Imports System.Net.Sockets
Imports System.Net
Imports System.Threading
Imports System.Text
Imports System.Windows.Forms
public class UsingAsyncSocketServer
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Inherits System.Windows.Forms.Form
Public Sub New()
MyBase.New()
InitializeComponent()
End Sub
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
Private components As System.ComponentModel.IContainer
Friend WithEvents btnListener As System.Windows.Forms.Button
Friend WithEvents lblConnection As System.Windows.Forms.Label
Friend WithEvents lblPort As System.Windows.Forms.Label
Friend WithEvents txtPort As System.Windows.Forms.TextBox
Friend WithEvents btnClose As System.Windows.Forms.Button
Friend WithEvents btnReceive As System.Windows.Forms.Button
Friend WithEvents txtMessage As System.Windows.Forms.TextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents btnSend As System.Windows.Forms.Button
Friend WithEvents txtAccept As System.Windows.Forms.TextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.btnListener = New System.Windows.Forms.Button()
Me.lblConnection = New System.Windows.Forms.Label()
Me.lblPort = New System.Windows.Forms.Label()
Me.txtPort = New System.Windows.Forms.TextBox()
Me.btnClose = New System.Windows.Forms.Button()
Me.btnReceive = New System.Windows.Forms.Button()
Me.txtMessage = New System.Windows.Forms.TextBox()
Me.txtAccept = New System.Windows.Forms.TextBox()
Me.Label1 = New System.Windows.Forms.Label()
Me.btnSend = New System.Windows.Forms.Button()
Me.SuspendLayout()
'
'btnListener
'
Me.btnListener.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.btnListener.Location = New System.Drawing.Point(338, 24)
Me.btnListener.Name = "btnListener"
Me.btnListener.Size = New System.Drawing.Size(113, 32)
Me.btnListener.TabIndex = 0
Me.btnListener.Text = "Start"
'
'lblConnection
'
Me.lblConnection.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblConnection.Location = New System.Drawing.Point(41, 72)
Me.lblConnection.Name = "lblConnection"
Me.lblConnection.Size = New System.Drawing.Size(92, 24)
Me.lblConnection.TabIndex = 2
Me.lblConnection.Text = "Info"
'
'lblPort
'
Me.lblPort.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblPort.Location = New System.Drawing.Point(20, 32)
Me.lblPort.Name = "lblPort"
Me.lblPort.Size = New System.Drawing.Size(113, 24)
Me.lblPort.TabIndex = 3
Me.lblPort.Text = "Port"
'
'txtPort
'
Me.txtPort.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtPort.Location = New System.Drawing.Point(143, 24)
Me.txtPort.Name = "txtPort"
Me.txtPort.Size = New System.Drawing.Size(133, 26)
Me.txtPort.TabIndex = 4
Me.txtPort.Text = "36000"
'
'btnClose
'
Me.btnClose.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.btnClose.Location = New System.Drawing.Point(461, 24)
Me.btnClose.Name = "btnClose"
Me.btnClose.Size = New System.Drawing.Size(102, 32)
Me.btnClose.TabIndex = 5
Me.btnClose.Text = "Stop"
'
'btnReceive
'
Me.btnReceive.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.btnReceive.Location = New System.Drawing.Point(276, 248)
Me.btnReceive.Name = "btnReceive"
Me.btnReceive.Size = New System.Drawing.Size(175, 32)
Me.btnReceive.TabIndex = 6
Me.btnReceive.Text = "Receive"
'
'txtMessage
'
Me.txtMessage.Location = New System.Drawing.Point(143, 72)
Me.txtMessage.Multiline = True
Me.txtMessage.Name = "txtMessage"
Me.txtMessage.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
Me.txtMessage.Size = New System.Drawing.Size(430, 88)
Me.txtMessage.TabIndex = 7
Me.txtMessage.Text = ""
'
'txtAccept
'
Me.txtAccept.Location = New System.Drawing.Point(143, 168)
Me.txtAccept.Multiline = True
Me.txtAccept.Name = "txtAccept"
Me.txtAccept.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
Me.txtAccept.Size = New System.Drawing.Size(430, 64)
Me.txtAccept.TabIndex = 9
Me.txtAccept.Text = ""
'
'Label1
'
Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.Label1.Location = New System.Drawing.Point(10, 168)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(144, 24)
Me.Label1.TabIndex = 8
Me.Label1.Text = "Data"
'
'btnSend
'
Me.btnSend.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.btnSend.Location = New System.Drawing.Point(461, 248)
Me.btnSend.Name = "btnSend"
Me.btnSend.Size = New System.Drawing.Size(112, 32)
Me.btnSend.TabIndex = 10
Me.btnSend.Text = "Data sent back"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(665, 309)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnSend, Me.txtAccept, Me.Label1, Me.txtMessage, Me.btnReceive, Me.btnClose, Me.txtPort, Me.lblPort, Me.lblConnection, Me.btnListener})
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
Dim strMessage
Dim myListener As Socket
Dim bteAccept(65536) As Byte
Dim bteSend(65536) As Byte
Dim EndSocket As Socket
Private Sub btnListener_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListener.Click
Dim myThread As New Thread(New ThreadStart(AddressOf StartListen))
myThread.Start()
End Sub
Private Sub btnReceive_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReceive.Click
Dim myThread As New Thread(New ThreadStart(AddressOf ReceiveStart))
myThread.Start()
End Sub
Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
Dim myThread As New Thread(New ThreadStart(AddressOf SendStart))
myThread.Start()
End Sub
Private Sub StartListen()
Dim intPort As Integer
Dim bidEndPoint As IPEndPoint
intPort = Integer.Parse(txtPort.Text)
bidEndPoint = New IPEndPoint(IPAddress.Parse("10.2.3.127"), intPort)
myListener = New Socket _
(AddressFamily.InterNetwork, _
SocketType.Stream, _
ProtocolType.Tcp)
Try
' myListener.Bind(bidEndPoint)
Dim myAsyncCallBack As New AsyncCallback(AddressOf AcceptEnd)
myListener.Listen(intPort)
myListener.BeginAccept(myAsyncCallBack, myListener)
txtMessage.Text += vbCrLf + "Waiting"
strMessage += "//Head..." + vbCrLf
strMessage += "//Server Send Message ..." + vbCrLf
strMessage += "--------------------------------" + vbCrLf
Catch ex As SocketException
Console.WriteLine(ex.Message)
End Try
End Sub
Private Sub AcceptEnd(ByVal pIAsyncResult As IAsyncResult)
EndSocket = myListener.EndAccept(pIAsyncResult)
End Sub
Private Sub ReceiveStart()
Dim myAsyncCallBack As New AsyncCallback(AddressOf ReceiveData)
EndSocket.BeginReceive _
(bteAccept, 0, 65536, 0, _
myAsyncCallBack, EndSocket)
End Sub
Private Sub ReceiveData(ByVal pIAsyncResult As IAsyncResult)
Dim intByte As Integer
intByte = EndSocket.EndReceive(pIAsyncResult)
If intByte > 0 Then
strMessage += Encoding.ASCII.GetString(bteAccept)
txtAccept.Text = strMessage
End If
End Sub
Private Sub SendStart()
Dim myAsyncCallBack As New AsyncCallback(AddressOf SendData)
bteSend = Encoding.ASCII.GetBytes(strMessage)
EndSocket.BeginSend _
(bteSend, 0, bteSend.Length, _
SocketFlags.DontRoute, myAsyncCallBack, EndSocket)
End Sub
Private Sub SendData(ByVal pIAsyncResult As IAsyncResult)
Dim intSend As Integer
intSend = EndSocket.EndSend(pIAsyncResult)
txtMessage.Text += vbCrLf + "Data sent " + intSend.ToString + "bytes"
End Sub
Private Sub btnClose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClose.Click
myListener.Close()
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
End Class
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