print unpack"I*",$_' ./4byte
>>
>
> Neat. Still, neither is safe on Win32
> without binmode - both input/output.
>
> perl -lne 'use open IO=>":raw"; ..."
no. perl -Mopen=IO,:raw ....
--
"Six by nine. Forty two."
"That's it. That's all there is."
"I always thought something was fundamentally wrong with the universe."
------------------------------
Date: Sat, 11 Sep 2010 01:08:15 +0100
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: convert byte stream to integers
Message-Id: <fstql7-2561.ln1@osiris.mauzo.dyndns.org>
Quoth sreservoir <sreservoir@gmail.com>:
> On 9/10/2010 4:07 AM, C.DeRykus wrote:
> > On Sep 9, 12:31 pm, "John W. Krahn"<jwkr...@example.com> wrote:
> >> C.DeRykus wrote:
> >>> perl -we 'open(F,"./4byte"); $,="\t"; print unpack "I*",$s while read
> >>> F,$s,16'
> >>
> >> You need the -l switch for that to work the same as the OP's
> >>
> >> perl -lne'BEGIN{$/=\16;$,="\t"}print unpack"I*",$_' ./4byte
> >>
> >
> > Neat. Still, neither is safe on Win32
> > without binmode - both input/output.
> >
> > perl -lne 'use open IO=>":raw"; ..."
>
> no. perl -Mopen=IO,:raw ....
No. STD{IN,OUT,ERR} are opened before open.pm is loaded, so it doesn't
affect them:
~% PERLIO=:perlio:crlf perl -Mopen=IO,:raw
-E'say for PerlIO::get_layers \*STDIN'
unix
perlio
crlf
~%
There isn't any way to get open.pm to push any layer other than
:encoding or :utf8 onto the STD handles (no, I don't understand why
either). I think the best you're going to get is
perl -lne'BEGIN{binmode$_ for<STD{IN,OUT}>;...}...'
(now *there's* a nasty golf trick...).
Ben
------------------------------
Date: Fri, 10 Sep 2010 18:01:25 -0700
From: "John W. Krahn" <jwkrahn@example.com>
Subject: Re: convert byte stream to integers
Message-Id: <KxAio.30750$f24.17523@newsfe05.iad>
Ben Morrow wrote:
>
> Quoth sreservoir<sreservoir@gmail.com>:
>> On 9/10/2010 4:07 AM, C.DeRykus wrote:
>>> On Sep 9, 12:31 pm, "John W. Krahn"<jwkr...@example.com> wrote:
>>>> C.DeRykus wrote:
>>>>> perl -we 'open(F,"./4byte"); $,="\t"; print unpack "I*",$s while read
>>>>> F,$s,16'
>>>>
>>>> You need the -l switch for that to work the same as the OP's
>>>>
>>>> perl -lne'BEGIN{$/=\16;$,="\t"}print unpack"I*",$_' ./4byte
>>>>
>>>
>>> Neat. Still, neither is safe on Win32
>>> without binmode - both input/output.
>>>
>>> perl -lne 'use open IO=>":raw"; ..."
>>
>> no. perl -Mopen=IO,:raw ....
>
> No. STD{IN,OUT,ERR} are opened before open.pm is loaded, so it doesn't
> affect them:
>
> ~% PERLIO=:perlio:crlf perl -Mopen=IO,:raw
> -E'say for PerlIO::get_layers \*STDIN'
> unix
> perlio
> crlf
> ~%
>
> There isn't any way to get open.pm to push any layer other than
> :encoding or :utf8 onto the STD handles (no, I don't understand why
> either). I think the best you're going to get is
>
> perl -lne'BEGIN{binmode$_ for<STD{IN,OUT}>;...}...'
>
> (now *there's* a nasty golf trick...).
Yes but, Perl doesn't use STDIN with the -n or -p switch, it uses ARGV,
and if you use the -i switch as well it uses ARGVOUT instead of STDOUT.
John
--
Any intelligent fool can make things bigger and
more complex... It takes a touch of genius -
and a lot of courage to move in the opposite
direction. -- Albert Einstein
------------------------------
Date: Sat, 11 Sep 2010 02:16:26 +0100
From: Ben Morrow <ben@morrow.me.uk>
Subject: Re: convert byte stream to integers
Message-Id: <as1rl7-hg61.ln1@osiris.mauzo.dyndns.org>
Quoth jwkrahn@shaw.ca:
> Ben Morrow wrote:
> >
> > There isn't any way to get open.pm to push any layer other than
> > :encoding or :utf8 onto the STD handles (no, I don't understand why
> > either). I think the best you're going to get is
> >
> > perl -lne'BEGIN{binmode$_ for<STD{IN,OUT}>;...}...'
> >
> > (now *there's* a nasty golf trick...).
>
> Yes but, Perl doesn't use STDIN with the -n or -p switch, it uses ARGV,
> and if you use the -i switch as well it uses ARGVOUT instead of STDOUT.
True, and, good point :). It's not quite that simple, though:
~% export PERLIO=:perlio:crlf
~% echo foo >foo
~% perl -Mopen=IO,:raw -nE'say for PerlIO::get_layers \*ARGV' foo
unix
~% echo foo | perl -Mopen=IO,:raw
-nE'say for PerlIO::get_layers \*ARGV'
unix
perlio
crlf
~%
and STDOUT will still need explicitly binmoding in cases where you're
using it. (I have no idea where the :perlio went in the first case.)
Ben
------------------------------
Date: Fri, 10 Sep 2010 21:45:44 -0400
From: sreservoir <sreservoir@gmail.com>
Subject: Re: convert byte stream to integers
Message-Id: <i6en0e$37l$1@news.eternal-september.org>
On 9/10/2010 8:08 PM, Ben Morrow wrote:
> [snip]
> perl -lne'BEGIN{binmode$_ for<STD{IN,OUT}>;...}...'
>
> (now *there's* a nasty golf trick...).
INIT!
--
"Six by nine. Forty two."
"That's it. That's all there is."
"I always thought something was fundamentally wrong with the universe."
------------------------------
Date: Fri, 10 Sep 2010 21:46:20 -0400
From: sreservoir <sreservoir@gmail.com>
Subject: Re: convert byte stream to integers
Message-Id: <i6en1j$37l$2@news.eternal-september.org>
On 9/10/2010 9:16 PM, Ben Morrow wrote:
>
> Quoth jwkrahn@shaw.ca:
>> Ben Morrow wrote:
>>>
>>> There isn't any way to get open.pm to push any layer other than
>>> :encoding or :utf8 onto the STD handles (no, I don't understand why
>>> either). I think the best you're going to get is
>>>
>>> perl -lne'BEGIN{binmode$_ for<STD{IN,OUT}>;...}...'
>>>
>>> (now *there's* a nasty golf trick...).
>>
>> Yes but, Perl doesn't use STDIN with the -n or -p switch, it uses ARGV,
>> and if you use the -i switch as well it uses ARGVOUT instead of STDOUT.
>
> True, and, good point :). It's not quite that simple, though:
>
> ~% export PERLIO=:perlio:crlf
> ~% echo foo>foo
> ~% perl -Mopen=IO,:raw -nE'say for PerlIO::get_layers \*ARGV' foo
> unix
> ~% echo foo | perl -Mopen=IO,:raw
> -nE'say for PerlIO::get_layers \*ARGV'
> unix
> perlio
> crlf
> ~%
>
> and STDOUT will still need explicitly binmoding in cases where you're
> using it. (I have no idea where the :perlio went in the first case.)
conclusion: IO golfing is _hard_.
--
"Six by nine. Forty two."
"That's it. That's all there is."
"I always thought something was fundamentally wrong with the universe."
------------------------------
Date: Fri, 10 Sep 2010 19:31:32 -0500
From: brian d foy <brian.d.foy@gmail.com>
Subject: Re: FAQ 5.10 How can I use a filehandle indirectly?
Message-Id: <100920101931324710%brian.d.foy@gmail.com>
In article <slrni8ideb.nhr.hjp-usenet2@hrunkner.hjp.at>, Peter J.
Holzer <hjp-usenet2@hjp.at> wrote:
> On 2010-09-09 10:00, PerlFAQ Server <brian@theperlreview.com> wrote:
> > 5.10: How can I use a filehandle indirectly?
>
> I think this should also mention lexical filehandles.
good idea :)
>
> If you use IO::Handle, you can also use the arrow notation, which I find
> more readable for complicated expressions:
>
good idea :)
------------------------------
Date: Fri, 10 Sep 2010 16:25:17 +0200
From: Tuxedo <tuxedo@mailinator.com>
Subject: Re: Ideal data structure for nested list format?
Message-Id: <i6df4e$t89$00$1@news.t-online.com>
Sherm Pendley wrote:
> One day soon, please. Doing so will be *far* more useful to you than
> the snotty attitude you seem to think is appropriate here.
That I say I'll read the guidelines one day, means just that, even in a
positive way. In fact, I'm looking forward to it as soon as I have the
time. However, I also realise the comment could easily be misread in a
negative context, which is obviously how you read it. Personally I don't
assume the negative by default and the snotty attitude you say I *seem* to
think is appropriate here is simply not the case.
Thanks again for your advise, it was well understood the first time.
Tuxedo
------------------------------
Date: Fri, 10 Sep 2010 16:50:57 +0200
From: Tuxedo <tuxedo@mailinator.com>
Subject: Re: Ideal data structure for nested list format?
Message-Id: <i6dgkh$6h6$02$1@news.t-online.com>
Tad McClellan wrote:
[...]
> Too late.
For exactly what? Your personal plonking level?
> Off to perpetual invisibility with you!
Even after I've read your guidelines? Your words could of course be said in
a more simple language, but that may just be considered poor netiquette.
I wish you a nice day.
Tuxedo
------------------------------
Date: Fri, 10 Sep 2010 02:10:13 -0500
From: tadmc@seesig.invalid
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.9 $)
Message-Id: <jeadnTZm6v9IRBTRnZ2dnUVZ5gKdnZ2d@giganews.com>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.9 $)
This newsgroup, commonly called clpmisc, is a technical newsgroup
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postings), whether it be comments or questions.
As you would expect, clpmisc discussions are usually very technical in
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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
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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
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In this document, we use words like "must" and "should" as
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Do *NOT* send email to the maintainer of these guidelines. It will be
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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
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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
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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"
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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
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likely to find the people who know how to answer your question.
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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
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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
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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,
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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.
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do not post someone *else's* entire program.
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that explain your question, put them in a publically accessible
place (like a Web server) and provide a pointer to that location. If
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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.liamg\100cm.j.dat/"
The above message is a Usenet post.
I don't recall having given anyone permission to use it on a Web site.
------------------------------
Date: Fri, 10 Sep 2010 11:37:45 -0700 (PDT)
From: cerr <ron.eggler@gmail.com>
Subject: tcp server
Message-Id: <6df98414-23a0-4643-a93b-ea526f468743@f20g2000pro.googlegroups.com>
Hi There,
I have written a little tcp server to send out some GPS data stream
from a text to a client, the code looks something like this:
while (1) {
print "GPSsim: sending data to PRG \n";
open (my $handle, '<', $filename) or die "Can't open '$filename'
for reading: $!";
foreach $line (<$handle>) {
print $client "<IsiPut><GPRMC>".$line."</GPRMC></
IsiPut><IsiPut><ScheduleDeviation>0</ScheduleDeviation><RouteState>2</
RouteState><TripMode>1</TripMode></IsiPut>";
#print "<IsiPut><GPRMC>".$line."</GPRMC></
IsiPut><IsiPut><ScheduleDeviation>0</ScheduleDeviation><RouteState>2</
RouteState><TripMode>1</TripMode></IsiPut>\n";
if (!<$client>) {
print "GPSsim: CLIENT DISCONNECTED - exit!\n";
close($sock);
exit(99);
}
sleep(1);
}
}
now my problem is that <$client> sometimes seem to become false and
thus my program exits even tho the client is still there and
listening! How does this happen and how can i overcome this problem so
i can put (<$client>) in the while instead of (1). I realize that this
is dirty, please do not comment on this.... :P
Thank you for hints and suggestions!
Ron
------------------------------
Date: Fri, 10 Sep 2010 14:50:08 -0500
From: "J. Gleixner" <glex_no-spam@qwest-spam-no.invalid>
Subject: Re: tcp server
Message-Id: <4c8a8bf1$0$89872$815e3792@news.qwest.net>
cerr wrote:
> Hi There,
>
> I have written a little tcp server to send out some GPS data stream
> from a text to a client, the code looks something like this:
Missing:
use strict;
use warnings;
>
> while (1) {
> print "GPSsim: sending data to PRG \n";
> open (my $handle, '<', $filename) or die "Can't open '$filename'
> for reading: $!";
>
> foreach $line (<$handle>) {
for my $line ( <$handle> ) {
> print $client "<IsiPut><GPRMC>".$line."</GPRMC></
> IsiPut><IsiPut><ScheduleDeviation>0</ScheduleDeviation><RouteState>2</
> RouteState><TripMode>1</TripMode></IsiPut>";
> #print "<IsiPut><GPRMC>".$line."</GPRMC></
> IsiPut><IsiPut><ScheduleDeviation>0</ScheduleDeviation><RouteState>2</
> RouteState><TripMode>1</TripMode></IsiPut>\n";
Why include commented out lines in your post? It's just more noise..
> if (!<$client>) {
> print "GPSsim: CLIENT DISCONNECTED - exit!\n";
> close($sock);
> exit(99);
> }
> sleep(1);
> }
> }
>
> now my problem is that <$client> sometimes seem to become false and
First, you do understand what <$client> does, right?
> thus my program exits even tho the client is still there and
> listening! How does this happen and how can i overcome this problem so
> i can put (<$client>) in the while instead of (1). I realize that this
> is dirty, please do not comment on this.... :P
>
> Thank you for hints and suggestions!
You don't show what $client or $sock is, post actual code! However,
before doing that, the document to study would be:
perldoc perlipc
There is a lot of good information in there and maybe the area with the
"TCP Servers with IO::Socket" heading might help with this specific
question.
------------------------------
Date: Sat, 11 Sep 2010 00:15:35 +0200
From: Martijn Lievaart <m@rtij.nl.invlalid>
Subject: Re: tcp server
Message-Id: <79nql7-o1b.ln1@news.rtij.nl>
On Fri, 10 Sep 2010 11:37:45 -0700, cerr wrote:
>
> now my problem is that <$client> sometimes seem to become false and thus
> my program exits even tho the client is still there and listening! How
> does this happen and how can i overcome this problem so i can put
> (<$client>) in the while instead of (1). I realize that this is dirty,
> please do not comment on this.... :P
Did you read the posting guidelines? There is so much missing in your
program, your question is impossible to answer. Construct a minimal
program that exhibits the problem and post that.
HTH,
M4
------------------------------
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Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
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------------------------------
End of Perl-Users Digest V11 Issue 3127
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