Execute python function from .Net plugin

.Net Add-on Programming
1

Hello! I recently started developing a simple .net plugin for visual components. The plugin gets information from a database, then passes this information to visual components by writing it to the output. This works, but it doesn’t feel like the best solution. Is it possible to somehow call a python function from a .net plugin? If so, how do i do this? Is there some documentation i’m missing?

Kind regards.

 

2

In a Python script, you can use vcApplication.findCommand(“netCommand”) to get a handle for the netCommand, which can be used to call a .NET command registered with the VC product.

Here is a tutorial for how to do that.

http://academy.visualcomponents.com/lessons/register-a-command/?course=135

3

Thanks for the quick reply! But it really doesn’t answer my question. I know that i can use findCommand to get a handle for a command declared in my .Net plugin, but i want to get a handle to a python function declared in one of my models. Is this even possible?

4

Ah, sorry. I misread. No, you cannot get a handle for a function in a script. You can, however, make the function a Python command can call it in .NET or bind the function to a component property’s OnChanged event, so whenever you change the value of the property you know that function will be called.

5

Yeah, using a components property seems to be the best solution for me.

Thanks for the help, really appreciate it.

6

No problem, and the Add-ons course has a lesson that shows how to do that. Another thread that might interest you

https://forum.visualcomponents.com/forums/topic/tcp-ip-two-way-communication/

7

One more question! How do you set the value of a string property from the plugin?

I can obtain a reference to the IProperty in my component, but how do you dynamically set a value on said property? I’ve tried createAndSetNewValue, but I get the exception “System.NotSupportedException: ‘Specified method is not supported.’”

8

If you are working with .NET language and .NET API, an IProperty or IProperty<T> object has a Value property, which is a getter and setter. So use that to set the value of a component property.

createAndSetNewValue… VC .NET API uses Pascal case for its naming convention, so it’s CreateAndSetNewValue.

9

Hi! Sorry for being unclear, I meant CreateAndSetNewValue. Forgot to capitalize create.

I’ve tried to set the Value of my IProperty with a string value, but i got an access violation exception.

10

I do not know what you are doing then. If I want to set the value of the Name property, for example, I could do this using both IProperty and IProperty<T>.

        public void ChangeName()
        {
            if (app.World.Components.Count > 0)
            {
                ISimComponent _comp = app.World.Components[0];
                _comp.Name = "Example";
                IProperty _prop = _comp.GetProperty("Name");
                _prop.Value = "Another Example";
                IProperty<string> _propT = (IProperty<string>)_comp.GetProperty("Name");
                _propT.Value = "Last Example";
            }
            
        }

Edit: If I had to guess, I would think you were not getting the property object first, and then setting the value.

11

Dear MY Friends，

I am a primary user of Visual Components, could you please instruct me how to connect VC with database? If possible, could you help me record a simple teaching video. Thanks a lot！

Best Wishes.

12

Depends on the database, but try this
https://github.com/mkleehammer/pyodbc/wiki/Getting-started

I have used SQLite module with VC, but I don’t have access to those scripts atm.

13

Hi zesty，

The database I use is SQL Server. The webpage link you sent me is the method that Visual Components connects with SQL Server.

14

How to create behaviors in .NET?

15

Hy,

image

Regards
Feature

16
  • Thank you. I succeeded. Thank you!
17

You’re welcome

Regards Feature

18

Hello Zesty,

How can I define a Python Command that is callable from a .Net plugin? The other way around is well explained in the lessons.
I have a piece of code in python that I don’t want to translate into C# to include it into my current project.

Thanks a lot!

19

For anybody who is interested. I found a solution on my own. To search for python commands you have to use IApplication Interface, not ICommandRegistry:

IApplication app = IoC.Get<IApplication>();
IPythonCommand pythonCommand = app.FindPythonCommand("TestCMD");  <-- Name of your command defined in __init__.py file: cmd = loadCommand("TestCMD", cmduri)
pythonCommand.Execute();

If there is another, more elegant way to access python code from .net, I would be happy to hear about them. :slight_smile:

20

@joshua_beck I was just about to respond. Does this help? You can use ExecuteCommand2() method as well as the others in the image. However, ExecuteCommandMethod() has a funky third parameter that requires Matrix[] object, so I recommend using ExecutePythonCommandMethod().

image
image2054×419 80.5 KB

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