Reading DWG/DXF (v7)

Dealing with DWG/DXF files in Eyeshot requires several additional steps compared to other standard CAD file formats. As all professional CAD systems do, Eyeshot relies on Open Design Alliance for this file format translation. This tool still contains some legacy DLLs that cannot be copied automatically by Visual Studio. You'll find all the necessary DLLs inside the Bin folders of the Eyeshot installation.

Basically, the required steps to read/write DWG/DXF files are:

  1. Prepare a working Eyeshot based Visual Studio project (or start from one of the source code samples)
  2. Change the Target Platform of your Visual Studio project to x86
  3. Add the Bin\x86\devDept.Eyeshot.Control.x86.dll to your Visual Studio project references
  4. Change the type of the viewportLayout1 control from ViewportLayout to ViewportLayoutEx in the Form designer file1
  5. Manually copy the Bin\x86\AcIdViewObj_3.09_10.tx and RecomputeDimBlock_3.09_10.tx files to your Bin/Debug or Bin/Release folder2
  6. Add the ViewportLayoutEx.ReadAutodesk()/WriteAutodesk() call in your code3

1 If you plan to use the ReadAutodesk class this step is not strictly necessary
2 These *.tx files can be easily added to your Visual Studio project as well to automate the file copy operation
3 ViewportLayoutEx.ReadAutodesk() is performed asynchronously. To take full control on how the file import is performed use directly the ReadAutodesk class (see Import/Export topic of the documentation)

Please note that once completed the steps above, the number of Eyeshot DLLs in the project references will be three compared to the single one of Eyeshot 6.0.

On end-user machines the Microsoft Visual C++ 2010 Redistributable Package is also required.


Previous versions of this article: Eyeshot 6

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  • Hello Alberto,

    These new files appear in my bin folder. From where do they come?

















  • Hi Alex,

    they come from the Bin/x86 or Bin/x64 folder of step 3 above.

    They are needed to read / write Autodesk files and are automatically copied.

    You also need to copy the other 2 tx files as explained in step 5 above, because they are not automatically copied.

  • I have updated everything, but the component does not have:

    WriteAutodesk or ReadAutodesk.  Does v7 have new commands?

  • Hello Robert,

    The commands are there. Make sure your viewportlayout control is of type ViewportLayoutEx and not ViewportLayout. You need to change this at two places in the designer file of your form.


  • I cannot find where to change the viewportlayout control in the designer form.  Is there some reference I am looking for?

    R Race

  • You have to go to the ‘Code’ section of the designer. In the solution explorer you can right-click your Form and select ‘View Code’. Or you can expand the Form in the solution explorer and edit Form.Designer.cs.


    See attached screenshot.

  • Sorry, I follow you but changing ViewPortLayout() to ViewPortLayoutEx() shows it does not exist.

                this.viewport1 = new devDept.Eyeshot.ViewportLayout(); to             this.viewport1 = new devDept.Eyeshot.ViewportLayoutEx();

  • Hello Robert,

    Check this video, let me know if it's clearer.


  • Thanks, that's better.  BUT, when I loaded the Eyeshot component I do not get the devDept.EyeshotControl or devdept.Geometry in the References.  If I stick them in manually I get an error.

  • Does the attached VS solution work on your end?

  • Ok, got it working.  The example file did not work but setting that up solved my problem.

    When I set up EyeShot I dragged the SingleViewPort into my project.  It did not populate the references with the dlls as required.  If I double clicked on one of the images for the background, then the references were set up correctly.  I could then change the type in the Form Designer and all works well.


    Maybe this will help someone else having the same issue.

    Thanks for your help on this.

  • While I haven't tried any of this yet... In the steps listed at the top of this post, step 4 states:

    4. Change the type of the** viewportLayout1** control from ViewportLayout to ViewportLayoutEx in the Form designer file1

    ... and the associated footnote state_s:_

    1 If you plan to use the ReadAutodesk class this step is not strictly necessary

    The footnote is not overly clear to me in this case.  Does that mean "If you plan to use *only* the ReadAutodesk class (and therefore *not* the WriteAutodesk class), this step is not strictly necessary"?

    I assume that's the intended meaning, but it's not very clear.  Whatever the meaning, I suggest a clarification in the footnote to prevent confusion.


  • We meant that if you need only to import DWG/DXF using the ReadAutodesk class, you don't need the ViewportLayoutEx object at all. In addition, the WriteAutodesk class does not exist.

  • Got it.  So, maybe this small addition would help clarify the point?

    1 If you plan to use the ReadAutodesk class (instead of the ViewportLayoutEx.ReadAutodesk class) this step is not strictly necessary.

  • Hi there!

    I'm just playing around with the trial version. I would need it for my 64bit project. Actually I have problems transferring the ReadDWG sample you offered to 64bit. Could you please as well offer a 64bit project (incl all references)?



  • Alberto, 

    Can you give an example of just using the ReadAutodesk class.




  • Please check the "Import/export" chapter of the documentation.

  • Hello, how I can run solution on "Any CPU" platform?

  • No, sorry. Only Eyeshot 8, with a small trick can do it.

  • Alberto, what a small trick? Now I'am using 8 version. Please tell me this secret! It is very necessary!

  • You need to check the IntPtr.Size() == 4 to determine if you are on a 32 or 64 bit machine and copy/replace the other necessary DLLs from a x86/x64 folder to your main app folder, then load dynamically the proper Eyeshot x86 or x64 DLL. We will publish an article on this trick soon.


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