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VB HTML Mail via SMTP


Visual Basic 6, or VB Classic

It's a function that allows you to send an e-mail with both HTML and Plain Text formats, using the Winsock control. It's an enhancement to Brian Anderson's code.

Original Author: Pablo Cuadrado

Inputs

SourceForm, DestAddress, Server, Optional BodyHTML, Optional BodyTXT, Optional SenderName, Optional SenderAddress, Optional DestName, Optional Subject.

Assumptions

You gotta have a Winsock control or create an instance of it.

Returns

SMTP Errors, status codes.

Side Effects

None.

API Declarations

' A global variable.
Public Response As String

Code

' Did you declare the global variable:
' Public Response As String ?
Dim Start As Single, Tmr As Single
Public Sub HTMLMail(Server As String, SourceForm As Form, DestAddress As String, BodyHTML As String, Optional BodyTXT As String = "", Optional SenderName As String = "", Optional SenderAddress As String = "", Optional DestName As String = "", Optional Subject As String = "")
' HTMLMail
' by Pablo Cuadrado - Argentina
' Estudio Quadra - Innovating the Internet
'
' Created on Friday, October 15th, 2004.
'
' Uses Winsock object to connect to a SMTP server.
'
' I have seen a lot of answers on how to do more
' than sending a plain text mail on a code posted
' by Brian Anderson. Well, this is is a Multipart
' mail, so you can send even more things.
'
' I've made a class which allows you to create
' multipart mails, contact me if you wish to have
' it. This is just a simple FUNCTION, that allows
' a "Bi-part" mail, with both a plain text and a
' HTML message embedded.
'
' By getting the right MIME types, you can embed
' anything (pics, files, etc.) on an e-mail.
'
' There is a SourceForm parameter:
' you can call the function in a form with a Winsock
' control, just by adding, for instance:
' ...Command1_Click ()
' HTMLMail "smtp.myserver.com", Me, ... and so on.
'
' The keyword "Me" is the form object itself.
' I did this in a project with more than one Winsock control.
' You may delete that parameter, and then in the line:
' With SourceForm.Winsock
' Just specify wich control will you use.
Dim Header(40) As String
Dim i As Integer
Dim StatusOutput As String
Dim Headers As String
Dim MIMEDate As String, MIMEHeaders As String
With SourceForm.SCWinsock
If .State = sckClosed Then
MIMEDate = Format(Date, "Ddd") & ", " & Format(Date, "dd Mmm YYYY") & " " & Format(Time, "hh:mm:ss") & "" & " -0600"
Header(1) = "mail from: " & Chr(32) & SenderAddress & vbCrlf
Header(2) = "rcpt to: " & DestAddress & vbCrlf
Header(3) = "Date: " & MIMEDate & vbCrlf
Header(4) = "From: """ & SenderName & """ <" & SenderAddress & ">" + vbCrlf
Header(5) = "To: " & DestName & vbCrlf
Header(6) = "Subject: " & Subject & vbCrlf
Header(7) = "MIME-Version: 1.0" & vbCrlf
Header(8) = "Content-Type: multipart/alternative;" & vbCrlf

' Here is the trick: you make a string (boundary) that divides the parts.
Header(9) = " boundary = " & Chr(34) & "----=Division" & Chr(34) & ";" & vbCrlf
Header(10) = "X-Mailer: YourApp" & vbCrlf

' The order for the headers:
' From - Date - MimeHeaders - X-Headers - To - Subject

MIMEHeaders = Header(7) & Header(8) & Header(9)
Headers = Header(4) & Header(3) & MIMEHeaders & Header(10) & Header(5) & Header(6)

' Plain Text Part
' ===============
'
' The division goes with the prefix "--"
' Many programs uses strings starting with "-" to make a visible line.
' M$ Outlook does.
Header(11) = "------=Division"
Header(12) = "Content-Type: text/plain;"
Header(13) = " charset = " & Chr(34) & "iso-8859-1" & Chr(34) & ";"
Header(14) = vbCrlf & vbCrlf
Header(15) = BodyTXT & vbCrlf ' Cuerpo

' HTML Text Part
' ==============

Header(16) = "------=Division"
Header(17) = "Content-Type: text/html;"
Header(18) = " charset = " & Chr(34) & "iso-8859-1" & Chr(34)
Header(19) = "Content-Transfer-Encoding: quoted-printable" & vbCrlf
' Remove the header to ensure HTML compatibility.
'Header(19) = vbCrlf
Header(20) = BodyHTML & vbCrlf ' Cuerpo


' The last division hast both an "--" prefix, and a "--" suffix.
Header(21) = "------=Division--" & vbCrlf
  
.LocalPort = 0
.Protocol = sckTCPProtocol
.RemoteHost = Server
.RemotePort = 25
.Connect

WaitFor ("220")
StatusOutput = "Connecting..."
' Whenever there's an StatusOutput, you could
' point it to a text or label on your app to
' create a visible status.

.SendData ("HELO " & Server & vbCrlf)

WaitFor ("250")
StatusOutput = "Connected..."

' First command (mail from)
.SendData (Header(1))
StatusOutput = "Sending..."
WaitFor ("250")

' Second (rcpt to)
.SendData (Header(2))
WaitFor ("250")
.SendData ("data" & vbCrlf)
WaitFor ("354")

' The rest
.SendData Headers & vbCrlf
  
' This line is often found on MIME messages.
.SendData "This is a multi-part message in MIME format." & vbCrlf

.SendData vbCrlf

For i = 11 To 20
  .SendData (Header(i) & vbCrlf)
Next i
.SendData (Header(21) & vbCrlf)

' Terminate
.SendData ("." & vbCrlf)
WaitFor ("250")

' Quit
.SendData ("quit" & vbCrlf)

StatusOutput = "Unconnected..."
WaitFor ("221")
.Close

StatusOutput = ""
Else
Select Case .State
  Case 1
  StatusOutput = "Socket Opened."
  Case 2
  StatusOutput = "Listening..."
  Case 3
  StatusOutput = "Connection pending"
  Case 4
  StatusOutput = "Resolving host"
  Case 5
  StatusOutput = "Host resolved"
  Case 6
  StatusOutput = "Connecting"
  Case 7
  StatusOutput = "Connected"
  Case 8
  StatusOutput = "The point is closing the connection."
  Case 9
  StatusOutput = "Error."
  Case Else
  StatusOutput = "Undefined."
End Select
' Just a box in case anything happens.
MsgBox (StatusOutput)
End If
End With
End Sub
Sub WaitFor(ResponseCode As String)
Start = Timer
While Len(Response) = 0
Tmr = Start - Timer
DoEvents
If Tmr > 50 Then
  MsgBox "SMTP service error, timed out while waiting for response", 64, "Error!"
  Exit Sub
End If
Wend
While Left(Response, 3) <> ResponseCode
DoEvents
If Tmr > 50 Then
  MsgBox "SMTP service error, impromper response code. Code should have been: " + ResponseCode + " Code recieved: " + Response, 64, "Error"
  Exit Sub
End If
Wend
Response = ""
End Sub
'
' The following code goes wherever the Winsock
' control is placed.
'
Private Sub SCWinsock_DataArrival(ByVal bytesTotal As Long)
SCWinsock.GetData Response
End Sub

About this post

Posted: 2003-06-01
By: ArchiveBot
Viewed: 121 times

Categories

Visual Basic 6

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