Using Custom Classes as Input Parameters to a GH Component

has anyone managed to use thir own custom class as an output parameter to a GH component?

I cant seem to do it and GH hangs after the pManage.Regsiter.Param method is called. Im running

0.6.0059.

Some psuedo code to get the ball rolling;

Namespace MyLibrary

Class MyClass

Inherits Grasshopper.Kernel.Types.GH_Goo

End Class

End Namespace

Now in the RegisterOutputParams sub.......................

Protected Overrides Sub RegisterOutputParams(ByVal pManager As GH_OutputParamManager)

Dim ghMyClassParameter As Grasshopper.Kernel.GH_Param(Of MyLibrary.MyClass)

pManager.RegisterParam(ghMyClassParameter, "MyClasses", "MC_P", "MyClass Output Parameters")

End Sub

It fails after execution of the regsiterparam method, i note that ghMyClassParameter has a value of null and have unsuccessfully tried casting from a new instance, say:

Dim myClass As New MyLibrary.MyClass

myClass.CastTo(ghMyClassParameter)

I still get a null instance for ghMyClassParameter

Cheers

Replies to This Discussion

Permalink Reply by Jon Sargent on October 11, 2010 at 3:16pm

Thanks, David. I'm excited to see the new help file. My current work-around is placing the surfaces in a data tree whose paths contain other information (all integers, of course). It's functional for the moment, but limited and hardly elegant.... a good data type will be much, much better.

Permalink Reply by Jon Sargent on December 16, 2011 at 9:21am

David et al.,

Just following up on this now. Quick question: I've made a data type, and now I'm trying to make a parameter for it. After deriving from GH_Param(Of MyType), what is the constructor supposed to look like?

Public Class MyParam
    Inherits GH_Param(Of MyType)

    ' Constructor
    Public Sub New()
        MyBase.New(argument???)
    End Sub

....

End Class

(The SDK shows an example deriving from GH_PersistentParam, but my type is not serializable.)

Thanks,

Jon

Permalink Reply by David Rutten on December 16, 2011 at 11:06am