public POINTL dmPosition;

    Public dmPositionX As Integer ' Using a PointL Struct does not work

struct POINTL

POINTL was incorrectly declared to use longs instead of ints, this has been fixed.

    public POINTL dmPosition;

       public System.Drawing.Point pointl;

    Public pointl As System.Drawing.Point

    public Point pointl;

     Public pointl As Point

First i tried it with a PointL struct dmPosition.x and dmPosition.y until i luckily found this page:

static extern TODO PointL(TODO);

Declare Function PointL Lib "user32.dll" (TODO) As TODO