My fault, it is ISkpDocument*, not ISketchUpDocument*.
Now it works!
Thank you very much!

Thanks for answer.
Reading only would be fine.

When I execute:

UI.messagebox IleD.call Sketchup.active_model.skpdoc

extern "C" int GetNum2(sketchup;;ISketchUpDocument*pDoc)
{
	return pDoc->IsValid();
}

it crashes, so I assume pDoc pointer is wrong.

when I change it for
return 2;

it shows 2.

Any ideas, what may be wrong?

Hi,
I am working with SU sample plugin from TBD (many thanks for that).
I have c++ dll with function:

extern "C" int GetNum2(void * spApp)
{
sketchup::ISketchUpDocument* pDoc = (sketchup::ISketchUpDocument*)spApp;

return pDoc->IsValid();

}

suddl.def:
EXPORTS
GetNum2

In .rb file I have:

mydll = path + "/SUDLL.dll"
IleD = Win32API.new(mydll,"GetNum2",["P"],"I");
UI.messagebox IleD.call(Sketchup.???)

Is it possible to pass ISketchUpDocument pointer from Sketchup, to manipulate current view by c++ plugin?
For example to write a c++ function that will move all points by Vector(10,0,0)?