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Ann: lesson 5 in Windows API level GUI programming "Window messagebasics"

Alf P. Steinbach
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Contents of this lesson:
> The power and limits of resources.
> Packed message arguments, manual unpacking.
> Use a separate message handler function for each message.
> Unpack arguments via undocumented message cracker macros.
> Be pedantically correct: support message results.

This lessonís main points:

* Windows window messages are much like C++ virtual functions.
* The packing and unpacking of messages, having messages as data,
introduces some complexity.
* Dialog procedures impose special (complex) requirements on message

Cheers & enjoy,

- Alf
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