PSA: windows.h is No Longer Implicitly Included with aced.h In the ObjectARX 2018 SDK (HyperPics: Beyond the UI)

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PSA: windows.h is No Longer Implicitly Included with aced.h In the ObjectARX 2018 SDK

Prior to the AutoCAD 2018-based products and the ObjectARX 2018 SDK, the aced.h header file implicitly included <windows.h>. When building ObjectARX applications for AutoCAD 2018-based products on Windows, you must now include <windows.h> in one of your C++ source files when aced.h is included. Failure to do so will result in a series of compiler errors that cause the project to no longer build. The following image shows an example of the compiler errors you may encounter when including aced.h and not windows.h.