topic Re: Access .NET from the COM application object? in .NET Forum

Access .NET from the COM application object?

Anonymous — Thu, 24 Nov 2011 13:54:29 GMT

Does anyone know if it is possible to access .NET from the COM application object?

I have a stand alone application that accesses the Autodesk.AutoCAD.Interop.AcadApplication object and uses it for various functions.

What I would like to do is to access objects in the .NET namespaces Autodesk.AutoCAD.Runtime, Autodesk.AutoCAD,Applicationservices, Autodesk.AutoCAD.Editorinput etc. via the COM-application object.

Is that possible?

Regards

Jan Grenov

Re: Access .NET from the COM application object?

augusto.goncalves — Thu, 24 Nov 2011 13:57:53 GMT

Hi Jan,

No you cannot. The namespaces available under AcMgd and AcDbMgd are for in-process only, meaning just for plug-ins (not external applications).

The alternative is expose what you need to an outside caller using the approach suggested here:

http://through-the-interface.typepad.com/through_the_interface/2009/05/interfacing-an-external-com-application-with-a-net-module-in-process-to-autocad-redux.html

Hope this explains.

Augusto Goncalve

Autodesk Developer Network

Re: Access .NET from the COM application object?

Anonymous — Fri, 25 Nov 2011 07:41:32 GMT

Hi Augusto

OK. Thanks a lot for your answer. I'll study the alternative that you proposed.

Re: Access .NET from the COM application object?

Anonymous — Tue, 29 Nov 2011 18:17:46 GMT

I know you have an answer.

I looked at the answer, but it was beyond me.

Perhaps I can give you another solution, which I think is easier to understand and depends on some very basic code.

Insert a timer in your external application, the sole function of which is to poll for the existance of a file.

Decide what data you wish to have in this file.

Read the file and then delete it.

In your Inprocess class, write data to this file.

Experiment with the timing of your timer.

I have found it can be very quick.

Re: Access .NET from the COM application object?

Anonymous — Wed, 30 Nov 2011 06:42:08 GMT

Not a bad idea.

Thanks for sharing it 🙂

Re: Access .NET from the COM application object?

Hallex — Wed, 30 Nov 2011 15:31:04 GMT

I have not tried to use Timer

Can you share a simple code with

TIA

Re: Access .NET from the COM application object?

Anonymous — Wed, 30 Nov 2011 16:08:25 GMT

Well this is not really a timer, but it works fine for me:

Dim cnt As Short = 0

Dim AcadIsReady As Boolean

While Not AcadIsReady

Try

If cnt > 10 Then' After ten attempts ...

MsgBox("Send some error message")

Exit Sub

Else

Try to execute your in-process-function here ' This will fail as long as AutoCAD is busy

AcadIsReady = True

End If

Catch ex As Exception

cnt = cnt + 1

System.Threading.Thread.Sleep(1000) ' Sleep for one second

End Try

End While

Re: Access .NET from the COM application object?

Hallex — Wed, 30 Nov 2011 16:55:08 GMT

Thanks a lot

Regards,

Oleg

Re: Access .NET from the COM application object?

Anonymous — Wed, 30 Nov 2011 21:03:23 GMT

I am assuming that you have an exe that needs to read events raised in an inprocess dll (referencing acdbmg)

So instead of raing an event which Im not sure how you might do it, write to a file with a message.

In your app, the timer event simply waits for the File.Exists(yourfilename) to return True. The read it and from its message work out what the event was intended to be.

Re: Access .NET from the COM application object?

Hallex — Thu, 01 Dec 2011 10:22:16 GMT

Thanks for exoalnation

It's clearly enough,

Regards 🙂

~'J'~