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• Access denied from another thread

  - by Lobuno

  Hello! In a program I span a thread ("the working thread"). Hera I copy some files write some data to a database and eventually, delete some other files or directories. Everything works fine. The problem is now, that I decided to move the deleting operation to some other thread. So the working thread now copies the files or directories, writes to the database, and , if there is a need to delete some other files this thread spans another thread and that second thread deleted the needed files or directories. The problem is that,the deletion used to work 100% when done in the working thread, now when the same is done in the secondary thread, I sometimes get an "Access denied" error and the files cannot be deleted. And no, the working thread is definitely NOT acceding the files and directories to delete at this moment. Sometimes (but not always) the main thread is impersonating some user, so if needed , the deleting thread is also running under impersonation just to grant the needed permissions to delete the files, so that should not be the problem. Anybody has a clue why this could be happening?

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• Does the managed main UI thread stay on the same (unmanaged) Operation System thread?

  - by Daniel Rose

  I am creating a managed WPF UI front-end to a legacy Win32-application. The WPF front-end is the executable; as part of its startup routines I start the legacy app as a DLL in a second thread. Any UI-operation (including CreateWindowsEx, etc.) by the legacy app is invoked back on the main UI-thread. As part of the shutdown process of the app I want to clean up properly. Among other things, I want to call DestroyWindow on all unmanaged windows, so they can properly clean themselves up. Thus, during shutdown I use EnumWindows to try to find all my unmanaged windows. Then I call DestroyWindow one the list I generate. These run on the main UI-thread. After this background knowledge, on to my actual question: In the enumeration procedure of EnumWindows, I have to check if one of the returned top-level windows is one of my unmanaged windows. I do this by calling GetWindowThreadProcessId to get the process id and thread id of the window's creator. I can compare the process id with Process.GetCurrentProcess().Id to check if my app created it. For additional security, I also want to see if my main UI-thread created the window. However, the returned thread id is the OS's ThreadId (which is different than the managed thread id). As explained in this question, the CLR reserves the right to re-schedule the managed thread to different OS threads. Can I rely on the CLR to be "smart enough" to never do this for the main UI thread (due to thread-affinity of the UI)? Then I could call GetCurrentThreadId to get the main UI-thread's unmanaged thread id for comparison.

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• Is there any performance comparison between Perl web frameworks?

  - by DVK

  I have seen mentions (which sounded like unsubstantiated opinions, and dated ones at that) that Embperl is the fastest Perl web framework. I was wondering if there's a consensus on the relative speed of the major stable Perl web frameworks, or ideally, some sort of fact-based performance comparisons between implementations of the same sample webapps, or individual functionalities (e.g. session handling or form data processing), etc...?

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• How can I get a call stack listing in Perl?

  - by slashmais

  Is there a way I can access (for printout) a list of sub + module to arbitrary depth of sub-calls preceding a current position in a Perl script? I need to make changes to some Perl modules (.pm's). The workflow is initiated from a web-page thru a cgi-script, passing input through several modules/objects ending in the module where I need to use the data. Somewhere along the line the data got changed and I need to find out where.

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• Why can't the w3c validator find the Perl's SGML::Parser::OpenSP?

  - by coure06

  I have installed W3C validator locally on Windows, following their instructions. I am getting this error while validating a site: Can't locate loadable object for module SGML::Parser::OpenSP in @INC (@INC contains: C:/www/perl/site/lib C:/www/perl/lib .) at C:/www/validator/httpd/cgi-bin/check line 60 Compilation failed in require at C:/www/validator/httpd/cgi-bin/check line 60. BEGIN failed--compilation aborted at C:/www/validator/httpd/cgi-bin/check line 60. I am using SGML::Parser::OpenSP 0.991 module.

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• Is there any way to read Matlab's .mat files in Perl?

  - by Nathan Fellman

  I have some data generated in Matlab that I want to process using Perl. I saved the data from Matlab in a .mat file. Is there any way to read it in Perl?

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• How can I capture the output and exit value of a subprocess in Perl? [closed]

  - by Ryan Thompson

  Possible Duplicate: How do you capture stderr, stdout, and the exit code all at once, in Perl? I'm writing a Perl script that needs to call a subprocess and capture both the output and the exit value. Is there a way to get both?

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• Which module should I use to parse mediawiki text into a Perl data structure?

  - by Ivan

  I just need to parse the wikitext into Perl arrays of hashes. I found several modules. The Text::MediawikiFormat seems to be what I need, but it returns HTML, and I want a Perl data structure. I also looked at: Parse::MediaWikiDump Text::WikiText Convert::Wiki

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• How can I display a Perl/Tk window in the bottom righthand corner?

  - by pavun_cool

  I have planned to do the chatting the exercise Perl socket. In this I want to display the require window using Perl/Tk. Here my requirement is that the window has to display in the bottom right corner. It is like Gmail Chat window. What do I need to achieve this? By default it displays in top left corner.

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• How do I receive and respond to Ajax requests in Perl?

  - by Peterim

  I have a client-side appliction which submits some data via AJAX POST request (request.open("POST", url, flag)) to my Perl CGI script. How do I retrieve this data with Perl and return some other data (AJAX response)?

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• Where can I find information about Perl's special variables?

  - by Sinan Ünür

  Perl has quite a few special variables such as @F, $!, %! ... etc. Where are all Perl's special variables documented?

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• How can I use Perl's s/// in an expression?

  - by mikeY

  I got a headache looking for this: How do you use s/// in an expression as opposed to an assignment. To clarify what I mean, I'm looking for a perl equivalent of python's re.sub(...) when used in the following context: newstring = re.sub('ab', 'cd', oldstring) The only way I know how to do this in perl so far is: $oldstring =~ s/ab/cd/; $newstring = $oldstring; Note the extra assignment.

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• Is there something like "New Relic" for Perl apps?

  - by Cninroh

  We have successfully migrated all of our PHP and Ruby apps to use New Relic RPM both for Application performance measurements and server monitoring. We are very please with results, which have enabled us to improve the overall performance of the platfrom numeral times. We still have a lot of Perl applications which we need to support for legacy purposes, but in comparison to our New Relic powred apps we are completely blind to whats happening inside the apps and in peak hours. Is there something like "New Relic" for Perl apps?

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• How can I generate an XML using Perl and XSLT?

  - by swatirekha

  I want to generate an XML file using Perl and XSLT. Is it possible to achieve this by updating the XSLT dynamically by uusing values from a hash? Or is there any better solution for wirting a simple XML file using Perl?

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• In Perl what's the difference between a package and a module? [closed]

  - by Hermann Ingjaldsson

  Possible Duplicate: What is the difference between package, module and class in object oriented Perl? In Perl what's the difference between a package and a module?

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• How to execute a perl script within php and capture error messages?

  - by Marcel Tjandraatmadja

  I am trying to execute a Perl script like so: /usr/bin/ec2-consistent-snapshot 'vol-dr3131c2' When the Perl script fails it exits using 'die' and prints out an error message. I can see that error message when executing manually, but I am failing to capture it through PHP. I tried the following with no success: exec($command,$output); echo system($command,$output); passthru($command); Any ideas?

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• How do i make a multi-threaded server in perl?

  - by David

  I have looked online at making a multi-threaded server in perl, but i cannot find any good ones that clearly explain how to create one. I have created a server and client in perl but i do not seem to be able to make it multi-threaded. Can someone help me?

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• What is the difference between using $1 vs \1 in Perl regex substitutions?

  - by Mr Foo Bar

  I'm debugging some code and wondered if there is any practical difference between $1 and \1 in Perl regex substitutions For example: my $package_name = "Some::Package::ButNotThis"; $package_name =~ s{^(\w+::\w+)}{$1}; print $package_name; # Some::Package This following line seems functionally equivalent: $package_name =~ s{^(\w+::w+)}{\1}; Are there subtle differences between these two statements? Do they behave differently in different versions of Perl?

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• How can I use perl to get a SHA1 hash of a file from the Windows command line?

  - by Jim

  I have a file called "secure.txt" in c:\temp. I want to run a perl command from the command line to print the SHA1 hash of secure.txt. I'm using ActivePerl 5.8.2. I have not used perl before, but it's the most convenient option available right now.

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• What is the best GUI for Perl on Windows including a good GUI builder?

  - by panofish

  I want to build perl apps with a gui that: A: are windows compatible (no cygwin or the like) B: utilize a nice GUI builder C: is easily distributed (minimizing additional components that must be installed) D: has good documentation and tutorials for building and using the GUI E: is still be developed (has a future) and appears to be the future of perl GUIs Maybe someone could provide a table something like the following for the alternatives (wxperl, perlqt, tk gtk2...etc)?: tool1 = AB tool2 = CE tool3 = ACD ...

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• As a PHP developer thinking of making Perl a secondary strong suit, what do I need to know?

  - by Hexagon Theory

  I consider myself quite fluent in PHP and am rather familiar with nearly all of the important aspects and uses, as well as its pratfalls. This in mind, I think the major problem in taking on Perl is going to be with the syntax. Aside from this (a minor hindrance, really, as I'm rather sold on the fact that Perl's is far more readable), what are some key differences you think I should make myself aware of prior to taking on the language?

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• How to make lists automatically instantiate on use in Python as they do in Perl?

  - by aXqd

  In Perl, I can do this: push(@{$h->[x]}, y); Can I simplify the following python codes according to above Perl example? if x not in h: h[x] = [] h[x].append(y) I want to simplify this, because it goes many places in my code, (and I cannot initialize all possible x with []). I do not want to make it a function, because there is no 'inline' keyword. Any ideas?

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• What are the most interesting/useful new things in Perl 5.12?

  - by hillu

  I remember quickly adopting given .. when, say, //, and the smart matching operator when Perl 5.10 came around. What do you consider the most useful fixes and features introduced with Perl 5.12.0?

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• Do you use an exception class in your Perl programs? Why or why not?

  - by daotoad

  I've got a bunch of questions about how people use exceptions in Perl. I've included some background notes on exceptions, skip this if you want, but please take a moment to read the questions and respond to them. Thanks. Background on Perl Exceptions Perl has a very basic built-in exception system that provides a spring-board for more sophisticated usage. For example die "I ate a bug.\n"; throws an exception with a string assigned to $@. You can also throw an object, instead of a string: die BadBug->new('I ate a bug.'); You can even install a signal handler to catch the SIGDIE psuedo-signal. Here's a handler that rethrows exceptions as objects if they aren't already. $SIG{__DIE__} = sub { my $e = shift; $e = ExceptionObject->new( $e ) unless blessed $e; die $e; } This pattern is used in a number of CPAN modules. but perlvar says: Due to an implementation glitch, the $SIG{DIE} hook is called even inside an eval(). Do not use this to rewrite a pending exception in $@ , or as a bizarre substitute for overriding CORE::GLOBAL::die() . This strange action at a distance may be fixed in a future release so that $SIG{DIE} is only called if your program is about to exit, as was the original intent. Any other use is deprecated. So now I wonder if objectifying exceptions in sigdie is evil. The Questions Do you use exception objects? If so, which one and why? If not, why not? If you don't use exception objects, what would entice you to use them? If you do use exception objects, what do you hate about them, and what could be better? Is objectifying exceptions in the DIE handler a bad idea? Where should I objectify my exceptions? In my eval{} wrapper? In a sigdie handler? Are there any papers, articles or other resources on exceptions in general and in Perl that you find useful or enlightening.

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• How can I check the MIME type of an uploaded file using Perl CGI?

  - by FOOM

  I'm trying to get the MIME type of an <input type="file" /> element using Perl, but without actually examining the contents of the file itself, In other words, just using the HTTP headers. I have only been able to get the "multipart/form-type" Content-Type value, but my understanding is that each element will get its own MIME Type? How can I see the sub-MIME types using Perl?

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