A developer encountered a series of errors while trying to add XAML support to their application by including the header file winrt/Windows.UI.Xaml.h. The errors were caused by a conflicting macro named ErrorMessage present in their project, which interfered with the method declaration in the C++/WinRT header file. The macro attempted to substitute parameters causing nonsensical code and a cascade of errors. One solution presented was to remove the macro when including the troublesome header file. The content highlights how macros can create unexpected issues in code and offers practical solutions to resolve them.
https://devblogs.microsoft.com/oldnewthing/20241206-00/?p=110614