DOCUMENT:Q183987  16-APR-1998  [vbwin]
TITLE   :PRB: SendData Method Generates Error 40006
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:5.0
OPER/SYS:WINDOWS
KEYWORDS:vb5all kberrmsg

======================================================================
---------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Visual Basic Professional and Enterprise Editions for
   Windows, version 5.0
---------------------------------------------------------------------

SYMPTOMS
========

If you call the SendData method in the WinSock control before the socket
has been connected, you will receive the Microsoft Visual Basic Error:

   Run-time error: 40006

   "Wrong protocol or connection state for the requested transaction or
   request."

CAUSE
=====

The code is trying to call the SendData method before the port has actually
been connected. The Connect method in Visual Basic is asynchronous and is
more like a request to connect to the Winsock port.

RESOLUTION
==========

The code must wait until the Connect event is fired before attempting to
call the SendData or GetData methods. The Connect event is a signal that
the connect request has been accepted and the connection is established.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

Steps to Reproduce and Work Around Behavior
-------------------------------------------

1. Create a new project in Visual Basic 5.0.

2. From the Projects menu, choose Components. Make sure that Microsoft
   Winsock Control 5.0 is checked, and then click the OK button.

3. Add a Winsock Control to the form and leave it named Winsock1.

4. Add a CommandButton named Command1.

5. Add the following code to the form:

      Option Explicit

      Private Sub Command1_Click()
        Winsock1.SendData "Hello World."
      End Sub

      Private Sub Form_Load()
         Command1.Enabled = False
         Winsock1.Connect InputBox$("Enter Server name:"), 7
         Command1_Click
      End Sub

      Private Sub Form_Unload(Cancel As Integer)
         Winsock1.Close
      End Sub

      Private Sub Winsock1_Connect()
         Command1.Enabled = True
      End Sub

      Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
         Dim temp As String
         temp = String(bytesTotal, Chr$(0))
         Winsock1.GetData temp, vbString, bytesTotal
         MsgBox temp
      End Sub

6. Execute the program. You should get error 40006 after entering a valid
   server name in the input box. When it fails, click on END.

7. Remove the line Command1_click from the Form_Load() sub, and run the
   program again. You should get a message box that says "Hello World."
======================================================================
Keywords          : vb5all kberrmsg
Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1998.