custom type in Simulink S-Function internal state

Hi all,

What's the correct way to keep an internal reference to an object inside a Simulink Matlab level 2 S-Function. Buitins block.Dwork and block.ContState only support data types, I need to keep a reference to a network object tcp/udp and the following code fails:

block.Dwork(1).Data = tcpip('localhost',1234);

with message:

Invalid assignment in 'test/test'. Data must be a numeric or logical array

Looking at the documentation, I see no way to keep this reference in a "clean" way. The page http://www.mathworks.fr/fr/help/simulink/sfg/custom-data-types.html is about defining types for inputs/outputs and I understand limitations for signals entering and leaving the block. My case is a little bit different: this internal object should be kept during simulation but it is not intended to leak from the Simulink block.

Any help?

TIA

- Florent

Answer 1

[Florent]

Half-self-answer: I managed to get this block run by the creation of a global list of objects. The simulink blocks just keep a reference (index as a scalar value) to these objects in their own state space.

[Simon]

Can you post a code snippet? I'm trying to solve a similar problem.