Re: ControlRef vs. HIViewRef vs. HIObjectRef

• Subject: Re: ControlRef vs. HIViewRef vs. HIObjectRef
• From: Laurence Harris <email@hidden>
• Date: Tue, 30 Jan 2007 20:08:09 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On Jan 30, 2007, at 7:57 PM, Bryan Prusha wrote:

On Jan 30, 2007, at 4:48 PM, Rick Mann wrote:

HIViewRef is typedef'd to ControlRef, which is an opaque type. HIObjectRef is its own opaque type.

Internally, are these interchangeable? Can I freely cast from one to the other?

It seems that in the simple example of:

HIObjectRef  myView;
HIObjectCreate(kMyObjID, null, &myView)
HIViewSetFrame(myView, &theFrame);

One runs into problems, requiring a cast.

Are there ever situations where one might have an HIObjectRef that's not an HIViewRef?

Sorry for the pedantic questions; it speaks to programming Carbon from D.

WindowRefs, MenuRefs and HIViewRefs are all HIObjectRefs internally and can be cast appropriately. In the early days of HIObjects each sub type was initially type defined to an HIObjectRef. We noticed there was an issue with C++ routines that differed in signature only by the object type passed in (window, menu, view). In order to preserve this behavior we had to type define them separately but rest assured all windows, menus and views can be used in HIObject APIs.

Larry

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