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- package Win32::API::Callback;
-
- # See the bottom of this file for the POD documentation. Search for the
- # string '=head'.
-
- #######################################################################
- #
- # Win32::API::Callback - Perl Win32 API Import Facility
- #
- # Version: 0.41
- # Date: 10 Mar 2003
- # Author: Aldo Calpini <dada@perl.it>
- # $Id: Callback.pm,v 1.0 2001/10/30 13:57:31 dada Exp $
- #######################################################################
-
- $VERSION = "0.41";
-
- require Exporter; # to export the constants to the main:: space
- require DynaLoader; # to dynuhlode the module.
- @ISA = qw( Exporter DynaLoader );
-
- sub DEBUG {
- if ($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> ).
-
- =cut
-
-
-