Hi,

https://metacpan.org/pod/Win32::API#USING-STRUCTURES gives some explanation about "LP" prefix

Here is a modified version of samples/GetCursorPos.pl 

#!/usr/bin/perl --
use strict;
use warnings;
use Data::Dump qw/ dd /;
use Win32::API;

Win32::API::Struct->typedef(
    POINT => qw(
        LONG x;
        LONG y;
        )
);

Win32::API->Import('user32' => 'BOOL GetCursorPos(LPPOINT pt)');

#### using OO semantics
my $pt = Win32::API::Struct->new('POINT');
@{$pt}{qw/x y/} = (0,0);
GetCursorPos($pt) or die "GetCursorPos failed: $^E";
print "Cursor is at: $pt->{x}, $pt->{y}\n";

#### using tie semantics
my %pt;
tie %pt, 'Win32::API::Struct' => 'POINT';
@pt{qw/x y/}=(0,0);
GetCursorPos(\%pt) or die "GetCursorPos failed: $^E";
print "Cursor is at: $pt{x}, $pt{y}\n";

dd( map{ { "is_known $_ ", Win32::API::Type->is_known($_)}; } qw{ POIN
+T LPPOINT } );
__END__
Cursor is at: 198, 273
Cursor is at: 198, 273
({ "is_known POINT " => 1 }, { "is_known LPPOINT " => "" })

[download]

so POINT is know, but LPPOINT is not known, and that isn't a problem

In reply to Re^3: Win32::API and keyboard hook by beech
in thread Win32::API and keyboard hook by frazap

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