dplayconnect_joinform.cs

《.NET游戏编程入门经典－c#篇》

//-----------------------------------------------------------------------------
// File: DPlayConnect_JoinForm.cs
//
// Desc: Application class for the DirectPlay samples framework.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
using System;
using System.Collections;
using System.Windows.Forms;
using System.Threading;
using System.Timers;
using Microsoft.DirectX;
using Microsoft.DirectX.DirectPlay;




/// <summary>
/// This form will search for existing running samples and allow you to join them or will
/// allow you to create your own session as a host
/// </summary>
public class CreateJoinForm : System.Windows.Forms.Form
{
	private const int EnumExpireThreshold = 2000;
	private bool amJoining = false;




	/// <summary>
	/// Hold our information of hosts we found
	/// </summary>
	private struct FindHostsResponseInformation
	{
		public int LastFoundTime;
		public ApplicationDescription ApplicationDesc;
		public int RoundTripLatencyMs;
		public Address sender;
		public Address device;
		public override string ToString()
		{
			if (ApplicationDesc.MaxPlayers > 0)
				return ApplicationDesc.SessionName + " (" + ApplicationDesc.CurrentPlayers + "/" + ApplicationDesc.MaxPlayers + ") (" + RoundTripLatencyMs + "ms)";
			else
				return ApplicationDesc.SessionName + " (" + ApplicationDesc.CurrentPlayers + ") (" + RoundTripLatencyMs + "ms)";
		}
	};

	private Peer peer;
	private ConnectWizard connectionWizard;
	private Address deviceAddress;
	private Address hostAddress = null;
	private bool isSearching = false;
	private int findHostHandle = 0;
	private CreateSessionForm createSessionForm = null;
	private ResultCode resultCode;
	private ArrayList foundHosts = new ArrayList();
	private bool isConnected = false;
	private ManualResetEvent connectEvent = null;
	private System.Timers.Timer updateListTimer = null;
	private System.Timers.Timer connectTimer = null;

	private System.Windows.Forms.ListBox lstSession;
	private System.Windows.Forms.Label label1;
	private System.Windows.Forms.Button btnCancel;
	private System.Windows.Forms.Button btnSearch;
	private System.Windows.Forms.Button btnJoin;
	private System.Windows.Forms.Button btnCreate;




	/// <summary>
	/// Constructor
	/// </summary>
	public CreateJoinForm(Peer peerObject, Address addressObject, ConnectWizard connectionWizard)
	{
		//
		// Required for Windows Form Designer support
		//
		InitializeComponent();
		peer = peerObject;
		this.connectionWizard = connectionWizard;
		this.Text = connectionWizard.SampleName + " - " + this.Text;
		deviceAddress = addressObject;
	
		//Set up the event handlers
		peer.FindHostResponse += new FindHostResponseEventHandler(FindHostResponseMessage);
		peer.ConnectComplete += new ConnectCompleteEventHandler(ConnectResult);
		peer.AsyncOperationComplete += new AsyncOperationCompleteEventHandler(CancelAsync);

		//Set up our timer
		updateListTimer = new System.Timers.Timer(300); // A 300 ms interval
		updateListTimer.Elapsed += new System.Timers.ElapsedEventHandler(this.UpdateTimer);
		updateListTimer.SynchronizingObject = this;
		updateListTimer.Start();
		//Set up our connect timer
		connectTimer = new System.Timers.Timer(100); // A 100ms interval
		connectTimer.Elapsed += new System.Timers.ElapsedEventHandler(this.ConnectTimer);
		connectTimer.SynchronizingObject = this;
		// Set up our connect event
		connectEvent = new ManualResetEvent(false);

	}




	/// <summary>
	/// An asynchronous operation was cancelled
	/// </summary>
	private void CancelAsync(object sender, AsyncOperationCompleteEventArgs e)
	{
		if (e.Message.AsyncOperationHandle == findHostHandle)
		{
			findHostHandle = 0;
			btnSearch.Text = "Start Search";
			isSearching = false;
			btnCreate.Enabled = true;
			btnSearch.Enabled = true;
		}
	}




	/// <summary>
	/// A host was found and responded to our query
	/// </summary>
	private void FindHostResponseMessage(object sender, FindHostResponseEventArgs dpMessage)
	{
		// Now we need to add this to our list of available sessions
		SessionAdd(dpMessage.Message);
	}




	/// <summary>
	/// Add this session to our list
	/// </summary>
	/// <param name="dpMessage"></param>
	private void SessionAdd(FindHostsResponseMessage dpMessage)
	{
		FindHostsResponseInformation dpInfo = new FindHostsResponseInformation();

		dpInfo.ApplicationDesc = dpMessage.ApplicationDescription;
		dpInfo.device = dpMessage.AddressDevice;
		dpInfo.sender = dpMessage.AddressSender;
		dpInfo.RoundTripLatencyMs = dpMessage.RoundTripLatencyMs;
		dpInfo.LastFoundTime = Environment.TickCount;

		// Let's check the items first and see if this one already exists
		bool isFound = false;
	
		lock (foundHosts)
		{
			for (int i = 0; i < lstSession.Items.Count; i++)
			{
				if (dpInfo.ApplicationDesc.GuidInstance == ((FindHostsResponseInformation)lstSession.Items[i]).ApplicationDesc.GuidInstance)
				{
					foundHosts[i] = dpInfo;
					lstSession.Items[i] = dpInfo;
					isFound = true;
				}
			}
			if (!isFound)
			{
				lstSession.Items.Add(dpInfo);
				foundHosts.Add(dpInfo);
			}
		}
	}




	/// <summary>
	/// Clean up any resources being used.
	/// </summary>
	protected override void Dispose(bool Disposing)
	{
		base.Dispose(Disposing);

		if (isSearching)
		{
			if (findHostHandle != 0)
				peer.CancelAsyncOperation(findHostHandle);
			isSearching = !isSearching;
		}
		if (connectTimer != null)
			connectTimer.Dispose();
	
		if (updateListTimer != null)
			updateListTimer.Dispose();
	}




	#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.btnJoin = new System.Windows.Forms.Button();
		this.lstSession = new System.Windows.Forms.ListBox();
		this.label1 = new System.Windows.Forms.Label();
		this.btnCreate = new System.Windows.Forms.Button();
		this.btnSearch = new System.Windows.Forms.Button();
		this.btnCancel = new System.Windows.Forms.Button();
		this.SuspendLayout();
		// 
		// btnJoin
		// 
		this.btnJoin.Enabled = false;
		this.btnJoin.Location = new System.Drawing.Point(7, 227);
		this.btnJoin.Name = "btnJoin";
		this.btnJoin.Size = new System.Drawing.Size(74, 27);
		this.btnJoin.TabIndex = 2;
		this.btnJoin.Text = "Join";
		this.btnJoin.Click += new System.EventHandler(this.btnJoin_Click);
		// 
		// lstSession
		// 
		this.lstSession.Location = new System.Drawing.Point(5, 37);
		this.lstSession.Name = "lstSession";
		this.lstSession.Size = new System.Drawing.Size(400, 186);
		this.lstSession.TabIndex = 1;
		this.lstSession.DoubleClick += new System.EventHandler(this.btnJoin_Click);
		this.lstSession.SelectedValueChanged += new System.EventHandler(this.SelectedChange);
		// 
		// label1
		// 
		this.label1.Location = new System.Drawing.Point(5, 13);
		this.label1.Name = "label1";
		this.label1.Size = new System.Drawing.Size(312, 16);
		this.label1.TabIndex = 0;
		this.label1.Text = "Select session to join, or click Create to start a new session.";
		// 
		// btnCreate
		// 
		this.btnCreate.DialogResult = System.Windows.Forms.DialogResult.Yes;
		this.btnCreate.Location = new System.Drawing.Point(84, 227);
		this.btnCreate.Name = "btnCreate";
		this.btnCreate.Size = new System.Drawing.Size(74, 27);
		this.btnCreate.TabIndex = 2;
		this.btnCreate.Text = "Create";
		this.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
		// 
		// btnSearch
		// 
		this.btnSearch.Location = new System.Drawing.Point(319, 7);
		this.btnSearch.Name = "btnSearch";
		this.btnSearch.Size = new System.Drawing.Size(86, 27);
		this.btnSearch.TabIndex = 2;
		this.btnSearch.Text = "Start Search";