> The core API for both Windows and Macintosh is procedural C language. > The core API has to be a C language binding. > A disadvantage is that the core API i

> The core API for both Windows and Macintosh is procedural C language. > The core API has to be a C language binding. > A disadvantage is that the core API is in Objective C which is unfamiliar to most developers, but a straight C API could be generated, as Apple have demonstrated with MacOS X. The core API for the OS X UI is definitely not in C. There is only an Objective-C API, and it is not a shim over anything. (It uses the Quartz windowing system, but that does not provide things like button widgets, etc.) There is no C equivalent of NSView, for example.