print barcode in crystal report vb.net FILES, STREAMS, AND IO in C#.NET

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CHAPTER 20 FILES, STREAMS, AND IO
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Read Line: True Read Line: 20172 Read Line: 12.345 Press enter to finish The StreamReader class has a small number of methods that can read a single string from the underlying stream (such as ReadLine, used in Listing 20-23) or read multiple lines. These methods are described by Table 20-32. Table 20-32. StreamReader Methods
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ReadLine()
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Reads a single string from the underlying stream. Returns null if the end of the stream has been reached. Reads the stream from the current cursor to the end of the stream and returns the result as a single string. Reads a block of characters into the char array.
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ReadToEnd()
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ReadBlock(char[], int, int)
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Some care must be taken when reading string values from a StreamReader, especially when using the ReadToEnd method. The amount of data that is read from the Stream can be exceed the amount of memory available and cause an exception.
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In this chapter, we looked at how C# supports working with files and directories, using either the File and Directory or FileInfo and DirectoryInfo classes. We saw how to compose and manipulate file paths using the Path class and how to monitor a directory for changes and how to specify which changes we are interested in. We also explored the support for streams, which are a general-purpose feature for reading and writing sequential byte data to a range of backing stores in a consistent way. Because working with byte values can be very tedious, we also looked at the reader and writer classes that make working with binary and textual representations of built-in type values a breeze.
C H A P T E R 21
Networking & WCF
The .NET Framework Class Library contains extensive support for network programming. Classes range from the convenient (allowing you to retrieve data from HTTP servers simply and easily) to the low-level (creating custom network protocols) to the feature-rich (creating web-services and service-oriented protocol). To get the most from this chapter, you will need a basic understanding of networking in particular, an appreciation of the Internet Protocol (IP) and associated protocols, such as TCP, UDP and HTTP. Table 21-1 provides the summary for this chapter. Table 21-1. Quick Problem/Solution Reference for 21
Problem
Retrieve data from a server.
Solution
Use the WebClient class.
Listings
21-1 through 21-5 21-6, 21-7 21-8, 21-9 21-10 through 21-12 21-13, 21-14 21-15 21-16, 21-17 21-18
Create a simple TCP server. Implement a simple TCP client. Create a web service.
Use the TcpListener class. Use the TcpClient class. Use the Windows Communications Foundation.
Consume a web service. Create an HTTP server. Create a UDP client. Query the Domain Name System.
Use the Windows Communications Foundation. Use the HttpListener class. Use the UdpClient class. Use the Dns class.
Requesting Data
One of the most common network programing activities is requesting data from a remote server most typically, a web server. The System.Net.WebClient provides a simple and convenient means of doing just that, as demonstrated by Listing 21-1.
CHAPTER 21 NETWORKING & WCF
Listing 21-1. Requesting Server Data Using the WebClient Class using System; using System.IO; using System.Net; class Listing 01 { static void Main(string[] args) { // create a Webclient object WebClient myWebClient = new WebClient(); // open a stream to the target URL Stream dataStream = myWebClient.OpenRead("http://microsoft.com"); // create a StreamReader around the Stream StreamReader dataReader = new StreamReader(dataStream); // read the contents of the URL as a single string string dataLine = dataReader.ReadToEnd(); // write out the received data Console.WriteLine(dataLine); // close the reader dataReader.Close(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In Listing 21-1, you create new instance of the WebClient class using the default constructor and then call the OpenRead method, passing a string value representing the URL you want to download. The OpenRead method returns a Stream object which is backed by the network connection. Wrap this in a StreamReader object so that you can read the entire response from the server as a single string using the ReadToEnd method. The WebClient class really makes it easy to handle simple network requests. Compiling and running Listing 21-1 produces the following output: <html><head><title>Microsoft Corporation</title><meta http-equiv="X-UA-Compatibl e" content="IE=EmulateIE7"></meta><meta http-equiv="Content-Type" content="text/ html; charset=utf-8"></meta><meta name="SearchTitle" content="Microsoft.com" sch eme=""></meta><meta name="Description" content="Get product information, support , and news from Microsoft." scheme=""></meta><meta name="Title" content="Microso ft.com Home Page" scheme=""></meta><meta name="Keywords" content="Microsoft, pro duct, support, help, training, Office, Windows, software, download, trial, previ ew, demo, business, security, update, free, computer, PC, server, search, downl oad, install, news" scheme=""></meta><meta name="SearchDescription" content="Mic
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