Decode OSStatus error codes into strings.

OSStatus.m

NSString *NSStringFromOSStatus(OSStatus errCode)
{
    if (errCode == noErr)
        return @"noErr";
    char message[5] = {0};
    *(UInt32*) message = CFSwapInt32HostToBig(errCode);
    return [NSString stringWithCString:message encoding:NSASCIIStringEncoding];
}

gr8t!

(NSString *) CreateTypeStringWithOSType(OSType inType); // ;-)

In macOS easier way is to use SecCopyErrorMessageString.

NSString *errorMessage = [((NSString *)SecCopyErrorMessageString(errCode, NULL))autorelease];

Thanks