Appendix D. Attributed ATL
ATL has always been the most powerful way to build COM objects in C++. Unfortunately, with that power comes complexity. ATL requires an advanced understanding of C++ to use it effectively. That advanced understanding took more effort than many people were willing to invest. Instead, many of those users used Visual Basic to do COM instead of C++. Unfortunately, there are some COM things VB 6 just doesn’t do (including marshal-by-value, ActiveX controls with sophisticated drawing, and multithreading); when people hit those limits, they were forced back into the C++ world.
Even for those who are experienced C++ developers, building ATL projects can be a headache. Some of the most important information about your project ...
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