simtk.org

Hello. I am attempting to program with the OpenSim C++ API, but there are some problems.

In order to begin compiling, I followed the instructions here:
http://simtk-confluence.stanford.edu:80 ... ep+Example

Using Windows 10, CMake 3.4.3 and Visual Studio 15 I had to make some adjustments in order to compile the TugOfWar1_CreateModel.cpp model. Namely:
* I generated the solution file with Visual Studio 14 2015 as my generator.
* I removed the definitions for the 'signbit' and 'timespec' objects.
* Downloaded a SimTKlapack.lib which seemed to be missing in my OpenSim library.

This allowed me to successfully compile. However, when following the next tutorial, e.g.
http://simtk-confluence.stanford.edu:80 ... n+Part+One
I ran into some trouble. Basically, after I add the block and the joint elements I can still compile the program, but running the executable causes errors:

Unhandled exception at 0x00007FF95CF9E71C (ntdll.dll) in exampleMain.exe: 0xC0000374: A heap has been corrupted (parameters: 0x00007FF95CFF22B0).

I haven't been able to figure what's the problem, and any insights would be appreciated.

Sergio,

The "signbit" issue you mentioned was specific to version 3.2 and is fixed in version 3.3 which was released/built using VisualStudio 2015. What version of the source are you using and where did you download it from?

Thanks,
-Ayman

Thanks for the reply. I did not mention that I was building OpenSim 3.1 (downloaded from this site), so I could work with a particular project (https://simtk.org/home/upexdyn).

After some time I realized that I should be building Simbody from source. After some more time I decided that building 3.1 from source with Windows 10 and Visual Studio 15 would be tricky, so I decided to try something else. I attempted to compile Simbody and OpenSim from source using two configurations:

The first configuration used Windows 8.1, CMake 3.4.3, and VS Express 2010 to compile SimBody 3.1 and OpenSim 3.1 .
The second configuration used Windows 10, CMake 3.4.3, and VS 14 2015 to compile Simbody 3.5.3 and OpenSim 3.3 .

I was able to successfully compile and test the programs for both cases without any gimmicks like the 'signbit' thing.

Next I tried once more the API tutorial: http://simtk-confluence.stanford.edu:80 ... n+Part+One .

I got an error when compiling the example that only creates the OpenSim model. It was the same error for both of my builds:

LINK : fatal error LNK1104: cannot open file 'OpenSim_SimTKcommon.lib'

I noticed that I have the file ../sdk/lib/SimTKcommon.lib, but not OpenSim_SimTKcommon.lib . I seem to recall that I did everything using the "RelWidthDebInfo" and "x64" settings in Visual Studio. Does anyone see what might be causing this error?

When we build OpenSim and Simbody for distribution, we set a Simbody CMake variable called `BUILD_USING_NAMESPACE` to `OpenSim_` to avoid conflicts with other Simbody libraries you may have.

Simply rename `SimTKcommon.lib` etc to `OpenSim_SimTKcommon.lib`, or rebuild Simbody with `BUILD_USING_NAMESPACE` set to `OpenSim_`.

EDIT: The namespace should be `OpenSim`, not `OpenSim_`.

Thanks!
Prepending 'OpenSim_" to the SimTK* files solved the problem.