Issue in finalizing connections

[Andrea Braschi]

Hi all,

I have been trying to implement some custom classes using the cpp API. As a starting point, I am trying to do the "build_simple_arm_model.py" example in cpp.

I was having some issue with adding components (ie bodies, joints, etc.) to the model, but I solved those using the advice that I found in this thread: viewtopicPhpbb.php?f=91&t=13858&p=39858&start=0&view=.
More specifically, I now build with "RelWithDebInfo".

My code now can successfully construct all the model components and add them to the model, such as

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model.addController(controller);

However it fails to finally finalize the connections when doing

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model.finalizeConnections();

Here is the the error description that I get when debugging:

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Microsoft C++ exception: OpenSim::ConnecteeNotSpecified at memory location 0x0000007F388FE3B0.
Microsoft C++ exception: OpenSim::Exception at memory location 0x0000007F388FE7E0.
Microsoft C++ exception: OpenSim::Exception at memory location 0x0000007F388FE7E0.

Probably it's worth mentioning that I am using OpenSim 4.4 and Visual Studio 17 2022.

I hope the error description is enough to roughly understand where the issue may come from. Happy to provide more detail on the code if needed!

Many thanks in advance.

Andrea

[Thomas Uchida]

The "build_simple_arm_model.py" example is similar to the "OpenSim API Example" here (with C++, Python, and Matlab versions): https://github.com/opensim-org/opensim- ... PI-Example.

[Andrea Braschi]

Hi Tom,

many thanks for sharing the API example.

The example is very similar to the code I had written. I implemented the differences that were there, hoping that I made a mistake, but I get the same error:

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OpenSim::ConnecteeNotSpecified

Maybe it's related to how I built the environment?

All the best,
Andrea

[Thomas Uchida]

Perhaps the VS debugger can help identify the issue? Please see https://learn.microsoft.com/en-us/answe ... -exception.