Question

I want to use CFStreamCreatePairWithSocketToHost with NSInput– and OutputStreams. I have two ivars NSInputStream *_inputStream and NSOutputStream *_outputStream.

The following gives me two error messages:

CFStreamCreatePairWithSocketToHost(NULL,
  (__bridge_retained CFStringRef)self.hostname, self.port,
  (CFReadStreamRef *)&_inputStream, (CFWriteStreamRef *)&_outputStream);

error: cast of an indirect pointer to an Objective-C pointer to ‘CFReadStreamRef *‘ (aka ‘struct __CFReadStream **‘) is disallowed with ARC
error: cast of an indirect pointer to an Objective-C pointer to ‘CFWriteStreamRef *‘ (aka ‘struct __CFWriteStream **‘) is disallowed with ARC

How would I fix this? I tried using __bridge but I got similar error messages.

Answer 1

Pass a pointer to actual CFReadStreamRef and CFWriteStreamRef variables, then cast when assigning to your NSTypes. Basically:

CFThingRef cfThing = NULL;
CFFunctionGetThing(&cfThing);
NSThing * nsThing = cfThing;

Of course, you’ll have to add the appropriate bridge cast and do all appropriate reference count ops for cfThing.