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struct __db { /* .. */ DB_ENV *dbenv; /* Backing environment */ DBTYPE type; /* DB access method type */ /* .. */ int (*close) __P((DB *, u_int32_t)); int (*cursor) __P((DB *, DB_TXN *, DBC **, u_int32_t)); int (*del) __P((DB *, DB_TXN *, DBT *, u_int32_t)); // .. } It was impossible to access directly from the PInvoke interface until NET 20 because function pointers in managed structures were impossible to describe With version 2 of the runtime, the SystemRuntimeInteropServicesMarshal class features the GetFunctionPointerForDelegate for obtaining a pointer to a function that invokes a given delegate The caller of the function has to guarantee that the delegate object will remain alive for the lifetime of the structure, since stubs generated by the runtime are not moved by the garbage collector but can still be collected.

the picture, and several COM components are implemented using the CLR. Whenever a reference to mscoree.dll appears in the InprocServer32 registry key, the .NET runtime is used to deliver the COM services using the specified assembly. Through COM interfaces, native and .NET components can be composed seamlessly, leading to very complex interactions between managed and unmanaged worlds. Microsoft Word 2010, for instance, returns a .NET object instead than a COM wrapper, which provides access to Word services without the need for explicit use of reflection.

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Belussi, A. , E. Bertino, and B. Catania. 1998. An Extended Algebra for Constraint Databases. IEEE Transactions on Knowledge and Data Engineering 10(5): 686 705. Date, C. J. and H. Darwen. 2000. Foundation for Future Database Systems: The Third Manifesto. Reading, MA: Addison-Wesley. Date, C. J. 2001. The Database Relational Model: A Retrospective Review and Analysis. Reading, MA: Addison-Wesley. Elmasri, R. and S. B. Navathe. 2003. Fundamentals of Database Systems, 4th ed. Boston: Addison-Wesley. Franklin, M. J. , B. T. Jonsson, and D. Kossmann. 1996. Performance Tradeoffs for Client-Server Query Processing. Proceedings of the 1996 ACM SIGMOD International Conference on Management of Data, Montreal, Canada, 149 160. Gassner, P., G. M. Lohman, K. B. Schiefer, and Y. Wang. 1993. Query Optimization in the IBM DB2 Family. Bulletin of the Technical Committee on Data Engineering 16(4): 4 17. Ioannidis, Y. E., R. T. Ng, K. Shim, and T. Sellis. 1997. Parametric Query Optimization. VLDB Journal 6:132 151. Kossman, D. and K. Stocker. 2000. Iterative Dynamic Programming: A New Class of Query Optimization Algorithms. ACM Transactions on Database Systems 25(1): 43 82. Lee, C., C. Shih, and Y. Chen. 2001. A Graph-Theoretic Model for Optimizing Queries Involving Methods. VLDB Journal 9: 327 343. Selinger, P. G., M. M. Astraham, D. D. Chamberlin, R. A. Lories, and T. G. Price. 1979. Access Path Selection in a Relational Database Management System. Proceedings of the ACM SIGMOD International Conference on the Management of Data, Aberdeen, Scotland, 23 34. Stonebraker, M., E. Wong, P. Kreps. 1976. The Design and Implementation of INGRES. ACM Transactions on Database Systems 1(3): 189 222.

Furthermore, there is the problem that callbacks must adopt the stdcall calling convention in order, and if this is not the case, the PInvoke interface cannot interact with the library When the expressivity of PInvoke is not enough for wrapping a function call, it is still possible to write an adapter library in a native language such as C This was the approach followed by the BDB# library where an intermediate layer of code has been developed to make the interface to the library compatible with PInvoke The trick has been, in this case, to define a function for each database function, taking as input the pointer to the structure and performing the appropriate call: DB *db; // BDB call db->close(db, 0); // Wrapper call db_close(db, 0); The problem with wrappers is that they have to be maintained manually, when the signatures of the original library change.

How can the runtime interact with COM components The basic approach is based on the COM callable wrapper (CCW) and the runtime callable wrapper (RCW), as shown in Figure 17-3. The former is a chunk of memory dynamically generated with a layout compatible with the one expected from COM components, so that external programs even legacy Visual Basic 6 applications can access services implemented as managed components. The latter is more common and creates a .NET type dealing with the COM component, taking care of all the interoperability issues. It s worth noting that although the CCW can always be generated because the .NET runtime has full knowledge about assemblies, the opposite isn t always possible. Without IDispatch or type libraries, there is no description of a COM component at runtime. Moreover, if a component uses custom marshalling, it can t be wrapped by an RCW. Fortunately, for the majority of COM components, it s possible to generate an RCW.

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