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I am attempting to connect to SolidWorks via this code:

Dim swApp As SolidWorks.Interop.sldworks.ISldWorks = _
    TryCast(System.Runtime.InteropServices.Marshal.GetActiveObject("SldWorks.Application.34"), SolidWorks.Interop.sldworks.ISldWorks)

The connection works just fine and dandy when everything is fresh. It seems that if SolidWorks has been open overnight, this call fails with this exception:

Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE))

If I restart SolidWorks, everything begins working as expected.

Any ideas why this is throwing an error?

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  • GetActiveObject uses COM's Running Object Table (ROT). Next time you get the MK_E_UNAVAILABLE error, use a tool (like these) to view the contents of the ROT, which should help you identify the problem. Commented Oct 1 at 0:37
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