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how-to-reference-net-types-from-com.md

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How to: Reference .NET Types from COM
Reference .NET types from COM. VB clients can view a .NET object in the object browser, but C++ clients must reference a TLB file with the \#import directive.
03/30/2017
cpp
importing type library
COM interop, referencing .NET types
interoperation with unmanaged code, referencing .NET types
referencing .NET types
interoperation with unmanaged code, importing type library
type libraries
COM interop, importing type library
54917f6f-cb18-4103-b622-856b55da93f3

How to: Reference .NET Types from COM

From the point of view of client and server code, the differences between COM and the .NET Framework are largely invisible. Microsoft Visual Basic clients can view a .NET object in the object browser, which exposes the object methods and syntax, properties, and fields exactly as if it were any other COM object.

The process for importing a type library is slightly more complicated for C++ clients, although you use the same tools to export metadata to a COM type library. To reference .NET object members from an unmanaged C++ client, reference the TLB file (produced with Tlbexp.exe) with the #import directive. When referencing a type library from C++, you must either specify the raw_interfaces_only option or import the definitions in the base class library, Mscorlib.tlb.

To import a library

  • Specify the raw_interfaces_only option in the #import directive. For example:

    #import "..\LoanLib\LoanLib.tlb" raw_interfaces_only

    -or-

  • Include an #import directive for Mscorlib.tlb. For example:

    #import "mscorlib.tlb"  
#import "..\LoanLib\LoanLib.tlb"

See also