Using a VC++ COM dll in .NET

[sendhil]

I have a VC++ COM dll which has some functions. I need to call those
functions from a .NET application. I know that it can be done if the
function takes simple data types.

If the function takes a structure or and enum values as an input and
these are defined in a header file(.h file). How do i create the
structure and call the function. can a .h file be included in a .NET
application.

Thanks
sendhil