For a complete example of service resolution using NSStream objects, see the PictureSharing sample code project in the Mac Developer Library. Note that if you require only one of the two streams, you should pass NULL for the other parameter so that you do not get the other stream back. Listing 4-1 demonstrates how to connect to a network service ( NSNetService) using streams.

These streams provide a general-purpose means of communicating with TCP-based network services that is not tied to any specific protocol (such as HTTP). To interact asynchronously, you must schedule the streams in the current run loop and assign them a delegate object. This method provides a reference to an input stream ( NSInputStream) and an output stream ( NSOutputStream), both of which you may access synchronously or asynchronously. If you are connecting using Foundation’s raw TCP stream API (as opposed to a higher-level API, such as NSURLConnection), the most straightforward way to connect to a service is with a connect-to-service API, such as getInputStream:outputStream. In addition, the section Persisting a Bonjour Service describes how to properly store information about a service for later reuse, and the section Monitoring a Bonjour Service explains how a Bonjour service can provide additional information that clients can passively monitor without connecting to the service. These techniques are described in the sections that follow. Using a stream-based connect-to-service method such as getInputStream:outputStream. There are three ways to connect to a service, listed in order of preference: In either case, the way you connect to the service is the same.

You have saved information about a service for later use, and you have explicitly initialized an instance of the NSNetService class with that information. You have just browsed for services, and the user has chosen one. There are two occasions when you might need to connect to a Bonjour service: This chapter describes how to connect to a Bonjour-advertised service.

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