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";
		this.btnSearch.Click += new System.EventHandler(this.btnSearch_Click);
		// 
		// btnCancel
		// 
		this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
		this.btnCancel.Location = new System.Drawing.Point(333, 227);
		this.btnCancel.Name = "btnCancel";
		this.btnCancel.Size = new System.Drawing.Size(74, 27);
		this.btnCancel.TabIndex = 3;
		this.btnCancel.Text = "Cancel";
		// 
		// CreateJoinForm
		// 
		this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
		this.CancelButton = this.btnCancel;
		this.ClientSize = new System.Drawing.Size(411, 264);
		this.ControlBox = false;
		this.Controls.AddRange(new System.Windows.Forms.Control[] {
																	  this.btnCreate,
																	  this.btnJoin,
																	  this.btnSearch,
																	  this.btnCancel,
																	  this.lstSession,
																	  this.label1});
		this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
		this.MaximizeBox = false;
		this.MinimizeBox = false;
		this.Name = "CreateJoinForm";
		this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
		this.Text = "Join or create a session";
		this.ResumeLayout(false);

	}
	#endregion




	/// <summary>
	/// The selected session was changed.
	/// </summary>
	private void SelectedChange(object sender, System.EventArgs e) {
		if (amJoining)
			return; // Do nothing if we are already joining a session

		btnJoin.Enabled = (lstSession.SelectedItem != null);
	}




	/// <summary>
	/// We either want to start or stop searching
	/// </summary>
	private void btnSearch_Click(object sender, System.EventArgs e) {
		if (!isSearching) {
			if( hostAddress != null )
				hostAddress.Dispose();

			hostAddress = new Address();
			hostAddress.ServiceProvider = deviceAddress.ServiceProvider;

			// See if we should prompt the user for the remote address
			if (ConnectWizard.ProviderRequiresPort(hostAddress.ServiceProvider)) {
				AddressForm addressDialog = new AddressForm(connectionWizard.DefaultPort);
				addressDialog.ShowDialog(this);

				// If the user cancelled the address form, abort the search
				if (addressDialog.DialogResult != DialogResult.OK)
					return;

				// If a port was specified, add the component
				if (addressDialog.Hostname != "")
					hostAddress.AddComponent(Address.KeyHostname, addressDialog.Hostname);
                
				// If a hostname was specified, add the component
				if (addressDialog.Port > 0)
					hostAddress.AddComponent(Address.KeyPort, addressDialog.Port);
			}

			//Time to enum our hosts
			ApplicationDescription desc = new ApplicationDescription();
			desc.GuidApplication = connectionWizard.ApplicationGuid;
		    
			// If the user was not already asked for address information, DirectPlay
			// should prompt with native UI
			FindHostsFlags flags = 0;
			if (!ConnectWizard.ProviderRequiresPort(deviceAddress.ServiceProvider))
				flags = FindHostsFlags.OkToQueryForAddressing;

			peer.FindHosts(desc,hostAddress,deviceAddress,null,Timeout.Infinite,0,Timeout.Infinite, flags, out findHostHandle);
			isSearching = true;
			btnCreate.Enabled = false;
			btnSearch.Text = "Stop Search";
		}
		else {
			btnSearch.Text = "Stopping...";
			btnSearch.Enabled = false;
			if (findHostHandle != 0)
				peer.CancelAsyncOperation(findHostHandle);
		}
	}




	/// <summary>
	/// A form was disposed
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="e"></param>
	public void FormDisposed(object sender, EventArgs e) {
		if (sender == createSessionForm)
			createSessionForm = null;
	}




	/// <summary>
	/// We should create a new session.  Display a dialog allowing the user to set
	/// certain options
	/// </summary>
	private void btnCreate_Click(object sender, System.EventArgs e) {
		this.DialogResult = DialogResult.None;
		((Button)sender).DialogResult = DialogResult.None;
		if (createSessionForm == null) {
			createSessionForm = new CreateSessionForm(peer,deviceAddress,connectionWizard);
			createSessionForm.Disposed += new System.EventHandler(this.FormDisposed);
		}
		if (createSessionForm.ShowDialog(this) != DialogResult.Cancel) {
			((Button)sender).DialogResult = DialogResult.Yes;
			this.DialogResult = DialogResult.Yes;
		}
	}




	/// <summary>
	/// Determine if we need to expire any of our currently listed servers
	/// </summary>
	private void UpdateTimer(object sender, System.Timers.ElapsedEventArgs e) {
		lock (foundHosts) {
			for (int i = 0; i< foundHosts.Count; i++) {
				// First check to see if this session has expired
				if (Environment.TickCount - ((FindHostsResponseInformation)foundHosts[i]).LastFoundTime > EnumExpireThreshold) {
					foundHosts.RemoveAt(i);
					break;
				}
			}
			for (int i = 0; i< lstSession.Items.Count; i++) {
				// First check to see if this session has expired
				if (Environment.TickCount - ((FindHostsResponseInformation)lstSession.Items[i]).LastFoundTime > EnumExpireThreshold) {
					lstSession.Items.RemoveAt(i);
					break;
				}
			}
		}
	}




	/// <summary>
	/// Wait for a connect to complete
	/// </summary>
	private void ConnectTimer(object sender, System.Timers.ElapsedEventArgs e) {
		if (connectEvent.WaitOne(0,false)) { // Wait for the Connect event to be fired
			if (isConnected) { // Are we connected?
				// Get rid of the timer
				if (updateListTimer != null)
					updateListTimer.Stop();

				if (connectTimer != null)
					connectTimer.Stop();

				this.DialogResult = DialogResult.OK;
				this.Close();
				return;
			}
			else {
				MessageBox.Show(this,"Failed to connect.  The error code was: \n" + resultCode.ToString() ,"Failed to connect",MessageBoxButtons.OK,MessageBoxIcon.Information);
				// Restart our timer
				updateListTimer.Start();
			}
		}
	}




	/// <summary>
	/// Fired when a connect complete message is received from DirectPlay.  Fire
	/// our event to notify the sample we've connected
	/// </summary>
	private void ConnectResult(object sender, ConnectCompleteEventArgs e) {
		if (e.Message.ResultCode == 0) {
			isConnected = true;
		}
		else
			isConnected = false;

		resultCode = e.Message.ResultCode;
		// Notify the timer that we've connected.
		connectEvent.Set();
	}




	/// <summary>
	/// Join an existing session
	/// </summary>
	private void btnJoin_Click(object sender, System.EventArgs e) {
		FindHostsResponseInformation dpInfo;
		if (lstSession.SelectedItem == null) {
			MessageBox.Show(this,"Please select a session before clicking join.","No session",MessageBoxButtons.OK,MessageBoxIcon.Information);
			return;
		}

		// Turn off all buttons
		btnCreate.Enabled = false;
		btnCancel.Enabled = false;
		btnJoin.Enabled = false;
		btnSearch.Enabled = false;
		amJoining = true;
		// Stop our secondary timer
		updateListTimer.Stop();
		dpInfo = ((FindHostsResponseInformation)lstSession.SelectedItem);
		connectionWizard.SetUserInfo();
		peer.Connect(dpInfo.ApplicationDesc,dpInfo.sender, dpInfo.device,null,ConnectFlags.OkToQueryForAddressing);
		// Now start our 'Connect' timer
		connectTimer.Start();
	}
}