iOS cStringUsingEncoding内存管理问题

Hey, I am trying to convert NSString to a C string using cStringUsingEncoding but I have a memory leak. My understanding is that cStringUsingEncoding returns a pointer to a character array that is only guaranteed to exist for the duration of the NSString object. As such you should copy its contents to another string. Here's where my problem lies...

I have a function that accepts an NSString and turns it into a C-string copy. Just for testing I ran 1,000 iterations of the following method (to ensure no leaks).

 -(void)test{ NSString *test = [[NSString alloc] initWithString:@"Hello world!"]; for(int i=0; i<1000; i++) { char *tmp = [self returnCopiedCString:test]; //free memory free(tmp); } [test release]; }