Download COM Programming by Example: Using MFC, ActiveX, ATL, ADO, by John E. Swanke PDF

By John E. Swanke

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Extra resources for COM Programming by Example: Using MFC, ActiveX, ATL, ADO, and COM+ (with CD-ROM

Example text

This time the server can change the memory or even deallocate it, but the client and server promise that this is the only pointer to this particular chunk of memory. This way COM doesn’t have to worry about reconciling what multiple pointers do to that chunk of memory while in the server before it sends it back to the client. • [ptr] is the most overhead to COM, but the most transparent to you. You don’t have to worry much about anything except making sure this argument is NULL if you’re not using it.

The MFC DLL is stuffed with user interface classes that are wasted space with the majority of number crunching COM objects. Sure, you also need COM objects that deal with the interface, but that’s what ActiveX COM objects are for, and MFC does have an ActiveX Wizard that makes writing those COM classes easier. Let’s just say that a lot of early COM programmers had to worry about early binding until ATL came along. Note: There is one area where MFC early binding is still important — when it comes to COM EXE servers that you also want to support MFC.

COM still allocates the full size of the array on the other side — it just doesn’t transmit all of its elements. For the syntax to use with VJ++, please refer to Example 35 (page 270). Structures and COM Classes Although IDL supports passing structures, the COM DLL does not. On the other hand, even IDL doesn’t pass a regular C++ class — which is kind of inconsistent considering a structure in C++ is just another C++ class (a structure is a C++ class where the member variables and functions are by default public).

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