On Jul 30, 2013, at 4:26 AM, Michael Crawford <li...@warplife.com> wrote:
> However, I expect there is a way you could call an Objective-C method
> from vanilla C. Possibly you will need some assembly-language glue.
The nice thing is, you don't need glue. You can send Objective-C messages from
within C, as long as the code is compiled as Objective-C or Objective-C++. All
you need is...
> You will need some way for your C callback to be told what "self" is.
...bearing in mind that within the C function it doesn't have to be called
"self". It *can* be, if that makes things clearer, but as Jean-Daniel
mentioned, "self" has no special meaning within a C function. Depending on the
situation, "self" might be a *more* confusing name; personally, I would use
something else in most if not all cases but that may be a matter of taste.
Whether you use the name "self" or not, you can't refer to ivars in a C
function without a qualifier:
@implementation MyClass
- (void)myMethod
{
NSLog(@"%@", _myIvar); // okay because of implicit "self"
}
void myFunction(MyClass *self)
{
NSLog(@"%@", _myIvar); // compile error
NSLog(@"%@", self->_myIvar); // compiles okay
NSLog(@"%@", self.myIvar); // compiles okay if there is a myIvar property
[self myMethod]; // compiles okay
}
@end
--Andy
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