Timing problem? - CPAN::Forum

Posted on 2005-11-24 11:42:07-08 by jstenzel

Timing problem?

Hello,

when reading the fields of a form in a loop with code like this (with W32::IE::M 0.009 under XP with pxperl 5.8.7):

foreach my $field (@fields) { my $val=$ie->value($field); $ie->_wait_while_busy(); ... }

at a point W32::IE:M stops operation saying: "Can't call method "value" on an undefined value at C:/PXPerl/site/lib/Win32/IE/Form.pm line 232."

As this can be fixed by an extra delay with

foreach my $field (@fields) { sleep(1); my $val=$ie->value($field); $ie->_wait_while_busy(); ... }

I suppose it's time of a timing problem?

Thanks in advance

Jochen Stenzel

Direct Responses: 1402 | 1404 | Write a response

Posted on 2005-11-24 11:44:07-08 by jstenzel in response to 1401

Re: Timing problem?

The last part should read "... kind of a timing problem", of course. jstenzel

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Posted on 2005-11-25 10:26:50-08 by abeltje in response to 1401

Re: Timing problem?

Hi Jochen,
First of all, could you try 0.009_17 from CPAN?
Second, there should be no need to call _wait_while_busy()!

I can't tell how you filled @fields, but I would write it as:

my @fields = $ie->current_form->inputs; for my $field ( @fields ) { my $val = $field->value; ... }

HTH,
-- Abe.

Direct Responses: 1854 | Write a response

Posted on 2006-02-26 11:18:42-08 by geoffmulhall in response to 1404

Re: Timing problem?

Hi, I've just installed vers 0.008 and I get a lot of "Can't call method "find_input" on an undefined value at .... mechanize.pm line 914" In one section of code I'm looping through a file retrieving the same form, extracting data using HTML::TableExtract. I have a sleep(1) inside the loop but ocassionally I get the error. One thing I've not been able to do is successfully login to a site. I ALWAYS get the error above. Any ideas how to overcome, BTW Win32-IE-Mechanize is great ! Geoff

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Posted on 2006-06-25 13:54:31-07 by erik in response to 1854

Re: Timing problem?

I have these problems too. I found the error occurs either when a page is not completely loaded or when there are several forms on a page and Mech does not know what form to adress. Would be nice to at least not have the error to brake the running of the script. I would prefer that it just logs the error and then continues with the next task. Overall I am not very happy with the wait_while_busy function.

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Posted on 2006-07-24 16:31:58-07 by robert in response to 2533

Re: Timing problem?

I use WIN32::OLE module. I found this small subroutine that waits for IE. If you are using IE, or have IE, then this might work for you. You can also just set visible to false and it would work almost like Mech does.

sub WaitForBusy { while ($IEbrowser->{Busy} == 1) { sleep(0.5); } }

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Posted on 2006-11-11 14:02:38-08 by erik in response to 2684

Re: Timing problem?

I tested but it does not help at all, still get those annoying error messages and interrupted executions.

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Posted on 2006-11-11 14:14:37-08 by erik in response to 3494

Re: Timing problem?

However this finally did it: while($ie->{agent}->Document->readyState !~ /complete/i){ sleep(0.5); }

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