How to get IViewObject interface of the office document?

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  Hi,

   How can I get IViewObject interface for the Powerpoint presentations (slideshow) that I load from my code?

  The following code throws casting exception.

  I will use IViewObject::Draw method to draw to a memory DC to convert the slideshow to video.

  Thanks in advance.
  

  using Microsoft.Office.Core;

  using Microsoft.Office.Interop.PowerPoint;

  using Microsoft.VisualStudio.OLE.Interop;

  Microsoft.Office.Interop.PowerPoint.Application oApp;

  oApp = new Microsoft.Office.Interop.PowerPoint.Application();

  // animation load & slideshow playback code here

  IViewObject vo;

  vo = (IViewObject)(oApp.ActivePresentation);  // THROWS EXCEPTION

  
  

  Friday, January 30, 2009 1:45 AM