Download e-book for kindle: COM programming by example using MFC, ActiveX, ATL, ADO, and by John E. Swanke

By John E. Swanke

ISBN-10: 192962977X

ISBN-13: 9781929629770

Use MFC, ActiveX, ATL, ADO and COM+ to boost COM purposes enforce client/server purposes comfortably with this example-oriented method of the main points and implementation of COM know-how in community functions. If there has been ever an issue th

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Extra resources for COM programming by example using MFC, ActiveX, ATL, ADO, and COM+

Example text

But now, with the #import directive, you can just import the COM object information directly into your code from a type library (also generated when a COM object is built) or the actual DLL or EXE file itself. How Do You Create a COM Object Using #import and Smart Pointers? c files in the past, but considering the rapid public development of COM and the need to support legacy applications, all of the technologies mentioned in this book will probably be in use for years to come. Smart pointers resolve the second problem of actually having to deal with an API call when you’re programming in C++.

When a client does have access to the IDL information, specifically the class type override, your compiler fills in the addresses of any methods you How Do You Write a COM Object Using C++? 21 call in a technique called binding or early binding. But when this information isn’t available, you can still build functionality into your COM object so that a suitably prepared client can actually query your object at runtime to find out what methods it supports and what argument those methods require in a technique called late binding.

In the case of an ActiveX server, there are dozens of classes and functions you need to implement in order to keep your client happy. So instead of looking at how to write a COM object from scratch, we will be focusing on creating our COM classes with the assistance of two class libraries that Microsoft provides: the Microsoft Foundation Classes (MFC) and the Active Template Library (ATL) as well as their wizards. MFC, in fact, has several classes that wrap the COM API making it easier to use. ) and can make your object too bloated for an object that doesn’t need this functionality, such as an object that just wants to access a database.

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COM programming by example using MFC, ActiveX, ATL, ADO, and COM+ by John E. Swanke

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