Question

I am a new settle in Obj-C. I want to wrap a OpenCV class in Obj-C. I have a C++ class now, it is like:

class cxx {
private:
    IplImage* image;
public:
    cxx ();
    void modify ();
};

Now I am rewriting in Obj-C, I get confused in the memory type of the pointers. I put it in a class:

class obj_c:NSObjec {
    IplImage* image;
}

- (id) init;
- (void) modify;

But I don t how to deal with the right property of the pointer IplImage*. If I don t set any property, I can t even access the pointer in the function.

Answer 1

@interface objc_c : NSObject {
   IplImage * image;
}
- (id)init;
- (void)modify;
@end

That s how you make a class in objective-c. And in the body of the functions, init and modify, yes, you will be able to access the pointer. You don t have to declare properties unless you want to access an ivar from outside of the class (typically).

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