What is the difference between a COM server written solely in C++ (no IDL) and using C++ and IDL?

COM server can be written using C/C++ with no IDL. However these COM server will have several limitations.

  • Only client written with C/C++ language will be able to use the server.
  • This server will be compiled as DLL and will work only as in-proc server.
  • This server cannot work as DCOM EXE or DCOM which works over different network hosts.
  • VB/VB Script /Javascript will be able to use this server if IDispath interface is implemented.

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