I was considering a reply to Need to determine state of mousepointer, thinking it would be easy, just a few trips to the right APIs, when lo - I got stuck calling GetCursorInfo (user32.dll).

use strict;
use warnings;

use Data::Dumper;
use Win32::API;

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

Win32::API::Struct->typedef( PCURSORINFO => qw{
    DWORD cbSize;
    DWORD flags;
    HCURSOR hCursor;
    POINT ptScreenPos;
});

my $pci = Win32::API::Struct->new('PCURSORINFO');

$pci->{cbSize} = $pci->sizeof();

Win32::API->Import("user32", "BOOL GetCursorInfo(PCURSORINFO pci)");

print Dumper($pci);  # before, empty but for cbSize

my $result = GetCursorInfo($pci) or die $^E; # DIES HERE, RESULTS BELO
+W

print Dumper($pci);  # after, hopefully full of useful information
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This dies upon calling GetCursorInfo because - as documented - the result is zero, and $^E (ie GetLastError) is telling me my parameter is incorrect -

The parameter is incorrect at getmouseshape.pl line 27, <DATA> line 16
+4.
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And here is $pci before dying

$VAR1 = bless( {
                 '__typedef__' => 'PCURSORINFO',
                 'ptScreenPos' => bless( {
                                           '__typedef__' => 'POINT',
                                           'typedef' => [
                                                          [
                                                            'x',
                                                            'l',
                                                            'LONG'
                                                          ],
                                                          [
                                                            'y',
                                                            'l',
                                                            'LONG'
                                                          ]
                                                        ]
                                         }, 'Win32::API::Struct' ),
                 'cbSize' => 16,
                 'typedef' => [
                                [
                                  'cbSize',
                                  'L',
                                  'DWORD'
                                ],
                                [
                                  'flags',
                                  'L',
                                  'DWORD'
                                ],
                                [
                                  'hCursor',
                                  'L',
                                  'HCURSOR'
                                ],
                                [
                                  'ptScreenPos',
                                  '>',
                                  'POINT'
                                ]
                              ]
               }, 'Win32::API::Struct' );
[download]