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The OpenMI standard was designed to allow easy migration of existing model engines. The
standard is implemented in C# running under the .NET framework. Almost all existing model
engines are implemented in other programming languages, such as Fortran, Pascal, C and
C++. In order to bridge the gap between the different technologies and to minimize the
amount of changes needed to be made to the engine core a wrapping pattern will be the most
attractive choice in most cases.
This chapter describes the process of wrapping and the generic wrapper that is provided by
the OpenMI Software Development Kit (SDK).

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  • The MyEngineDLL is the compiled core engine code (compiled dll from e.g. Fortran).
  • The MyEngineDLLAccess class is responsible for translating the Win32Api from MyEngineDLL to .NET (C#).
  • Calling conventions and exception handling are different for .NET and Fortran. The MyEngineDotNetAccess class ensures that these operations follow the .NET conventions.
  • The MyEngineWrapper class implements the IEngine interface, which means that it can be accessed by the LinkableEngine class.
  • The MyLinkableEngine class is responsible for the creation of the MyEngineWrapper class and for assigning a reference to this class to a protected field variable in the LinkableEngine class, thus enabling this class to access the MyEngineWrapper class. The MyLinkableEngine class implement the OpenMI.Standard.IlinkableComponent interface and therefor is the LinkableComponent (the OpenMI compliant component).

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