Error when using custom parameter class

Replies to This Discussion

Permalink Reply by Ranjeeth Mahankali on March 6, 2017 at 10:53am

Ok, It keeps happening when I use the IGH_VariableParameterComponent. Can I not use my custom parameter class and implement that interface ? am I missing something ?

Permalink Reply by David Rutten on March 7, 2017 at 6:58am

I cannot repeat that. If I stick your parameter code into a project it reads out just fine. I think the problem may be in your component instead. Care to post that code?

Permalink Reply by Ranjeeth Mahankali on March 7, 2017 at 3:48pm

Hi ! thanks, I just saw the reply... here is the component in which I am using. Everything works fine if I don't implement the IGH_VariableParameter. But I need to implement that interface. Thanks again !!

Attachments:

• component.cs, 9 KB

Permalink Reply by David Rutten on March 7, 2017 at 4:29pm

I don't have the geomObject, memberInput and memberSelect classes needed to compile that. Maybe it's a good idea to simplify this as much as possible. If it starts working start adding complexity back until it fails, if it still doesn't work in the simplest form then it should at least be easy to pinpoint the problem.

Looking at the code there's a lot of stuff I wouldn't do, but that doesn't mean it's wrong. It just makes it difficult for me to parse the code without running it.

Permalink Reply by Ranjeeth Mahankali on March 7, 2017 at 5:16pm

I did simplify it and then added things one by one, It breaks exactly when I implement IGH_VariableParameterComponent Interface. Until that point everything works as expected. Is there anything special that is making IGH_VariableParameterComponent and my parameter class not work together ? 

The error only happens when I open saved files, but otherwise the component works as expected. And attached files all the classes. Thanks for the help !

Attachments:

• dataTypes.cs, 9 KB
• ObjectifyComponent.cs, 20 KB

Permalink Reply by Ranjeeth Mahankali on March 7, 2017 at 5:19pm

memberInput is the parameter class and I am trying to use it in the ObjectifyComponent, which also implements IGH_VariableParameterComponent.

Permalink Reply by Ranjeeth Mahankali on March 18, 2017 at 5:34pm

Hi,

In this file (attached) I am using this parameter in a basic component without using any other classes, it still shows the same error whenever I open a saved file which uses this component. The error occurs as soon as I use my custom parameter class along with the IGH_VariableParameterComponent interface.

I am not able to figure out what is causing that error, can you help ? Thank you very much !

Attachments:

• testComp.cs, 6 KB

Permalink Reply by David Rutten on March 18, 2017 at 6:16pm

Sorry I missed your previous response. Don't know what happened.

I'll try and have a look at your latest code tomorrow morning.

Permalink Reply by David Rutten on March 19, 2017 at 11:06am

The problem (well, the one that jumps out at me) is that your parameter class doesn't have a constructor without arguments. The only constructor you provide requires a string. Because of this Grasshopper doesn't understand how to instantiate this parameter when it needs one during file reading.

Permalink Reply by Ranjeeth Mahankali on March 19, 2017 at 11:24am

Thank you so much ! the constructor totally fixed it !!

Permalink Reply by David Rutten on March 19, 2017 at 11:40am

See the attached code and file. I implemented proper deserialization for your parameter type, type instantiation and also removed everything that wasn't essential to this example.

Attachments:

• OptionParameterTestCode.cs, 7 KB
• option parameter.gh, 13 KB

Permalink Reply by David Rutten on March 19, 2017 at 11:42am

Oops, line 154 should be:

sb.AppendLine(string.Format("  {0}: {1}", k, list[k].ToString()));

instead of:

sb.AppendLine(string.Format("  {0}: {1}", k, list[i].ToString()));

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