How to get the length and width of 3D scene of SolidWorks?

Hi,

I want to get the height and width of 3D scene of solidworks.

I have used ISldWorks::get_FrameWidth() and ISldWorks::get_FrameHeight. 

But I think that it gives solidworks frame width and height not 3D scene?

Which API I use to get height and width of 3D scence?

I want height and width of highlighted area in solidworks.

SolidworksApi/macros