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Subject Author Date
Access a c++ module from Perl bg-greece 10-24-2005
Posted by bg-greece on October 24, 2005, 6:21 pm
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I am using cygwin and perl and trying to access some function from a C++
windows dll. After the first attempt produced a segmentation fault, I tried
to do it step-by-step. I created a dummy function in the dll file:

int TestDLL(int x)
{
return 1;
}


and put the following code in a perl file:

use strict;
use Win32::API::Prototype;

my $TestDLL = ApiLink("mydll",'I TestDLL(I x)');
if (not defined $TestDLL) {
die "Can't import API TestDLL: $! \n";
}
print "ApiLink done\n";

my $xx = 0;
my $return = $TestDLL->Call($xx);
print $return."\n";


But even this produces a segmentation fault (core dump). Any ideas?

BG




Posted by John Bokma on October 24, 2005, 3:35 pm
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> I am using cygwin and perl and trying to access some function from a
> C++ windows dll. After the first attempt produced a segmentation
> fault, I tried to do it step-by-step. I created a dummy function in
> the dll file:

....

> But even this produces a segmentation fault (core dump). Any ideas?

Just a very wild guess: you wrote Cygwin. How did you make the DLL? Inside
Cygwin, or outside it?

--
John Small Perl scripts: http://johnbokma.com/perl/
Perl programmer available: http://castleamber.com/
I ploink googlegroups.com :-)



Posted by bg-greece on October 25, 2005, 12:00 pm
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the dll was created with with Microsoft Visual C++ 6.0


> Just a very wild guess: you wrote Cygwin. How did you make the DLL? Inside
> Cygwin, or outside it?
>
> --
> John Small Perl scripts: http://johnbokma.com/perl/
> Perl programmer available: http://castleamber.com/
> I ploink googlegroups.com :-)
>




Posted by harryfmudd [AT] comcast [DOT] on October 25, 2005, 2:51 pm
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bg-greece wrote:
> the dll was created with with Microsoft Visual C++ 6.0

Are you using the Cygwin distribution of Perl? I think you will find
that it was _not_ made with Visual C++ V6, but with gcc.

I personally have had good luck with Win32::API, though sometimes it was
not obvious how to describe the function I wanted to import, and when
you get the description wrong, you do get segment violations. I do not
remember using the new, sexy prototype interface, just the old, clunky
one. See Win32::Process::Info::NT for an example.

Disclaimer: I wrote the cited module. And I never said it was a _good_
example.

Tom Wyant


Posted by John Bokma on October 26, 2005, 12:50 am
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>> Just a very wild guess: you wrote Cygwin. How did you make the DLL?
>> Inside Cygwin, or outside it?

> the dll was created with with Microsoft Visual C++ 6.0

That might cause the problem(s) you see.

--
John Small Perl scripts: http://johnbokma.com/perl/
Perl programmer available: http://castleamber.com/
I ploink googlegroups.com :-)



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