A fast, easy to use, free, and community supported 2D game engine
Greg
Member
In debug mode, stepping to the problem point shows that there is an object reference in the variable obj, but then it's blown out with the EXC_BAD_ACCESS when I try to print that object to the console. Or perhaps all of this is a simple logging question: is there a catch-all way to dump the type/contents of an id type?
static void
eachShape(void *ptr, void* unused) {
cpShape *shape = (cpShape *) ptr;
id obj = shape->data;
NSLog(@"shape->data: %@", obj); // this is where I dieWhat are you expecting it to print? The class name of the object? If so you can do this I believe:
NSLog(@"shape->data: %@", [obj className])Edit:
I used the google machine and it looks like the above is wrong and the right way to get a string descriptor from an object is to do either:
[[obj class] description]or
NSStringFromClass([obj class])
Greg
Member
Actually I solved the problem by stepping away for a moment and then coming back to do a full code review. What I discovered was that my Item class, which contained a pointer to the sprite (which is ultimately referenced by shape->data), was declaring the property of the sprite to be assign, rather than retain. So by the time I tried to access the reference at shape->data, I had lost the reference.
I read some more and understand that NSLog is basically only useful if you know what data type you do have, so I think my question wasn't really a good syntax question, but more of a debugging question.
Thanks for helping though!
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