use CreatePicture in .NET

By Xiaodong Liang

Issue
We use automation to start the Navisworks manage and then create a snapshot by CreatePicture. This program worked on 32bits, but failed on 64bits OS.

Solution CreatePicture can only be used by in-process application because the output is IPictureDisp which cannot be passed across process boundaries. The MSDN knowledge base tells more: http://support.microsoft.com/kb/150034/en-us Following is the code snippet of a .NET plugin.

 

using Autodesk.Navisworks.Api;

using Autodesk.Navisworks.Api.Plugins; 

using ComApi = Autodesk.Navisworks.Api.Interop.ComApi;

using ComApiBridge = Autodesk.Navisworks.Api.ComApi;

void createPic()

{

  ComApi.InwOpState10 state;

  state = ComApiBridge.ComApiBridge.State;

 

  stdole.IPictureDisp img;

  IntPtr hbitmap;

  System.Drawing.Bitmap bm = null;

 

 

  img = (stdole.IPictureDisp)state.CreatePicture(state.CurrentView, null, 640, 800);

  if (img.Handle != 0)

  {

      hbitmap = new System.IntPtr(img.Handle);

      bm = System.Drawing.Bitmap.FromHbitmap(hbitmap);

 

      bm.Save("c:\\dem_test.bmp");

  }

  img = null;

 

}