/* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765 */ using System; using System.IO; using System.Security; using System.Security.Cryptography; using System.Text; public class CryptoTest { public static void Main() { Console.Write("Enter phrase to encrypt: "); string phrase = Console.ReadLine(); MemoryStream memstrm = new MemoryStream(); byte[] Key = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16}; TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); CryptoStream csw = new CryptoStream(memstrm, tdes.CreateEncryptor(Key, IV), CryptoStreamMode.Write); csw.Write(Encoding.ASCII.GetBytes(phrase), 0, phrase.Length); csw.FlushFinalBlock(); byte[] cryptdata = memstrm.GetBuffer(); Console.WriteLine("Encrypted: {0}", Encoding.ASCII.GetString(cryptdata, 0, (int)memstrm.Length)); memstrm.Position = 0; byte[] data = new byte[1024]; CryptoStream csr = new CryptoStream(memstrm, tdes.CreateDecryptor(Key, IV), CryptoStreamMode.Read); int recv = csr.Read(data, 0, data.Length); string newphrase = Encoding.ASCII.GetString(data, 0, recv); Console.WriteLine("Decrypted: {0}", newphrase); csr.Close(); csw.Close(); memstrm.Close(); } }
Examine Cookies
/*
C#: The Complete Reference
by Herbert Schildt
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
/* Examine Cookies.
To see what cookies a Web Site uses,
specify its name on the command line.
For example, if you call this program
Cookie, then
Cookie http://MSN.COM
displays the cookies associated with MSN.COM.
*/
using System;
using System.Net;
public class CookieDemo {
public static void Main(string[] args) {
if(args.Length != 1) {
Console.WriteLine(“Usage: CookieDemo
return ;
}
// Create a WebRequest to the specified URI.
HttpWebRequest req = (HttpWebRequest)
WebRequest.Create(args[0]);
// Get an empty cookie container.
req.CookieContainer = new CookieContainer();
// Send the request and return the response.
HttpWebResponse resp = (HttpWebResponse)
req.GetResponse();
// Display the cookies.
Console.WriteLine(“Number of cookies: ” +
resp.Cookies.Count);
Console.WriteLine(“{0,-20}{1}”, “Name”, “Value”);
for(int i=0; i < resp.Cookies.Count; i++) Console.WriteLine("{0, -20}{1}", resp.Cookies[i].Name, resp.Cookies[i].Value); // Close the Response. resp.Close(); } } [/csharp]
Chat Application
/* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, Zach Greenvoss, Shripad Kulkarni, Neil Whitlow Publisher: Peer Information ISBN: 1861007663 */ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Net; using System.IO; using System.Net.Sockets; using System.Threading; namespace Wrox.WindowsGUIProgramming.Chapter9 { /// <summary> /// Summary description for Form1. /// </summary> public class ChatApplication : System.Windows.Forms.Form { internal System.Windows.Forms.ListBox listBox1; private System.Windows.Forms.TextBox txtMessage; private System.Windows.Forms.Button btSend; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null; private System.Windows.Forms.ComboBox cmdHost; private System.Windows.Forms.CheckBox chkSuspendClient; private PeerConnection p = null; public ChatApplication() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // p = new PeerConnection(4048, listBox1, cmdHost); } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.listBox1 = new System.Windows.Forms.ListBox(); this.txtMessage = new System.Windows.Forms.TextBox(); this.btSend = new System.Windows.Forms.Button(); this.cmdHost = new System.Windows.Forms.ComboBox(); this.chkSuspendClient = new System.Windows.Forms.CheckBox(); this.SuspendLayout(); // // listBox1 // this.listBox1.Name = "listBox1"; this.listBox1.Size = new System.Drawing.Size(688, 394); this.listBox1.TabIndex = 0; // // txtMessage // this.txtMessage.Location = new System.Drawing.Point(8, 408); this.txtMessage.Name = "txtMessage"; this.txtMessage.Size = new System.Drawing.Size(576, 20); this.txtMessage.TabIndex = 1; this.txtMessage.Text = ""; // // btSend // this.btSend.Location = new System.Drawing.Point(608, 408); this.btSend.Name = "btSend"; this.btSend.TabIndex = 2; this.btSend.Text = "Send"; this.btSend.Click += new System.EventHandler(this.btSend_Click); // // cmdHost // this.cmdHost.Location = new System.Drawing.Point(8, 432); this.cmdHost.Name = "cmdHost"; this.cmdHost.Size = new System.Drawing.Size(520, 21); this.cmdHost.TabIndex = 3; this.cmdHost.Text = "localhost"; // // chkSuspendClient // this.chkSuspendClient.Location = new System.Drawing.Point(544, 432); this.chkSuspendClient.Name = "chkSuspendClient"; this.chkSuspendClient.Size = new System.Drawing.Size(152, 24); this.chkSuspendClient.TabIndex = 4; this.chkSuspendClient.Text = "Suspend Client"; this.chkSuspendClient.CheckedChanged += new System.EventHandler(this.chkSuspendClient_CheckedChanged); // // ChatApplication // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(688, 462); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.chkSuspendClient, this.cmdHost, this.btSend, this.txtMessage, this.listBox1}); this.MaximizeBox = false; this.Name = "ChatApplication"; this.Text = "Chat!"; this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new ChatApplication()); } private void btSend_Click(object sender, System.EventArgs e) { p.Write(txtMessage.Text); } private void chkSuspendClient_CheckedChanged(object sender, System.EventArgs e) { if(chkSuspendClient.Checked==true) { p.Enabled = true; } else { p.Enabled = false; } } } public class PeerConnection { private System.Net.Sockets.TcpListener peerListener = null; private System.Net.Sockets.TcpClient peerClient = null; private System.Net.Sockets.NetworkStream netStream = null; private Thread t1 = null; private IntPtr formHandle; private int port = 0; private bool clientEnabled = true; private ListBox lb; private ComboBox cmb; public PeerConnection(int port, ListBox formHandle, ComboBox cmdHost) { this.port = port; this.lb = formHandle; this.cmb = cmdHost; t1 = new Thread(new ThreadStart(CreateListener)); t1.Name = "Listener Thread"; t1.Priority = ThreadPriority.AboveNormal; t1.Start(); } delegate void CallbackListbox(string message); void SetListboxString(string item) { lb.Items.Add(item); } private void CreateListener() { Socket tc = null; peerListener = new TcpListener(port); peerListener.Start(); CallbackListbox clb = new CallbackListbox(SetListboxString); while(true) { tc = peerListener.AcceptSocket(); byte[] byMessage = new byte[256]; Thread.Sleep(500); int iLength = tc.Receive(byMessage, 0, byMessage.Length, SocketFlags.None); if(iLength>0) { string message = System.Text.Encoding.Default.GetString(byMessage); try { if(lb.InvokeRequired) lb.Invoke(clb, new object[]{message}); } catch(Exception e) { message = e.Message; } finally { System.Diagnostics.Debug.WriteLine(message); } } } } private void CreateClient(object message) { peerClient = new TcpClient(); peerClient.Connect(cmb.SelectedText, port); netStream = peerClient.GetStream(); StreamWriter sw = new StreamWriter(netStream); sw.Write((string)message); sw.Flush(); peerClient.Close(); } internal void Write(string message) { ThreadPool.QueueUserWorkItem(new WaitCallback(CreateClient), message); } internal bool Enabled { set { if(t1.ThreadState==ThreadState.Suspended&&value==true) { t1.Resume(); } else if(t1.ThreadState!=ThreadState.Suspended&&value==false) { t1.Suspend(); } clientEnabled = value; } get { return clientEnabled; } } } }
Multicast Chat
/* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765 */ using System; using System.Drawing; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Windows.Forms; public class MulticastChat : Form { TextBox newText; ListBox results; Socket sock; Thread receiver; IPEndPoint multiep = new IPEndPoint(IPAddress.Parse("224.100.0.1"), 9050); public MulticastChat() { Text = "Multicast Chat Program"; Size = new Size(400, 380); Label label1 = new Label(); label1.Parent = this; label1.Text = "Enter text string:"; label1.AutoSize = true; label1.Location = new Point(10, 30); newText = new TextBox(); newText.Parent = this; newText.Size = new Size(200, 2 * Font.Height); newText.Location = new Point(10, 55); results = new ListBox(); results.Parent = this; results.Location = new Point(10, 85); results.Size = new Size(360, 18 * Font.Height); Button sendit = new Button(); sendit.Parent = this; sendit.Text = "Send"; sendit.Location = new Point(220,52); sendit.Size = new Size(5 * Font.Height, 2 * Font.Height); sendit.Click += new EventHandler(ButtonSendOnClick); Button closeit = new Button(); closeit.Parent = this; closeit.Text = "Close"; closeit.Location = new Point(290, 52); closeit.Size = new Size(5 * Font.Height, 2 * Font.Height); closeit.Click += new EventHandler(ButtonCloseOnClick); sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050); sock.Bind(iep); sock.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("224.100.0.1"))); receiver = new Thread(new ThreadStart(packetReceive)); receiver.IsBackground = true; receiver.Start(); } void ButtonSendOnClick(object obj, EventArgs ea) { byte[] message = Encoding.ASCII.GetBytes(newText.Text); newText.Clear(); sock.SendTo(message, SocketFlags.None, multiep); } void ButtonCloseOnClick(object obj, EventArgs ea) { receiver.Abort(); sock.Close(); Close(); } void packetReceive() { EndPoint ep = (EndPoint)multiep; byte[] data = new byte[1024]; string stringData; int recv; while (true) { recv = sock.ReceiveFrom(data, ref ep); stringData = Encoding.ASCII.GetString(data, 0, recv); results.Items.Add("from " + ep.ToString() + ": " + stringData); } } public static void Main() { Application.Run(new MulticastChat()); } }
New Tcp Chat
/* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765 */ using System; using System.Drawing; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Windows.Forms; public class NewTcpChat : Form { private static TextBox newText; private static ListBox results; private static ListBox hosts; private static Socket client; private static byte[] data = new byte[1024]; public NewTcpChat() { Text = "New TCP Chat Program"; Size = new Size(400, 380); Label label1 = new Label(); label1.Parent = this; label1.Text = "Enter text string:"; label1.AutoSize = true; label1.Location = new Point(10, 30); newText = new TextBox(); newText.Parent = this; newText.Size = new Size(200, 2 * Font.Height); newText.Location = new Point(10, 55); results = new ListBox(); results.Parent = this; results.Location = new Point(10, 85); results.Size = new Size(360, 10 * Font.Height); Label label2 = new Label(); label2.Parent = this; label2.Text = "Active hosts"; label2.AutoSize = true; label2.Location = new Point(10, 240); hosts = new ListBox(); hosts.Parent = this; hosts.Location = new Point(10, 255); hosts.Size = new Size(360, 5 * Font.Height); Button sendit = new Button(); sendit.Parent = this; sendit.Text = "Send"; sendit.Location = new Point(220,52); sendit.Size = new Size(5 * Font.Height, 2 * Font.Height); sendit.Click += new EventHandler(ButtonSendOnClick); Button connect = new Button(); connect.Parent = this; connect.Text = "Connect"; connect.Location = new Point(295, 20); connect.Size = new Size(6 * Font.Height, 2 * Font.Height); connect.Click += new EventHandler(ButtonConnectOnClick); Button listen = new Button(); listen.Parent = this; listen.Text = "Listen"; listen.Location = new Point(295,52); listen.Size = new Size(6 * Font.Height, 2 * Font.Height); listen.Click += new EventHandler(ButtonListenOnClick); Thread fh = new Thread(new ThreadStart(findHosts)); fh.IsBackground = true; fh.Start(); } void ButtonListenOnClick(object obj, EventArgs ea) { results.Items.Add("Listening for a client..."); Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050); newsock.Bind(iep); newsock.Listen(5); newsock.BeginAccept(new AsyncCallback(AcceptConn), newsock); Thread advertise = new Thread(new ThreadStart(srvrAdvertise)); advertise.IsBackground = true; advertise.Start(); } void ButtonConnectOnClick(object obj, EventArgs ea) { results.Items.Add("Connecting..."); client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); string selectedhost = (string)hosts.SelectedItem; string[] hostarray = selectedhost.Split(':'); IPEndPoint iep = new IPEndPoint(IPAddress.Parse(hostarray[1]), 9050); client.BeginConnect(iep, new AsyncCallback(Connected), client); } void ButtonSendOnClick(object obj, EventArgs ea) { byte[] message = Encoding.ASCII.GetBytes(newText.Text); newText.Clear(); client.BeginSend(message, 0, message.Length, 0, new AsyncCallback(SendData), client); } void AcceptConn(IAsyncResult iar) { Socket oldserver = (Socket)iar.AsyncState; client = oldserver.EndAccept(iar); results.Items.Add("Connection from: " + client.RemoteEndPoint.ToString()); Thread receiver = new Thread(new ThreadStart(ReceiveData)); receiver.IsBackground = true; receiver.Start(); } void Connected(IAsyncResult iar) { try { client.EndConnect(iar); results.Items.Add("Connected to: " + client.RemoteEndPoint.ToString()); Thread receiver = new Thread(new ThreadStart(ReceiveData)); receiver.IsBackground = true; receiver.Start(); } catch (SocketException) { results.Items.Add("Error connecting"); } } void SendData(IAsyncResult iar) { Socket remote = (Socket)iar.AsyncState; int sent = remote.EndSend(iar); } void ReceiveData() { int recv; string stringData; while (true) { recv = client.Receive(data); stringData = Encoding.ASCII.GetString(data, 0, recv); if (stringData == "bye") break; results.Items.Add(stringData); } stringData = "bye"; byte[] message = Encoding.ASCII.GetBytes(stringData); client.Send(message); client.Close(); results.Items.Add("Connection stopped"); return; } void srvrAdvertise() { Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1); IPEndPoint iep = new IPEndPoint(IPAddress.Broadcast, 9051); byte[] hostname = Encoding.ASCII.GetBytes(Dns.GetHostName()); while (true) { server.SendTo(hostname, iep); Thread.Sleep(60000); } } void findHosts() { while(true) { Socket remoteHosts = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9051); EndPoint ep = (EndPoint)iep; remoteHosts.Bind(iep); byte[] data = new byte[1024]; int recv = remoteHosts.ReceiveFrom(data, ref ep); string stringData = Encoding.ASCII.GetString(data, 0, recv); string entry = stringData + ":" + ep.ToString(); if (!hosts.Items.Contains(entry)) hosts.Items.Add(entry); } } public static void Main() { Application.Run(new NewTcpChat()); } }
Tcp Chat
/* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765 */ using System; using System.Drawing; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Windows.Forms; public class TcpChat : Form { private static TextBox newText; private static ListBox results; private static Socket client; private static byte[] data = new byte[1024]; public TcpChat() { Text = "TCP Chat Program"; Size = new Size(400, 380); Label label1 = new Label(); label1.Parent = this; label1.Text = "Enter text string:"; label1.AutoSize = true; label1.Location = new Point(10, 30); newText = new TextBox(); newText.Parent = this; newText.Size = new Size(200, 2 * Font.Height); newText.Location = new Point(10, 55); results = new ListBox(); results.Parent = this; results.Location = new Point(10, 85); results.Size = new Size(360, 18 * Font.Height); Button sendit = new Button(); sendit.Parent = this; sendit.Text = "Send"; sendit.Location = new Point(220,52); sendit.Size = new Size(5 * Font.Height, 2 * Font.Height); sendit.Click += new EventHandler(ButtonSendOnClick); Button connect = new Button(); connect.Parent = this; connect.Text = "Connect"; connect.Location = new Point(295, 20); connect.Size = new Size(6 * Font.Height, 2 * Font.Height); connect.Click += new EventHandler(ButtonConnectOnClick); Button listen = new Button(); listen.Parent = this; listen.Text = "Listen"; listen.Location = new Point(295,52); listen.Size = new Size(6 * Font.Height, 2 * Font.Height); listen.Click += new EventHandler(ButtonListenOnClick); } void ButtonListenOnClick(object obj, EventArgs ea) { results.Items.Add("Listening for a client..."); Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050); newsock.Bind(iep); newsock.Listen(5); newsock.BeginAccept(new AsyncCallback(AcceptConn), newsock); } void ButtonConnectOnClick(object obj, EventArgs ea) { results.Items.Add("Connecting..."); client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050); client.BeginConnect(iep, new AsyncCallback(Connected), client); } void ButtonSendOnClick(object obj, EventArgs ea) { byte[] message = Encoding.ASCII.GetBytes(newText.Text); newText.Clear(); client.BeginSend(message, 0, message.Length, 0, new AsyncCallback(SendData), client); } void AcceptConn(IAsyncResult iar) { Socket oldserver = (Socket)iar.AsyncState; client = oldserver.EndAccept(iar); results.Items.Add("Connection from: " + client.RemoteEndPoint.ToString()); Thread receiver = new Thread(new ThreadStart(ReceiveData)); receiver.Start(); } void Connected(IAsyncResult iar) { try { client.EndConnect(iar); results.Items.Add("Connected to: " + client.RemoteEndPoint.ToString()); Thread receiver = new Thread(new ThreadStart(ReceiveData)); receiver.Start(); } catch (SocketException) { results.Items.Add("Error connecting"); } } void SendData(IAsyncResult iar) { Socket remote = (Socket)iar.AsyncState; int sent = remote.EndSend(iar); } void ReceiveData() { int recv; string stringData; while (true) { recv = client.Receive(data); stringData = Encoding.ASCII.GetString(data, 0, recv); if (stringData == "bye") break; results.Items.Add(stringData); } stringData = "bye"; byte[] message = Encoding.ASCII.GetBytes(stringData); client.Send(message); client.Close(); results.Items.Add("Connection stopped"); return; } public static void Main() { Application.Run(new TcpChat()); } }
Using CDO
/* * C# Programmers Pocket Consultant * Author: Gregory S. MacBeth * Email: gmacbeth@comporium.net * Create Date: June 27, 2003 * Last Modified Date: * Version: 1 */ using System; using CDO; using ADODB; namespace Client.Chapter_19___Office_Integration { public class UsingCDOEx { static void Main(string[] args) { Message MyMessage = new MessageClass(); Configuration MyConfig = MyMessage.Configuration; Fields MyFields = MyConfig.Fields; MyFields[@"http://schemas.microsoft.com/cdo/configuration/sendusing"].Value = 2; MyFields[@"http://schemas.microsoft.com/cdo/configuration/smtpserverport"].Value = 25; MyFields[@"http://schemas.microsoft.com/cdo/configuration/smtpserver"].Value = "smarthost"; MyFields.Update(); MyMessage.Configuration = MyConfig; MyMessage.TextBody = "This is a test message"; MyMessage.Subject = "Testing"; MyMessage.From = "gregmcb@microsoft.com"; MyMessage.To = "pmacbeth@comporium.com"; MyMessage.Send(); } } }