MIDL and COM
All COM objects implement one or more interfaces. When you create a custom COM object, you must describe the interface or interfaces in an IDL file. The topics in this section present information on using MIDL to define COM interfaces:
For more information on defining COM interfaces with MIDL, see Defining COM Interfaces. For more information on building generated files for various platforms, see Targeting Stubs for Specific 32-bit or 64-bit Platforms.