How to use a dll file in Simulink/Simscape using S-functions?

Question

Laurenzo Blonda 2021-5-6

0
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https://ww2.mathworks.cn/matlabcentral/answers/822805-how-to-use-a-dll-file-in-simulink-simscape-using-s-functions

回答： Oliver Jaehrig 2021-5-6

In order to share a Simulink/Simscape model with a third party I generated a shared library/ dll-file from this model. I assume this provides a safe way to share a protected model. However to test if the dll-file works, I want to make sure that I myself can run the dll file again in Simulink. I understand that S-function blocks are used to do this, however I don't know how to do this for dll-files (in contrast to mex files, which can be simply added to the S-function block).

Online I found quite some help on this, however I'm not familiar with C-code and didn't understand the answers there.

Such as online help 1, online help 2, online help 3

So my question comes down to:

What are the steps I need to take to use a dll file in a s-function block?
Do I need to write c-code supporting files for this to work?
Can S-functions work with Simscape blocks?
I want to share this dll as a protected file ( to keep the third party from knowing what's inside the model). Is this possible with dll-files? I know 'protected models' cannot be used because of the fact that I use Simscape ports at the root level of my model.

Regarding info on the model: the model contains several simulink in/output ports as wel as Simscape in/output ports. The logic inside will only contain basic simulink/simscape blocks.