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tcorey
Posts: 2,456
Registered: ‎12-18-2002
Message 1 of 10 (319 Views)

Create instance of my object

319 Views, 9 Replies
05-01-2012 04:38 PM

 

 

I have created a class that inherits Polyline. I have added properties to that class.

 

When I try to SetDatabaseDefaults with my object, I get an error "Set database defaults is not a member..."

 

But if I create a new Polyline, SetDatabaseDefaults works for that object.

 

Shouldn't the SetDatabaseDefaults method become a member of my class when I inherit from Polyline?

 

Thanks,

 

Tim

 

 

 

 

 

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
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Alexander.Rivilis
Posts: 1,389
Registered: ‎04-09-2008
Message 2 of 10 (308 Views)

Re: Create instance of my object

05-01-2012 09:50 PM in reply to: tcorey

tcorey wrote:

I have created a class that inherits Polyline...


Is it a .NET class?


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tcorey
Posts: 2,456
Registered: ‎12-18-2002
Message 3 of 10 (288 Views)

Re: Create instance of my object

05-02-2012 08:22 AM in reply to: Alexander.Rivilis

Yes, this is a .Net class.

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
*Expert Elite*
tcorey
Posts: 2,456
Registered: ‎12-18-2002
Message 4 of 10 (285 Views)

Re: Create instance of my object

05-02-2012 08:30 AM in reply to: tcorey

I figured it out.

 

I had originally inherited from Autodesk.AutoCAD.GraphicsInterface.Polyline, but if I inherit from Autodesk.AutoCAD.DatabaseServices.Polyline instead, the object will setdatabasedefaults.

 

I don't know why one polyline would have different properties than another, but I'm not gonna let myself get hung up on that detail right now!

 

So, advice for other newbies, there might be multiple Autodesk-supplied classes in various Autodesk libraries. Those classes might use the same name but not have the same properties and methods.

 

Thanks, Alexander, for responding. I'm sure you'll be seeing more beginner-level posts from me....

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
Moderator
Alexander.Rivilis
Posts: 1,389
Registered: ‎04-09-2008
Message 5 of 10 (277 Views)

Re: Create instance of my object

05-02-2012 02:56 PM in reply to: tcorey

As I understand you try to create custom entity with help of .NET API. Am I right? It is impossible to create custom entity with help of .NET API. It is possible only with help of ObjectARX (C++). Therefore no sense to create classes inherited from DBObject / Entity, as an instance of this class will not be able to create and add to the dwg-file.


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tcorey
Posts: 2,456
Registered: ‎12-18-2002
Message 6 of 10 (257 Views)

Re: Create instance of my object

05-04-2012 01:24 AM in reply to: Alexander.Rivilis

Wow. Thanks, Alexander. You just saved me a bunch of hours.

 

The reason I was going to create my own class was so I could apply properties to a polyline-like object, like you would with Xdata through Visual LISP. Is there a way to apply custom properties to an AutoCAD object using VB.NET, without creating my own class?

 

Or should I just switch to C++?

 

 

 

 

 

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
Moderator
Alexander.Rivilis
Posts: 1,389
Registered: ‎04-09-2008
Message 7 of 10 (256 Views)

Re: Create instance of my object

05-04-2012 01:46 AM in reply to: tcorey

tcorey wrote:

Is there a way to apply custom properties to an AutoCAD object using VB.NET, without creating my own class?


What do you mean by Custom Property? What do you mean by Custom Property? The property which appears in the Properties pane (OPM)?
Try code of Kean Walmsley: http://through-the-interface.typepad.com/through_the_interface/2009/05/modifying-an-autocad-objects-...


tcorey wrote:

Or should I just switch to C++?


Only if you ready to create own custom entity. This is not the easy way. Good luck!


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tcorey
Posts: 2,456
Registered: ‎12-18-2002
Message 8 of 10 (239 Views)

Re: Create instance of my object

05-04-2012 02:22 PM in reply to: tcorey

By Custom Properties, I mean my own properties and values assigned to a polyline object. In particular, I want to create a property that holds the View to which my polyline is associated. Using Visual LISP, I would create Xdata to do this.

 

I read through Kean's post and it appears that there is a way to do this with vb.net, so I might continue down that road for now. Or not. Maybe I'll switch to c++, although it's been even longer since I used it than it has been for VB.

 

Decisions, decisions....

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
*Expert Elite*
_gile
Posts: 2,072
Registered: ‎04-29-2006
Message 9 of 10 (223 Views)

Re: Create instance of my object

05-05-2012 05:13 AM in reply to: tcorey

>> Using Visual LISP, I would create Xdata to do this.

 

Using .NET, you also can create Xdata or ExtensionDictionary/Xrecord,this would certainly be simpler than the objectARX/C++ route...

Gilles Chanteau
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tcorey
Posts: 2,456
Registered: ‎12-18-2002
Message 10 of 10 (204 Views)

Re: Create instance of my object

05-08-2012 10:52 AM in reply to: tcorey

Thanks!

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller

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