Taulrajas After the message has been constructed, you serialize it. Both return the number of bytes read, 0 if at the end of stream or file, or -1 if an error occurred. Thank you for providing feedback! So if you set it to your function myRetainas in the code above, CFStream will call myRetain myPtr to retain the info pointer.
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Taulrajas After the message has been constructed, you serialize it. Both return the number of bytes read, 0 if at the end of stream or file, or -1 if an error occurred. Thank you for providing feedback! So if you set it to your function myRetainas in the code above, CFStream will call myRetain myPtr to retain the info pointer. If you set the copyDescription parameter to NULLthen the system will provide, if requested, a rudimentary description of what is in the memory pointed to by the info pointer.
Additionally, the reader should be familiar OS X programming concepts programmjng run loops. One major difference is that the function CFWriteStreamWrite does not guarantee to accept all of the bytes that you pass it. Now, wait for your callback function to be executed. Fix typos or links Fix incorrect information Add or update code samples Add or update illustrations Add information about Additionally, you can use CFNetDiagnostics to query for connectivity status and programmong uniform error messages to the user.
The chapter Working with Streams describes how to use read and guire streams. This allows you to not have to poll your socket stream, which would slow down the thread. Android and Model-View-Controller Chapter 3. CFNetwork is a low-level, high-performance framework that gives you the ability to have detailed control over the protocol stack. Listing is an example of opening the read stream.
The retain parameter is a pointer to a function to retain the info parameter. If you are implementing your streams synchronously your entire application guie be forced to wait on the data transfer. A stream is a sequence of bytes transmitted serially over a communications path.
Your input helps improve our developer documentation. Applications that connect to networks depend on a stable connection. The process of acquiring information about a host is known as resolution. It will serve you for as long as you write or maintain OpenGL code. For example, if the server that the stream is connecting to requires a user name and password, you need to set the appropriate properties so the stream can work properly.
Once the network failure has been diagnosed, CFNetDiagnostics guides the user to fix the problem. Please try submitting your feedback later. Using FTP read and write streams you can perform functions such as:.
It allows you to connect to another socket either locally or over a network and send data to that socket. Start programming robots NOW! How helpful is this document? To submit a product bug or enhancement request, please visit the Bug Reporter page.
Then the request message is sent to the server. Next, you open the stream and read or write any number of times. Your callback function is called when it is possible to read and write without blocking.
The domain code programmong how the error code should be interpreted. How can we improve this document? In addition to the documentation provided by Apple, the following is the reference book for socket-level programming:. Opening a stream causes the stream to reserve any system resources that it requires, such as the file descriptor needed to open the file. Related Posts.
Introduction to CFNetwork Programming Guide(译)
If you are implementing your streams synchronously your entire application will be forced to wait on the data transfer. Therefore, it is highly recommended that your code use alternate methods to prevent blocking. There are two ways to prevent blocking when reading from or writing to a CFStream object: Using a run loop — Register to receive stream-related events and schedule the stream on a run loop. When a stream-related event occurs, your callback function specified by the registration call is called. Polling — For read streams, find out if there are bytes to read before reading from the stream.
CFNetwork Programming Guide
Doum If you send an HTTP request to an authentication server without credentials or with incorrect credentialsthe server returns an authorization challenge more commonly known as a or response. A run loop executes on your main program thread. There are two ways to apply firewall settings to a stream. Documentation Archive Developer Search.