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ActiveX Technology
It can be tricky to figure out how to use the terms ActiveX and OLE. You can think of ActiveX as something that was created when the "old" OLE was revamped to work with the Internet. ActiveX includes Windows features that are built on COM (which you'll study in this part of the book), the Microsoft Internet Information Services (IIS) family, and the WinInet programming interface.Yes, OLE is still here, and once again it stands for Object Linking and Embedding, just as it did in the days of OLE 1.0. It's just another subset of ActiveX technology that includes odds and ends such as drag and drop. Unfortunately (or fortunately, if you have existing code), the MFC source code and the Windows API have not kept current with the naming conventions. As a result, you'll see lots of occurrences of OLE and Ole in class names and in function names even though some of those classes and functions go beyond linking and embedding. In this part of the book, you might also notice references to the "server" in the code generated by the MFC Application Wizard. Microsoft now reserves this term for database servers and Internet servers; component is the new term for OLE servers.
Bookstore computer sections are full of books on OLE, COM, and ActiveX. This book can't offer that level of detail, but you should come away with a pretty good understanding of COM theory. You'll find more on the connection to the MFC library classes than you might see in other books, with the exception of MFC Internals by George Shepherd and Scot Wingo (Addison-Wesley, 1996). The net result should be good preparation for the really heavy-duty ActiveX/COM books, including Kraig Brockschmidt's Inside OLE, 2nd edition (Microsoft Press, 1995) and Don Box's Essential COM (Addison-Wesley, 1998). A good mid-level book is Dale Rogerson's Inside COM (Microsoft Press, 1997).As you'll see in the final section of this book, COM brings as many problems to the table as it solves. Most of this technology will be superseded by the .NET component model, which uses assemblies and the common language runtime. However, COM is still important for the time being. So let's get cracking.
