[lazarus] GetWindowLong

[Shane Miller]

I am working on the function GetWindowLong.  You pass a handle (in gtk's case it's the pgtkwidget being passed) and a constant that identifies what element you are looking for.

In this case we are interested in Window Style (GWL_STYLE), handle to the parent (GWL_HWNDPARENT), the HInstance for the window (GWL_HINSTANCE) , the address of the wndproc (GWL_WNDPROC) and other things of that nature.

Without the class (the sender) I can't acceess the Parent property, or the address of the classes wndproc so I was thinking of doing a 
gtk_object_set_data when the widget is created to store the parent and itself (the sender property) and then I can get most of that stuff from that.

Anyone have an alternative suggestion???

Shane