Essential Com: Don Box Pdf ((full))

: Do not settle for poor-quality scans. Invest in a legal digital version—or hunt down a reasonably priced used paperback. Then, work through every code example. Type them yourself. Break them. Fix them. You will emerge not just as a COM programmer, but as a true systems programmer.

You’re writing a C# app that must call an old COM DLL (e.g., a proprietary finance engine). You get a InvalidCastException on a COM call. Box’s chapters on QueryInterface and interface inheritance reveal the issue: the COM object does not support the exact IID requested. You learn to add a cast to the correct interface or regenerate the interop assembly. essential com don box pdf

In COM, an object is only as good as the interfaces it exposes. Similarly, your business documents expose your expertise to clients. Essential COM - InformIT : Do not settle for poor-quality scans

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