Most programs would be better served by higher-level APIs such as NSURLConnection. Important: This article describes ways to make socket connections that are completely under the control of your program. Whether you’re developing services for website visitors, mobile app users, online learners, subscribers or consumers, text to speech allows you to respond to the different needs and desires of each user in terms of how. Text to speech enables brands, companies, and organizations to deliver enhanced end-user experience, while minimizing costs.Click the pop-up menu below the microphone icon, then choose the microphone you want to use for keyboard dictation. Open the Dictation pane for me. No separate processing cluster required Develop on Mac, Linux, Windows.On your Mac, choose Apple menu > System Preferences, click Keyboard, then click Dictation.
Stream Text Software Can BeThe networking code itself is identical.Stream-based clients—Programs that use TCP to send and receive data as two continuous streams of bytes, one in each direction.With stream-based communication, clients and servers are somewhat more distinct. At a lower level, however, the lines are often blurry.Socket and stream programming generally falls into one of the following broad categories:Packet-based communication—Programs that operate on one packet at a time, listening for incoming packets, then sending packets in reply.With packet-based communication, the only differences between clients and servers are the contents of the packets that each program sends and receives, and (presumably) what each program does with the data. Most programs written using high-level APIs are purely clients. At a high level, these lines are clear. Plus access around-the-clock coverage with NBA TV.The APIs described in this article should be used only if you need to support some protocol other than the protocols supported by built-in Cocoa or Core Foundation functionality.At almost every level of networking, software can be divided into two categories: clients (programs that connect to other apps) and services (programs that other apps connect to).It is a connect-by-IP API rather than a connect-by-name API, which means that you must do a lot of extra work if you want to achieve the same initial-connection performance and robustness that higher-level APIs give you for free. Thus, as a general rule, you should separate the networking code from any common data processing functionality and rewrite the networking code using higher-level APIs.Note: If you use POSIX networking code, you should be aware that the POSIX networking API is not protocol-agnostic (you must handle some of the differences between IPv4 and IPv6 yourself). Alternatively, if you are using Grand Central Dispatch (GCD), you can add a socket as a dispatch source.In iOS, POSIX networking is discouraged because it does not activate the cellular radio or on-demand VPN. If your program is based on a Core Foundation or Cocoa (Foundation) run loop, you can also use the Core Foundation CFStream API to integrate the POSIX networking code into your overall architecture on the main thread. Here are a few factors to consider:In OS X, if you already have networking code that is shared with non-Apple platforms, you can use POSIX C networking APIs and continue to use your networking code as-is (on a separate thread). It also depends on whether you are using TCP or some other protocol. ![]() Read Discovering and Advertising Network Services in Networking Overview for more information.Use POSIX calls if cross-platform portability is required.If you are writing networking code that runs exclusively in OS X and iOS, you should generally avoid POSIX networking calls, because they are harder to work with than higher-level APIs. You can use CFStreamCreatePairWithSocketToHost or CFStreamCreatePairWithSocketToCFHost to open a socket connected to a given host and port and associate a pair of CFStream objects with it.You can also use the CFStreamCreatePairWithSocketToNetService function to connect to a Bonjour service. It integrates more easily with other Core Foundation APIs than CFSocket, and enables the cellular hardware on iOS (where applicable), unlike lower-level APIs. See NSNetService and Automatic Reference Counting (ARC) for details.Use CFStream for outgoing connections in C.If you are writing code that cannot include Objective-C, use the CFStream API. Thus, it is unsafe to construct an NSHost object on your main application thread. When you create the object, the lookup is performed synchronously. Streams automatically handle many of the challenges that TCP connections present. Establishing a ConnectionAs a rule, the recommended way to establish a TCP connection to a remote host is with streams. Except where noted, the CFStream API has functions with similar names, and behaves similarly.To learn more about the POSIX socket API, read the UNIX Socket FAQ at. For this reason, the POSIX networking API is generally discouraged in iOS.The subsections below describe the use of NSStream. If you use synchronous networking calls in a GUI application, you must do so on a separate thread.Note: POSIX networking does not activate the cellular radio on iOS. Mac cleaner free browser memoryThen cast them to NSInputStream and NSOutputStream objects, set their delegate objects (which should conform to the NSStreamDelegate protocol), schedule them on the current run loop, and call their open methods.Note: If you are working with more than one connection at a time, you must also keep track of which input stream is associated with a given output stream and vice versa. Read Discovering and Advertising Network Services in Networking Overview for more information.After you have obtained your input and output streams, you should retain them immediately if you are not using automatic reference counting. You can then take advantage of the toll-free bridge between CFStream and NSStream to cast your CFReadStreamRef and CFWriteStreamRef objects to NSInputStream and NSOutputStream objects.If you discovered the host by browsing for network services with a CFNetServiceBrowser object, you obtain input and output streams for the service with the CFStreamCreatePairWithSocketToNetService function. Streams are also a more Cocoa-like networking interface than lower-level protocols, behaving in a way that is largely compatible with the Cocoa file stream APIs.The way you obtain input and output streams for a host depends on whether you used service discovery to discover the host:If you already know the DNS name or IP address of the remote host, obtain Core Foundation read (input) and write (output) streams with the CFStreamCreatePairWithSocketToHost function. Mac os image emulator windowsThis method returns the number of bytes read, or a negative number on error.If fewer bytes were read than you need, you must queue the data and wait until you receive another stream event with additional data. If an error occurs, you should call streamError to find out what went wrong.When the stream:handleEvent: method is called on your NSInputStream object’s delegate and the streamEvent parameter’s value is NSStreamEventHasBytesAvailable, your input stream has received data that you can read with the read:maxLength: method. If fewer bytes were written than you tried to send, you must queue up the remaining data and send it after the delegate method gets called again with an NSStreamEventHasSpaceAvailable event. This method returns the number of bytes written or a negative number on error.
0 Comments
Leave a Reply. |
AuthorErin ArchivesCategories |