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barnesd
Posts: 1
Registered: ‎06-14-2006
Message 1 of 4 (149 Views)

Getting AutoCAD Object

149 Views, 3 Replies
06-14-2006 03:27 AM
I have a piece of code which creates Layers in AutoCAD from an external .NET application.

I use the line GetObject(, "AutoCAD.Application"). The code uses try catch statement to check it has the right object for example. I use AutoCAD.Application for version 2002 and then AutoCAD.Application.15 for the next version and so on.

This has worked until I have run my code with AutoCAD 2007 running. It selects AutoCAD.Application as the running version but when it try's to set it to the object I get an error saying specified cast is not valid.

Does anybody have any ideas.

Thanks
Valued Contributor
smcclure
Posts: 60
Registered: ‎06-08-2006
Message 2 of 4 (149 Views)

Re: Getting AutoCAD Object

06-14-2006 08:45 AM in reply to: barnesd
If you are developing a .NET application, you should be able to use Autodesk.ApplicationServices.Application.AcadApplication to retrieve the COM AcadApplication object.

- Scott
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DotNetDude
Posts: 113
Registered: ‎10-14-2006
Message 3 of 4 (149 Views)

Re: Getting AutoCAD Object

10-14-2006 04:38 PM in reply to: barnesd
edited...
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cgay
Posts: 125
Registered: ‎08-02-2005
Message 4 of 4 (149 Views)

Re: Getting AutoCAD Object

10-16-2006 10:21 AM in reply to: barnesd
The class "AutoCAD.Application" is usually set to the last installed version of AutoCAD on any specific system. In your case, you should always use the specific class name for the COM object you are trying to get a reference to. I.E.
"AutoCAD.Application.15" for AutoCAD 2002
"AutoCAD.Application.16" for AutoCAD 2004
"AutoCAD.Application.16.1" for AutoCAD 2005
"AutoCAD.Application.16.2" for AutoCAD 2006
not sure of 2007 though, I don't have it installed right now but it'll be either "AutoCAD.Application.16.3" or "AutoCAD.Application.17"


Again, if you only use "AutoCAD.Application", you will get a reference to whichever version of AutoCAD is registered under that class (which is usually the version which was installed last).
You can check this in the registry (use all appropriate caution when accessing the registry though). It will be under HKEY_CLASSES_ROOT.
Look in the CLSID subkey at the (Default) property. The data will contain the CLSID of the currently registered version, Match that against the CLSID(Default) of the AutoCAD.Application.XXX to find which is current.

C
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