Thank you, I understand that I'm in the wierd option of 32 bit perl for 64 int, Intel and Windows XP (but perl running through Cygwin). I think your post will be very helpful when I make the simplified example from my previous post work and I move into the original problem.

As a quick refresh, the simplified example from my previous post: 

    #### import an API that uses this structure
    my $getCursor = new Win32::API('user32', 'GetCursorPos','S','N');
    
    #### create a 'POINT' object
    $lpPoint=pack('LL',0,0);
    #### call the function passing our structure object
    $getCursor->Call($lpPoint);
    
    #### and now, access its members
    my ($x,$y) = unpack('LL',$pt);
    print "The cursor is at: ".$x.", ".$y."\n";

[download]
No matter which parameter I use within pack ('J','L','N','Q' or 'V') in $lpPoint=pack('LL',0,0); I still get the error "Can't call method Pack on a undefined value". The error pops up in $getCursor->Call($lpPoint);.

From CPAN doc on Win32::API seems that I can substitute the Win32::API::Struct for the packed variable and then pass it to the Win32::API object. Any idea what I'm missing?

In reply to Re^2: Low-level version of Win32::API::Struct by sgv_81
in thread Low-level version of Win32::API::Struct by sgv_81

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