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# See the bottom of this file for the POD documentation. Search for the
# string '=head'.
#######################################################################
#
# Win32::API::Callback - Perl Win32 API Import Facility
#
# Author: Aldo Calpini <dada@perl.it>
# Maintainer: Cosimo Streppone <cosimo@cpan.org>
#
# $Id: Callback.pm 458 2009-01-17 17:27:43Z cosimo.streppone $
#
#######################################################################
package Win32::API::Callback;
$VERSION = '0.59';
require Exporter; # to export the constants to the main:: space
require DynaLoader; # to dynuhlode the module.
@ISA = qw( Exporter DynaLoader );
sub DEBUG {
if ($WIN32::API::DEBUG) {
printf @_ if @_ or return 1;
} else {
return 0;
}
}
use Win32::API;
use Win32::API::Type;
use Win32::API::Struct;
#######################################################################
# This AUTOLOAD is used to 'autoload' constants from the constant()
# XS function. If a constant is not found then control is passed
# to the AUTOLOAD in AutoLoader.
#
sub AUTOLOAD {
my($constname);
($constname = $AUTOLOAD) =~ s/.*:://;
#reset $! to zero to reset any current errors.
$!=0;
my $val = constant($constname, @_ ? $_[0] : 0);
if ($! != 0) {
if ($! =~ /Invalid/) {
$AutoLoader::AUTOLOAD = $AUTOLOAD;
goto &AutoLoader::AUTOLOAD;
} else {
($pack,$file,$line) = caller;
die "Your vendor has not defined Win32::API::Callback macro $constname, used at $file line $line.";
}
}
eval "sub $AUTOLOAD { $val }";
goto &$AUTOLOAD;
}
#######################################################################
# dynamically load in the API extension module.
#
bootstrap Win32::API::Callback;
#######################################################################
# PUBLIC METHODS
#
sub new {
my($class, $proc, $in, $out) = @_;
my %self = ();
# printf "(PM)Callback::new: got proc='%s', in='%s', out='%s'\n", $proc, $in, $out;
$self{in} = [];
if(ref($in) eq 'ARRAY') {
foreach (@$in) {
push(@{ $self{in} }, Win32::API::type_to_num($_));
}
} else {
my @in = split '', $in;
foreach (@in) {
push(@{ $self{in} }, Win32::API::type_to_num($_));
}
}
$self{out} = Win32::API::type_to_num($out);
$self{sub} = $proc;
my $self = bless \%self, $class;
DEBUG "(PM)Callback::new: calling CallbackCreate($self)...\n";
my $hproc = CallbackCreate($self);
DEBUG "(PM)Callback::new: hproc=$hproc\n";
#### ...if that fails, set $! accordingly
if(!$hproc) {
$! = Win32::GetLastError();
return undef;
}
#### ok, let's stuff the object
$self->{code} = $hproc;
$self->{sub} = $proc;
#### cast the spell
return $self;
}
sub MakeStruct {
my($self, $n, $addr) = @_;
DEBUG "(PM)Win32::API::Callback::MakeStruct: got self='$self'\n";
my $struct = Win32::API::Struct->new($self->{intypes}->[$n]);
$struct->FromMemory($addr);
return $struct;
}
1;
__END__
#######################################################################
# DOCUMENTATION
#
=head1 NAME
Win32::API::Callback - Callback support for Win32::API
=head1 SYNOPSIS
use Win32::API;
use Win32::API::Callback;
my $callback = Win32::API::Callback->new(
sub { my($a, $b) = @_; return $a+$b; },
"NN", "N",
);
Win32::API->Import(
'mydll', 'two_integers_cb', 'KNN', 'N',
);
$sum = two_integers_cb( $callback, 3, 2 );
=head1 FOREWORDS
=over 4
=item *
Support for this module is B<highly experimental> at this point.
=item *
I won't be surprised if it doesn't work for you.
=item *
Feedback is very appreciated.
=item *
Documentation is in the work. Either see the SYNOPSIS above
or the samples in the F<samples> directory.
=back
=head1 AUTHOR
Aldo Calpini ( I<dada@perl.it> ).
=head1 MAINTAINER
Cosimo Streppone ( I<cosimo@cpan.org> ).
=cut
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