Convert NSString to FSRef

FROM : Kevin Dixon
DATE : Sat Mar 15 20:04:21 2008

I'm trying to write a method that will convert a NSString containing a
file system URL to an FSRef with the following code

- (FSRef)stringToFSRef: (NSString*)filePath {
   FSRef output;

   CFStringRef cfFilePath = CFStringCreateWithCString(NULL, [filePath
cString], (CFStringEncoding)8);

   CFURLRef url = CFCreateURLWithString(NULL, cfFilePath, NULL);

   CFURLGetFSRef(url, &output);

   return output;
}

I am getting a warning on the CFCreateURLWithString, saying
"initialization makes pointer from integer without a cast"
I'm not sure what it is referring to. I've tried casting all of the
arguments to their required types, and the warning persists.

Also, is there a better way to accomplish this?

-Kevin