Local Fortran variable changes mid process while calling C# DLL

[MatchID_Ash]

I have a C# dll which contains APIs to communicate with our company apps. I have created an additional static library in C++ CLI to consume these APIs through languages like native C++ and Fortran. The library works well with native C++ and most times with Fortran. However, some values change randomly over time in the Fortran code while running.  The values being exchanged are validated to be correct. The problem is with local Fortran variables. They change over course of execution.

[jimdempseyatthecove · Accepted solution]

Try: __declspec(dllexport) extern "C" double GetValue(...

Jim Dempsey

[jimdempseyatthecove]

Also, Fortran does not support Structured Exception Handling. Thus the Fortran->C++ wrapper function should be compiled without SEH (though it can use SEH features).

Jim Dempsey

[MatchID_Ash]

Thank you Jim. The calling convention was the issue as you pointed out.