You mixed and matched the 2- and 4-arg version, and you don't actually pass your arguments?! 
use Win32::API;

my $prwin1 = Win32::API->new('OH-DLL.dll', 'prwin1', 'PP', 'D')
    or die("Error linking to prwin1: $^E\n");

sub pl_prwin
{
    my $hands = "AhKh|Td9s|QQ+,AQs+,AQo+|JJ-88|XxXx|XxXx|XxXx";
    my $board = "Ks7d4d";
    return $prwin1->Call($hands, $board);
}

[download]

Update: Fixed return type, as per tye's reply. Forgot to check that. Also added error message.

In reply to Re: Win32::API question by ikegami
in thread Win32::API question by gbotzz

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