How can I access a Rhino plugin's dock panel in a Grasshopper plugin

Rhino Developer
, ,
1

first asked here but reposting for appropriate category

a rhino Plugin containing the following

using System;
using Eto.Forms;
using Rhino.UI;
using Rhino.PlugIns;
using System.Runtime.InteropServices;

namespace SomePlugin
{
    public class MyRHPlugin: Plugin
    {
        public MyRHPlugin() { Instance = this; }
        public static MyRHPlugin Instance { get; private set; }
        public UserPanel MyPanel {get; set;}
    }

    [Guid("1234")] // random guid here. no problem
    public class UserPanel: Panel
    {
        public UserPanel(){ }
        public static Guid PID
        {
            get { return typeof(UserPanel).GUID; }
        }
    }
}

and in a separate Grasshopper plugin I have this

// abbreviated code above...
protected override void SolveInstance(IGH_DataAccess DA)
{
    // DA gets all inputs...abbreviated
    Guid id = new Guid("9876"); // correct id for the plugin
    
    if (!PlugIn.GetPlugInInfo(id).IsLoaded) { return; }
    
    MyRHPlugin myplugin = PlugIn.Find(id) as MyRHPlugin;
    DA.SetData(0, myplugin.MyPanel.ToString()); // this line is where debugger encounters error
}

when this runs, i encounter a null reference error. it says the getter returns null.
how can i access that panel in my GH plugin? like reading textboxes

I’ve omitted the loading part. that part works. the panel shows correctly in rhino

2

Do you assign the loaded panel object to the property MyPanel?

2 Likes
3

You can subscribe to the panel load event to assign the MyPanel like: MyRHPlugin.Instance.MyPanel = this; and it will happens when you open the panel somehow.

1 Like
4

I was wondering where it’d be instantiated. I thought Rhino took care of that.
Thanks guys. Working now.