dplayconnect_joinform.cs

Beginning C# Game Programming 的源代码

        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();
    }
}