File Upload COM Component in C++

[splsplspl]

All

I want to write a file upload component that I can use with my asp pages, I know you can get them free/cheap but I'm interested how they are built.

I'm going to write the COM component in C++ using ATL in Visual Studio. I've written quite a few components before so I kind of know what I'm doing. However, has anyone seen a tutorial (either on the net, or in a book) that can help me get started. I must admit I haven't got a clue how to start this, e.g. do I use the IRequest interafce, and it's related interfaces.

Any pointers with this would be much appreciated.

Thanks a lot