ios - How do you convert an iPhone OSStatus code to something useful?

Question

I am getting more than a little sick of this iPhone SDK and its documentation...

I am calling AudioConverterNew

in the documentation under Returns: it says "returns a status code" ... really...

so far, through playing around with the parameters I have only been able to get two different errors neither of which are listed at the bottom of the Audio Converter reference.

they are 'mrep' and '?tmf' (casting the OSStatus to a char array) but the specific codes aren't really the point.

as far as I can tell, random error codes are defined in random files, so you can't just search one file, I can't find a help document that just lets you search for an error code to get more info, and from what I can tell, in OS X you can use GetMacOSStatusErrorString() to convert an error to something useful, but there is no iPhone equivalent?

any help would be greatly appreciated.

EDIT:

ok, so casting them gives them in reverse (something I checked for 'mrep' but was not there either way round) , fmt? is in the list for the Audio Converter api, and is pretty self explanatory if a bit vague, but fair enough, still 'perm' isn't there (although it might be something to do with the simulator not supporting aac decoding) and my general question still stands.

Answer 1

OSStatus is a signed integer value. You cannot convert or "cast" it to a string. You can convert it to a NSError like this:

NSError *error = [NSError errorWithDomain:NSOSStatusErrorDomain code:osStatus userInfo:nil];