Jon,

   For starters, you are going to want to read up on the section of the
MSDN documentation titled "Exposing .NET Framework Components to COM",
located at:

http://msdn2.microsoft.com/en-us/library/zsfww439(VS.80).aspx

   As for your particular interfaces (IInternetProtocolRoot,
IInternetProtocolSink, and IInternetProtocol), you are going to have to
define those in your code (with the appropriate marshaling attributes, which
are specified in the link above) and then access them appropriately.

   You might also want to look in the header/idl files that these are
defined in, as you will need the IID (interface ids) in order to define them
in .NET.

   Looking at http://www.pinvoke.net, there are definitions for the
interfaces you need:

IInternetProtocol -
http://www.pinvoke.net/default.aspx/Interfaces/IInternetProtocol.html
IInternetProtocolRoot -
http://www.pinvoke.net/default.aspx/Interfaces/IInternetProtocolRoot.html
IInternetProtocolSink -
http://www.pinvoke.net/default.aspx/Interfaces/IInternetProtocolSink.html

   You can use these definitions, and then just focus on the
implementation.

From what I gather, I need:

IInternetProtocolRoot::Start
IInternetProtocolSink::ReportProgress
IInternetProtocolSink::ReportData
IInternetProtocol::Read

...the problem is, I've never worked with COM interfaces before, and I
have no idea how I would write this.  Even more general code that
showed how to implement COM interfaces would be helpful.

--Jon

On Dec 24, 12:11 pm, "Nicholas Paldino [.NET/C# MVP]"
<m...@spam.guard.caspershouse.com> wrote: