Set user text using C# component

Grasshopper
1

Hi, I’m getting a wierd error using the Elefront component, so I’m trying to use the C# component instead just to update user text on some referenced curve objects. Here’s the code inside the C# component, and it doesn’t seem to be working. I get neither of the error messages I’ve coded, but the attributes don’t update.

private void RunScript(bool act, Curve crv, List<string> keys, List<string> values)
  {
    if(act){
      if (keys.Count != values.Count) {
        Print("Number of keys must equal number values.");
        return;
      }
      for(int i = 0; i < keys.Count; i++) {
        if(!crv.SetUserString(keys[i], values[i])){
          Print("User text update failed.");
          return;
        }
      }
    }
  }
2

This metadata can be added to various places, the geometry itself, its document attributes associated with a geometry, or its RhinoObject… You’re probably assigning it, but the method you use to check it looks in another one of these places. Maybe that is your problem.

3

Dani, thanks for the reply. The method I’m using to check it is simply Rhino’s built-in “Attributes User Text” pane of the Properties panel.

4

I’m not quite sure because your question is quite ambiguous, but I guess you have to take the Rhino object reference and assign the metadata to its attributes, rather than directly to the geometry as that script does.
https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_DocObjects_ObjectAttributes_SetUserString.htm

1 Like
5

Good point, thanks! The following code worked. I don’t know if I’m using best practices to get to the ObjectAttributes from a piece of referenced geometry, but it does work. Now if I could just get the operation to register in the Undo stack, like the Elefront component does …
Thanks!
Carl

  private void RunScript(bool act, Guid guid, List<string> keys, List<string> values)
  {
    if(act){
      if (keys.Count != values.Count) {
        Print("Number of keys must equal number values.");
        return;
      }
      var obj = doc.Objects.Find(guid);
      if(obj != null){
        for(int i = 0; i < keys.Count; i++) {
          if(!obj.Attributes.SetUserString(keys[i], values[i])){
            Print("User text update failed.");
            return;
          }
        }
      }
    }
  }
6