Internet/网络编程

开发平台：
C#

frmClient.cs：源码内容
							namespace Client				// Copyright 2001 Dreamtech Software India Inc.
{								// All rights reserved
    using System;				// Provides the basic functionality of .NET
	using System.Drawing;		// Provides the Drawing features, Used for cursors
	using System.Collections;	// Provides the different type of class collections
	using System.ComponentModel;// Provides the facility of using components
	using System.Windows.Forms;	// Provides the darwing of buttons, listviews etc	
	using System.Net;			// Provides the net related functionality 
	using System.Text;			// Provides the text manipulation functions
	using System.IO;			// Provides I/O features
	using WorkingWithXML;		// Custom Class
	
	/// <summary>
	/// This structure is used for book keeping purpose
	/// The currently running listener list will be requsted
	/// by the server and server sends that list
	/// Each record in this structure represent the data for the single
	/// running listener
	/// </summary>
	public struct __CONNECTEDCOMPUTERS
	{
		/// <summary>
		/// Declares the string used to store the name of the listener
		/// This name is in human redable format
		/// </summary>
		public string	sComputername;
		
		/// <summary>
		/// sIPAddress variable is used to store the IP address of 
		/// the listener
		/// </summary>
		public string	sIPAddress;
		
		/// <summary>
		/// This will be 0 in starting and consequently filled
		/// by every search operation
		/// </summary>
		public int		iFilesFound;
	}
	/// <summary>
    ///    Summary description for frmClient class.
    /// </summary>
    public class frmClient : System.Windows.Forms.Form
    {
		private System.ComponentModel.IContainer	components;
		private System.Windows.Forms.Button			btnViewFiles;
		private System.Windows.Forms.Button			btnSearch;
		private System.Windows.Forms.ToolTip		ToolTipText;
		private System.Windows.Forms.Button			btnQuit;
		private System.Windows.Forms.Button			btnRefresh;
		private System.Windows.Forms.Button			btnOpen;
		/// <summary>
		/// The below declared variables are the user defined variables
		/// used within this class
		/// </summary>
		
		/// <summary>
		/// Stores the total number of listeners found 
		/// </summary>
		private int						iConnectedComputers;
		
		/// <summary>
		/// Stores the number of search results found for 
		/// the matching criteria
		/// </summary>
		private int						iSearchResult;
		
		/// <summary>
		/// Declares a xmlParser variable of type XMLParser (User defined class)
		/// </summary>
		private XMLParser	 			xmlParser;
		
		/// <summary>
		/// Declares a xmlServerComm variable of type ServerCommunication 
		/// (User defined class)
		/// </summary>
		private ServerCommunication		xmlServerComm;
		/// <summary>
		/// Declares an object xmlStruct of type XMLSTRUCT (User defined class)
		/// </summary>
		private XMLSTRUCT				xmlStruct;
		
		/// <summary>
		/// Declares an array of ConnectedComputers of type 
		/// __CONNECTEDCOMPUTERS structures
		/// </summary>
		private __CONNECTEDCOMPUTERS[]				ConnectedComputers;
		private System.Windows.Forms.ListView		lvComputers;
		private System.Windows.Forms.ColumnHeader	clhComputername;
		private System.Windows.Forms.ColumnHeader	clhIPAddress;
		private System.Windows.Forms.ColumnHeader	clhObjects;
		private System.Windows.Forms.Label lblCopyright;
		
		/// <summary>
		/// declares sSubItems variable as an array of string
		/// </summary>
		private System.Windows.Forms.ListViewItem	lvItems;
		/// <summary>
		/// This is the default constructor of the class
		/// </summary>
		public frmClient()
        {
            //
            // Required for Windows Form Designer support
            //
            // Auto generated function by the IDE
			InitializeComponent();
			// Puts the Computer.ico as the form icon
			this.Icon = new System.Drawing.Icon(Application.StartupPath + "\Computer.ico");
			
			// Creates a new instance of XMLParser class
			xmlParser = new WorkingWithXML.XMLParser();
			
			// Creates a new instance of XMLSTRUCT structure
			xmlStruct = new WorkingWithXML.XMLSTRUCT();
			
			// Creates a new instance for ServerCommunication class
			xmlServerComm = new WorkingWithXML.ServerCommunication();
			
			// Assigns the global value for USERLISTXML
			xmlParser.USERLISTXML = Application.StartupPath + "\userlist.xml";
			
			// Assigns the global value for SERVERSEARCHXML
			xmlParser.SERVERSEARCHRESULTXML = Application.StartupPath + "\search.xml";
 			try
			{
				// Fills the List view with the values
				// these values are the response from the server
				if( 0 ==  PopulateList() )
					// Displays a message if no computer is connected to the network
					throw new Exception("No computer is connected to the network. The list will be empty"); 
			}
			
			// Hanldes every exceptions that is thrown 
			catch( Exception err ) { MessageBox.Show(err.Message,"Warning",MessageBoxButtons.OK, MessageBoxIcon.Warning); }
        }
        /// <summary>
        ///    Clean up any resources being used.
        ///    This is auto generated by the IDE
        /// </summary>
        public override void Dispose()
        {
            base.Dispose();
			components.Dispose();
        }
        /// <summary>
        ///    Required method for Designer support - do not modify
        ///    the contents of this method with the code editor.
        ///     this code is generated automatically by the IDE
        /// </summary>
        private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.ToolTipText = new System.Windows.Forms.ToolTip(this.components);
			this.btnSearch = new System.Windows.Forms.Button();
			this.btnQuit = new System.Windows.Forms.Button();
			this.btnViewFiles = new System.Windows.Forms.Button();
			this.btnRefresh = new System.Windows.Forms.Button();
			this.btnOpen = new System.Windows.Forms.Button();
			this.lvComputers = new System.Windows.Forms.ListView();
			this.clhComputername = new System.Windows.Forms.ColumnHeader();
			this.clhIPAddress = new System.Windows.Forms.ColumnHeader();
			this.clhObjects = new System.Windows.Forms.ColumnHeader();
			this.lblCopyright = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// btnSearch
			// 
			this.btnSearch.BackColor = System.Drawing.Color.Chocolate;
			this.btnSearch.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.btnSearch.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
			this.btnSearch.ForeColor = System.Drawing.Color.White;
			this.btnSearch.Location = new System.Drawing.Point(137, 1);
			this.btnSearch.Name = "btnSearch";
			this.btnSearch.Size = new System.Drawing.Size(67, 35);
			this.btnSearch.TabIndex = 2;
			this.btnSearch.Text = "&Search";
			this.ToolTipText.SetToolTip(this.btnSearch, "Search on computers for filenames");
			this.btnSearch.Click += new System.EventHandler(this.btnSearch_Click);
			// 
			// btnQuit
			// 
			this.btnQuit.BackColor = System.Drawing.Color.Chocolate;
			this.btnQuit.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.btnQuit.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
			this.btnQuit.ForeColor = System.Drawing.Color.White;
			this.btnQuit.Location = new System.Drawing.Point(270, 1);
			this.btnQuit.Name = "btnQuit";
			this.btnQuit.Size = new System.Drawing.Size(67, 35);
			this.btnQuit.TabIndex = 3;
			this.btnQuit.Text = "&Quit";
			this.ToolTipText.SetToolTip(this.btnQuit, "Quit this application");
			this.btnQuit.Click += new System.EventHandler(this.btnQuit_Click);
			// 
			// btnViewFiles
			// 
			this.btnViewFiles.BackColor = System.Drawing.Color.Chocolate;
			this.btnViewFiles.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.btnViewFiles.Enabled = false;
			this.btnViewFiles.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
			this.btnViewFiles.ForeColor = System.Drawing.Color.White;
			this.btnViewFiles.Location = new System.Drawing.Point(203, 1);
			this.btnViewFiles.Name = "btnViewFiles";
			this.btnViewFiles.Size = new System.Drawing.Size(67, 35);
			this.btnViewFiles.TabIndex = 5;
			this.btnViewFiles.Text = "&View Files";
			this.ToolTipText.SetToolTip(this.btnViewFiles, "View the searched files");
			this.btnViewFiles.Click += new System.EventHandler(this.btnViewFiles_Click);
			// 
			// btnRefresh
			// 
			this.btnRefresh.BackColor = System.Drawing.Color.Chocolate;
			this.btnRefresh.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
			this.btnRefresh.ForeColor = System.Drawing.Color.White;
			this.btnRefresh.Location = new System.Drawing.Point(70, 1);
			this.btnRefresh.Name = "btnRefresh";
			this.btnRefresh.Size = new System.Drawing.Size(67, 35);
			this.btnRefresh.TabIndex = 1;
			this.btnRefresh.Text = "&Refresh";
			this.ToolTipText.SetToolTip(this.btnRefresh, "Refresh the computer list");
			this.btnRefresh.Click += new System.EventHandler(this.btnRefresh_Click);
			// 
			// btnOpen
			// 
			this.btnOpen.BackColor = System.Drawing.Color.Chocolate;
			this.btnOpen.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
			this.btnOpen.ForeColor = System.Drawing.Color.White;
			this.btnOpen.Location = new System.Drawing.Point(3, 1);
			this.btnOpen.Name = "btnOpen";
			this.btnOpen.Size = new System.Drawing.Size(67, 35);
			this.btnOpen.TabIndex = 0;
			this.btnOpen.Text = "&Open";
			this.ToolTipText.SetToolTip(this.btnOpen, "Connect to the selected computer");
			this.btnOpen.Click += new System.EventHandler(this.btnOpen_Click);
			// 
			// lvComputers
			// 
			this.lvComputers.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
																						  this.clhComputername,
																						  this.clhIPAddress,
																						  this.clhObjects});
			this.lvComputers.Location = new System.Drawing.Point(3, 41);
			this.lvComputers.Name = "lvComputers";
			this.lvComputers.Size = new System.Drawing.Size(530, 146);
			this.lvComputers.TabIndex = 7;
			this.ToolTipText.SetToolTip(this.lvComputers, "Select a computer to connect");
			this.lvComputers.View = System.Windows.Forms.View.Details;
			this.lvComputers.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.lvComputers_KeyPress);
			this.lvComputers.DoubleClick += new System.EventHandler(this.lvComputers_DoubleClick);
			this.lvComputers.SelectedIndexChanged += new System.EventHandler(this.lvComputers_SelectedIndexChanged);
			// 
			// clhComputername
			// 
			this.clhComputername.Text = "Computername";
			this.clhComputername.Width = 222;
			// 
			// clhIPAddress
			// 
			this.clhIPAddress.Text = "IP Address";
			this.clhIPAddress.Width = 142;
			// 
			// clhObjects
			// 
			this.clhObjects.Text = "No. of Objects found";
			this.clhObjects.Width = 112;
			// 
			// lblCopyright
			// 
			this.lblCopyright.Location = new System.Drawing.Point(348, 10);
			this.lblCopyright.Name = "lblCopyright";
			this.lblCopyright.Size = new System.Drawing.Size(192, 14);
			this.lblCopyright.TabIndex = 6;
			this.lblCopyright.Text = "

						