Grasshopper

algorithmic modeling for Rhino

Implement .dll (VB.NET) in GH Python

I tried to implement a self written .dll (VB.NET) in Grasshopper Python and got following error.

Runtime error (ArgumentTypeException): HelloWorld() takes exactly 1 argument (0 given)

 

In my mind the HelloWorld function should need no argument but return the string “Hello World”.

Help on method-descriptor HelloWorld

 |  HelloWorld(...)

 |          HelloWorld(self: MyClassLibrary) -> str

 

Can anybody help?

  

Sourcecode MyClassLibrary.vb:

  • Simple Class Library Project in Visual Studio 2015

  • Function has no parameters and Returns String „Hello World“

  • Compiled *.dll works fine in other Visual Studio Projects as reference

Project Properties

Checkbox „COM Interop“ has no impact

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Replies to This Discussion

Permalink Reply by Giulio Piacentino on June 7, 2017 at 10:42am

Hi Clemens,

that function (in VB) is not static, so it's an instance method.

In turn, instance methods need a "self" instance in Python. You need to first instantiate MyClassLibrary() by calling its constructor...

ghw_instance = ghw()

#then
ghw_instance.HelloWorld()


Alternatively, you could mark the method as static.

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Permalink Reply by Clemens Huber on June 8, 2017 at 12:30am

Hi Giulio,

thanks for your quick answer and help! Now the method works.

Clemens

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