casting - Objective Cconvert id(type) to NSNumber:Error -

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i want convert id* nsnumber *

trying unsigned int shortvalue = [(nsnumber *)idobject unsignedshortvalue];

but aint compiling

cast of indirect pointer objective-c pointer 'nsnumber *' disallowed arc

any ideas how it. id* object argument method ,second argument type information of id* object inside method performing type specific methods on 1 above

id semi-primitive type, declared in objc.h as

typedef struct objc_object {     class isa; } *id;

when create id objects, don't use "*", pointers objects, don't this:

id *someobject;

the correct syntax this:

id someobject;

hope helps!

--------edit------ tried out code used:

unsigned int shortvalue = [(nsnumber *)idobject unsignedshortvalue];

and compiled fine. think error how create idobject.

---------edit---------

here's apple doc on id: http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/objectivec/chapters/ocobjectsclasses.html , here's 2 resources on isa pointer: what isa mean in objective-c?, http://cocoasamurai.blogspot.com/2010/01/understanding-objective-c-runtime.html. in second link, scroll top third of article find info on isa*. hope helps!


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