05-17-2006, 11:09 PM
No, it is COM term.
COM objects support several interfaces (sets of functions, those as you see in popups when you type .), but at least IUnknown interface. When (in QM) an interface pointer variable is assigned to other interface pointer variable of other type, you have to use +. Then, at the run time, QM internally calls QueryInterface function of IUnknown. If the object supports the interface, ok, if not, is generated RT error.
COM objects support several interfaces (sets of functions, those as you see in popups when you type .), but at least IUnknown interface. When (in QM) an interface pointer variable is assigned to other interface pointer variable of other type, you have to use +. Then, at the run time, QM internally calls QueryInterface function of IUnknown. If the object supports the interface, ok, if not, is generated RT error.