Error load plugin in Matlab

[Vinh Nguyen]

Hi,

Sorry for bringing a old topic.
I am trying to build the tutorial of plugin an Analysis tool and CoupledBushingForce provided by OpenSim.
I am able to use them in OpenSim GUI. But they does not work in Matlab.
Although I have read some other related posts:
viewtopicPhpbb.php?f=91&t=3942&p=8878&h ... tlab#p8878
viewtopicPhpbb.php?f=91&t=5974&p=15163&start=0&view=
http://simtk-confluence.stanford.edu:80 ... ng+Plugins

I am still not able to get it works.
When I used loadlibrary(pathDLL, pathHeader), the error I got for the Analysis plugin is:
"...C:\OpenSim 3.3\sdk\include\OpenSim\Simulation\Model\Analysis.h(32) : fatal error C1083: Cannot open include file:
'OpenSim/Simulation/osimSimulationDLL.h': No such file or directory"

the error with CoupledBushingForce is:
"...C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\INCLUDE\eh.h(27) : fatal error C1189: #error : "eh.h is only for
C++!""

I also tried to used Model.LoadOpenSimLibrary(pathtoDLL), although this command runs without showing error, when I try to use the plugin class (eg. force = CoupledBushingForce(); ), it shows "Undefined function or variable 'CoupledBushingForce'."

I have tried to create a simple dll function, and load in Matlab, and it works well
(http://stackoverflow.com/questions/1841 ... and-matlab)
I wonder is there any differences between creating a dll which is a class and dll which is a function.

Thank you for reading my long post.

Vinh

[Thomas Uchida]

The C1083 error ("Cannot open include file: 'OpenSim/Simulation/osimSimulationDLL.h': No such file or directory") points to one problem. Have you added the directory containing the plugin to the "librarypath" in Matlab? See http://simtk-confluence.stanford.edu:80 ... ng+Plugins, point 2 under the "Matlab" heading.

As Ayman explained here viewtopicPhpbb.php?f=91&t=5974&p=15163, you will not be able to create an instance of CoupledBushingForce in Matlab.

[Vinh Nguyen]

Thank you very much for your response, Tom.

I had added directory containing the plugin to the "librarypath".

For the CoupledBushingForce, if I have OpenSim source code, add the CoupledBushingForce into Actuator folder, use CMake to create the solution and then build the OpenSim. Do you think this way will work?

[Thomas Uchida]

if I have OpenSim source code, add the CoupledBushingForce into Actuator folder, use CMake to create the solution and then build the OpenSim. Do you think this way will work?

You would also need to register the object using Object::registerType() (see OpenSim/Simulation/RegisterTypes_osimSimulation.cpp) and may need to modify the SWIG bindings to Java. You could try, but it might not be so straightforward.

[Vinh Nguyen]

I will try and let you know if it works.
Thanks again.

[Vinh Nguyen]

Well, it does not work because OpenSim 3.3 source zip does not contain file for working with Matlab.
http://simtk-confluence.stanford.edu:80 ... rom+Source

Come back to the issue of using plugin with Matlab, my concern is what kind of plugin class that can be used in Matlab?
And if I cannot create a new instance of plugin, could Matlab realize the plugin class by reading a .osim model that uses the plugin class?

Thanks,

Vinh

[Thomas Uchida]

Have you tried using Model.LoadOpenSimLibrary()? See viewtopicPhpbb.php?f=91&t=6387.

[Vinh Nguyen]

Thank you Tom, I just figured out I always tried to create a new instance of plugin when I tested using Model.LoadOpenSimLibrary() command. That is why I got error. I loaded a .osim file that uses the plugin and try to read, modify it. It works perfectly now!
I think that would be good if I summarize some notes about using plugin with Matlab which I learned here. This may help others quickly get their plugins worked.(My OpenSim version is 3.3)

1. Instructions for setup
http://simtk-confluence.stanford.edu:80 ... ng+Plugins
2. You will not be able to create a new instance of plugin in scripting with Matlab
viewtopicPhpbb.php?f=91&t=5974&p=15163
What you can do is to create a model that already had the plugin, then you can modify and use it.
3. To load the plugin into Matlab, you can use command loadlibrary() or Model.LoadOpenSimLibrary(‘pathtoDLLfile’). I never succeed using loadlibrary(). Using Model.LoadOpenSimLibrary() is much easier.
viewtopicPhpbb.php?f=91&t=6387
4. OpenSim build from source code does not contain the files for working with Matlab.
http://simtk-confluence.stanford.edu:80 ... rom+Source
5. Other related posts:
viewtopicPhpbb.php?f=91&t=3942
viewtopicPhpbb.php?f=91&t=4904&p=11969& ... ary#p11969
viewtopicPhpbb.php?f=91&t=6333&p=16191&start=0&view

Thanks!