qr code c# asp.net The Properties De ned by Stream in Visual C#

Generation QR Code in Visual C# The Properties De ned by Stream

The Properties De ned by Stream
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Part I:
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The C# Language
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The Character Stream Wrapper Classes
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To create a character stream, wrap a byte stream inside one of the character stream wrappers At the top of the character stream hierarchy are the abstract classes TextReader and TextWriter TextReader handles input, and TextWriter handles output The methods defined by these two abstract classes are available to all of their subclasses Thus, they form a minimal set of I/O functions that all character streams will have Table 14-3 shows the input methods in TextReader In general, these methods can throw an IOException on error (Some can throw other types of exceptions, too) Of particular interest is the ReadLine( ) method, which reads an entire line of text, returning it as a string This method is useful when reading input that contains embedded spaces TextReader also specifies the Close( ) method, shown here: void Close( ) It closes the reader and frees its resources TextWriter defines versions of Write( ) and WriteLine( ) that output all of the built-in types For example, here are just a few of their overloaded versions:
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Method void Write(int value) void Write(double value) void Write(bool value) void WriteLine(string value) void WriteLine(uint value) void WriteLine(char value) Description Writes an int Writes a double Writes a bool Writes a string followed by a newline Writes a uint followed by a newline Writes a char followed by a newline
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Method int Peek( ) int Read( )
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Description Obtains the next character from the input stream, but does not remove that character Returns 1 if no character is available Returns an integer representation of the next available character from the invoking input stream Returns 1 when the end of the stream is encountered Attempts to read up to count characters into buffer starting at buffer[count], returning the number of characters successfully read Attempts to read up to count characters into buffer starting at buffer[index], returning the number of characters successfully read Reads the next line of text and returns it as a string Null is returned if an attempt is made to read at end-of-file Reads all of the remaining characters in a stream and returns them as a string
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int Read(char[ ] buffer, int index, int count) int ReadBlock(char[ ] buffer, int index, int count) string ReadLine( ) string ReadToEnd( )
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TABLE 14-3
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The Input Methods De ned by TextReader
14:
Using I/O
All throw an IOException if an error occurs while writing TextWriter also specifies the Close( ) and Flush( ) methods shown here: virtual void Close( ) virtual void Flush( ) Flush( ) causes any data remaining in the output buffer to be written to the physical medium Close( ) closes the writer and frees its resources The TextReader and TextWriter classes are implemented by several character-based stream classes, including those shown here Thus, these streams provide the methods and properties specified by TextReader and TextWriter
Stream Class StreamReader StreamWriter StringReader StringWriter Description Reads characters from a byte stream This class wraps a byte input stream Writes characters to a byte stream This class wraps a byte output stream Reads characters from a string Writes characters to a string
PART I
Binary Streams
In addition to the byte and character streams, there are two binary stream classes that can be used to read and write binary data directly These streams are called BinaryReader and BinaryWriter We will look closely at these later in this chapter when binary file I/O is discussed Now that you understand the general layout of the I/O system, the rest of this chapter will examine its various pieces in detail, beginning with console I/O
Console I/O
Console I/O is accomplished through the standard streams ConsoleIn, ConsoleOut, and ConsoleError Console I/O has been used since 2, so you are already familiar with it As you will see, it has some additional capabilities Before we begin, however, it is important to emphasize a point made earlier in this book: Most real applications of C# will not be text-based, console programs Rather, they will be graphically oriented programs or components that rely upon a windowed interface for interaction with the user, or will be server-side code Thus, the portion of the I/O system that relates to console input and output is not widely used Although text-based programs are excellent as teaching examples, for short utility programs, and for some types of components, they are not suitable for most real-world applications
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