Mega Code Archive
SMTP based on TcpClient
<![CDATA[
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
Imports System.IO
Imports System.Threading
Imports System.Windows.Forms
public class SMTPBasedOnTcpClient
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 btnSend As System.Windows.Forms.Button
Friend WithEvents lblContent As System.Windows.Forms.Label
Friend WithEvents lblSubject As System.Windows.Forms.Label
Friend WithEvents lblTo As System.Windows.Forms.Label
Friend WithEvents lblFrom As System.Windows.Forms.Label
Friend WithEvents txtTo As System.Windows.Forms.TextBox
Friend WithEvents txtContent As System.Windows.Forms.TextBox
Friend WithEvents txtSubject As System.Windows.Forms.TextBox
Friend WithEvents txtFrom As System.Windows.Forms.TextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents txtResponse As System.Windows.Forms.TextBox
Friend WithEvents lblServer As System.Windows.Forms.Label
Friend WithEvents txtServer As System.Windows.Forms.TextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.btnSend = New System.Windows.Forms.Button()
Me.lblContent = New System.Windows.Forms.Label()
Me.lblSubject = New System.Windows.Forms.Label()
Me.lblTo = New System.Windows.Forms.Label()
Me.lblFrom = New System.Windows.Forms.Label()
Me.txtTo = New System.Windows.Forms.TextBox()
Me.txtContent = New System.Windows.Forms.TextBox()
Me.txtSubject = New System.Windows.Forms.TextBox()
Me.txtFrom = New System.Windows.Forms.TextBox()
Me.Label1 = New System.Windows.Forms.Label()
Me.txtResponse = New System.Windows.Forms.TextBox()
Me.txtServer = New System.Windows.Forms.TextBox()
Me.lblServer = New System.Windows.Forms.Label()
Me.SuspendLayout()
'
'btnSend
'
Me.btnSend.Location = New System.Drawing.Point(430, 56)
Me.btnSend.Name = "btnSend"
Me.btnSend.Size = New System.Drawing.Size(133, 24)
Me.btnSend.TabIndex = 26
Me.btnSend.Text = "Send"
'
'lblContent
'
Me.lblContent.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblContent.ImageAlign = System.Drawing.ContentAlignment.MiddleRight
Me.lblContent.Location = New System.Drawing.Point(51, 125)
Me.lblContent.Name = "lblContent"
Me.lblContent.Size = New System.Drawing.Size(62, 24)
Me.lblContent.TabIndex = 25
Me.lblContent.Text = "Message"
'
'lblSubject
'
Me.lblSubject.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblSubject.ImageAlign = System.Drawing.ContentAlignment.MiddleRight
Me.lblSubject.Location = New System.Drawing.Point(51, 100)
Me.lblSubject.Name = "lblSubject"
Me.lblSubject.Size = New System.Drawing.Size(62, 12)
Me.lblSubject.TabIndex = 24
Me.lblSubject.Text = "Subjet"
'
'lblTo
'
Me.lblTo.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblTo.ImageAlign = System.Drawing.ContentAlignment.MiddleRight
Me.lblTo.Location = New System.Drawing.Point(51, 69)
Me.lblTo.Name = "lblTo"
Me.lblTo.Size = New System.Drawing.Size(62, 16)
Me.lblTo.TabIndex = 23
Me.lblTo.Text = "To"
'
'lblFrom
'
Me.lblFrom.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblFrom.ImageAlign = System.Drawing.ContentAlignment.MiddleRight
Me.lblFrom.Location = New System.Drawing.Point(51, 45)
Me.lblFrom.Name = "lblFrom"
Me.lblFrom.Size = New System.Drawing.Size(62, 16)
Me.lblFrom.TabIndex = 22
Me.lblFrom.Text = "From"
'
'txtTo
'
Me.txtTo.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtTo.Location = New System.Drawing.Point(133, 64)
Me.txtTo.Name = "txtTo"
Me.txtTo.Size = New System.Drawing.Size(256, 22)
Me.txtTo.TabIndex = 21
Me.txtTo.Text = "tim@pie.com.tw"
'
'txtContent
'
Me.txtContent.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtContent.Location = New System.Drawing.Point(133, 120)
Me.txtContent.Multiline = True
Me.txtContent.Name = "txtContent"
Me.txtContent.Size = New System.Drawing.Size(440, 48)
Me.txtContent.TabIndex = 20
Me.txtContent.Text = "This is a Test STMP Send Message "
'
'txtSubject
'
Me.txtSubject.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtSubject.Location = New System.Drawing.Point(133, 96)
Me.txtSubject.Name = "txtSubject"
Me.txtSubject.Size = New System.Drawing.Size(440, 22)
Me.txtSubject.TabIndex = 19
Me.txtSubject.Text = "SMTP Test Subject"
'
'txtFrom
'
Me.txtFrom.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtFrom.Location = New System.Drawing.Point(133, 40)
Me.txtFrom.Name = "txtFrom"
Me.txtFrom.Size = New System.Drawing.Size(256, 22)
Me.txtFrom.TabIndex = 18
Me.txtFrom.Text = "name@yourserver.com"
'
'Label1
'
Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.Label1.ImageAlign = System.Drawing.ContentAlignment.MiddleRight
Me.Label1.Location = New System.Drawing.Point(31, 184)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(92, 16)
Me.Label1.TabIndex = 28
Me.Label1.Text = "Feedback"
'
'txtResponse
'
Me.txtResponse.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtResponse.Location = New System.Drawing.Point(133, 176)
Me.txtResponse.Multiline = True
Me.txtResponse.Name = "txtResponse"
Me.txtResponse.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
Me.txtResponse.Size = New System.Drawing.Size(440, 144)
Me.txtResponse.TabIndex = 27
Me.txtResponse.Text = ""
'
'txtServer
'
Me.txtServer.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.txtServer.Location = New System.Drawing.Point(133, 8)
Me.txtServer.Name = "txtServer"
Me.txtServer.Size = New System.Drawing.Size(123, 22)
Me.txtServer.TabIndex = 29
Me.txtServer.Text = "your.server"
'
'lblServer
'
Me.lblServer.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(136, Byte))
Me.lblServer.ImageAlign = System.Drawing.ContentAlignment.MiddleRight
Me.lblServer.Location = New System.Drawing.Point(51, 12)
Me.lblServer.Name = "lblServer"
Me.lblServer.Size = New System.Drawing.Size(62, 16)
Me.lblServer.TabIndex = 30
Me.lblServer.Text = "Server"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
Me.ClientSize = New System.Drawing.Size(614, 333)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblServer, Me.txtServer, Me.Label1, Me.txtResponse, Me.btnSend, Me.lblContent, Me.lblSubject, Me.lblTo, Me.lblFrom, Me.txtTo, Me.txtContent, Me.txtSubject, Me.txtFrom})
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
Dim strResponse As String
Dim myTcpClient As New TcpClient()
Dim myNetworkStream As NetworkStream
Dim myThread As Thread
Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
myThread = New Thread(AddressOf SMTPMailProcess)
myThread.Start()
End Sub
Private Sub SMTPMailProcess()
Dim strFrom As String = txtFrom.Text
Dim strTo As String = txtTo.Text
Dim strSubject As String = txtSubject.Text
Dim strContent As String = txtContent.Text
Dim strCommand As String
Dim dteSendData() As Byte
Dim lngSize As Long
Try
myTcpClient.Connect(txtServer.Text, 25)
myNetworkStream = myTcpClient.GetStream
lngSize = myTcpClient.ReceiveBufferSize
ReDim dteSendData(lngSize)
myNetworkStream.Read(dteSendData, 0, lngSize)
strResponse += Encoding.UTF8.GetString(dteSendData) + vbCrLf
txtResponse.Text = strResponse
strCommand = "HELO " + strFrom
SMTPCommandSend(strCommand)
strCommand = "MAIL FROM: <" + strFrom + ">"
SMTPCommandSend(strCommand)
strCommand = "RCPT TO: <" + strTo + ">"
SMTPCommandSend(strCommand)
strCommand = "DATA "
SMTPCommandSend(strCommand)
strCommand = "DATE: " + Date.Now.ToString + vbCrLf + _
"FROM: " + strFrom + vbCrLf + _
"TO: " + strTo + vbCrLf + _
"SUBJECT: " + strSubject + vbCrLf + vbCrLf + _
strContent + vbCrLf + "."
SMTPCommandSend(strCommand)
strCommand = "QUIT "
SMTPCommandSend(strCommand)
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
Private Sub SMTPCommandSend(ByVal strSend As String)
Dim bteSend() As Byte
Dim bteResponse() As Byte
Try
txtResponse.Text += strSend + vbCrLf
bteSend = Encoding.ASCII.GetBytes(strSend + vbCrLf)
myNetworkStream.Write(bteSend, 0, bteSend.Length)
ReDim bteResponse(myTcpClient.ReceiveBufferSize)
myNetworkStream.Read(bteResponse, 0, bteResponse.Length)
txtResponse.Text += Encoding.UTF8.GetString(bteResponse) + vbCrLf
Catch ex As Exception
MessageBox.Show(ex.Message)
End Try
End Sub
End Class
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