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In C, a file is a logical concept that can be applied to everything from disk files to terminals or printers You associate a stream with a specific file by performing an open operation Once a file is open, information can be exchanged between it and your program Not all files have the same capabilities For example, a disk file can support random access, while some printers cannot This illustrates an important point about the C I/O system: All streams are the same, but all files are not If the file can support random access (also called position requests), opening that file initializes the file position indicator to the start of the file As each character is read from or written to the file, the position indicator is incremented, ensuring progression through the file The smallest accessible portion of a disk is a sector Information is written to or read from a disk one sector at a time Thus, even if your program only needs a single byte of data, an entire sector of data will be read This data is put into a region of memory called a buffer until it can be used by your program When data is output to a disk file, it is buffered until a full sector s worth of information has been accumulated, at which point it is actually physically written to the file You disassociate a file from a specific stream using a close operation Closing a stream causes any contents of its associated buffer to be written to the external device (it will be padded, if necessary, to fill out a complete sector) This process, generally called flushing the buffer, guarantees that no information is accidentally left in the disk buffer All files are closed automatically when your program terminates normally by main( ) returning to the operating system or by calling exit( ) However, it is better to actually close a file using fclose( ) as soon as it is no longer needed because several events can prevent the buffer from being written to the disk file For example, files are not written if a program terminates through a call to abort( ), if it crashes, or if the user turns the computer off before terminating the program At the beginning of a program s execution five predefined text streams are opened They are stdin, stdout, stderr, stdaux, and stdprn, and they refer to the standard I/O devices connected to the system, as shown here:.

Discovery process Defining the process in which OAM-enabled devices discover their peers on the link and notify each other of their OAM-related capabilities Link performance monitoring Defining attributes and status information for Ethernet links through exchange of specialized OAM link performance frames Remote fault detection Describing means of detecting and handling compromised links in any underlying Ethernet network infrastructure Remote loopback Providing means for the testing individual links and segments by sending test frames through them, based on a generic OAM protocol MIB variable retrieval Providing management information look-up from a remote database, delivering required OAM-specific information on the given network structure Organization-specific enhancements Enabling provision for vendor-specific enhancements to the protocol, adding any required functionalities that are out of scope of the respective IEEE standard

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Now we re getting somewhere, but the name of the process by itself isn t overly interesting. It would be nice to have the ID and, perhaps, the WorkingSet as well. The Process class has a lot of properties, so we should hook up at least a couple more (listing 11.2).

The first three streams are defined by ANSI/ISO Standard C, and any code that uses them is fully portable The last two are specific to C++ Builder and may not be portable to other compilers Most operating systems allow I/O redirection, so routines that read or write to these streams can be redirected to other devices (Redirection of I/O is the process whereby information that would normally go to one device is rerouted to another device by the operating system) You should never try explicitly to open or close these files Each stream that is associated with a file has a file control structure of type FILE This structure is defined in the header <stdioh> You must not make modifications to this structure If you are new to programming, C s separation of streams and files may seem unnecessary or contrived Just remember that its main purpose is to provide a consistent interface In C, you need only think in terms of streams and use only one file system to accomplish all I/O operations The C I/O system automatically converts the raw input or output from each device into an easily managed stream The remainder of this chapter discusses the Standard C I/O system It does so by dividing it into two parts: console I/O and file I/O As you will see, these are different sides of the same coin However, this somewhat artificial distinction makes it easier to discuss them

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Console I/O refers to operations that occur at the keyboard and screen of your computer Because input and output to the console is such a common affair, a subsystem of the C I/O file system was created to deal exclusively with console I/O Technically, these functions direct their operations to the standard input (stdin) and standard output (stdout) of the system Thus, it is possible to redirect console I/O to other devices However, in this chapter it is assumed that the standard input and the standard output have not been redirected Neither the C nor C++ languages provide built-in support for graphic user interfaces such as Windows When performing input or output in a Windows environment, you will need to use special functions defined by Windows itself

<ListView.ItemTemplate> <DataTemplate> <WrapPanel> <TextBlock Text="{Binding Path=Id}" MinWidth="80" /> <TextBlock Text="{Binding Path=ProcessName}" MinWidth="180" /> <TextBlock> <TextBlock.Text> <Binding Path="WorkingSet" />

The simplest of the console I/O functions are getchar( ), which reads a character from the keyboard, and putchar( ), which prints a character to the screen However, getchar( ) has some significant limitations, which are described later For this reason, most of the time you will substitute getche( ) when you need to read a character The