How To Use NT Simple TCP/IP Services for Winsock Testing

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Article ID: 177699 - View products that this article applies to.
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SUMMARY

Windows NT has a Simple TCP/IP Services service that can be used to test applications that use the Winsock API and/or the Winsock Control. Rather than having to create both a client and server in Visual Basic, you can test the client against this service.

A list of well-known ports available through this service can be found on an NT machine in the text document C:\WINNT\SYSTEM32\DRIVERS\ETC\SERVICES.

MORE INFORMATION

The following sample describes how to use the Microsoft Winsock Control that shipped with Visual Basic to call the Echo service and the Quote Service.

Verify that Simple TCP/IP Services is Running

Check to see if you can contact the server you are trying to attach to by running Ping <servername> at the command prompt. If the server responds, go to the control panel on the server and start the Services icon. Check the list that comes up for Simple TCP/IP Services.

The Simple TCP/IP Services service must be running for these samples to work correctly. If Simple TCP/IP Services is not listed, double-click Network in the Control Panel.

In Windows NT 3.51, click Add Software, choose TCP/IP Protocol and related components, and click OK. In the dialog box that appears, click Simple TCP/IP Services and click OK.

In Windows NT 4.0, click Add, choose Simple TCP/IP Services, and click OK.

The install program may ask you to provide the path to the Windows NT installation CD-ROM and will require that you restart the computer when it is finished.

Using the Echo Service

  1. Create a new Standard EXE project in Visual Basic.
  2. From the Projects menu, choose Components. Make sure that Microsoft Winsock Control is checked and click OK.
  3. Add a Winsock Control to the form and leave it named Winsock1.
  4. Add three CommandButtons named cmdConnect, cmdEcho, and cmdDisconnect, and then change the captions to Connect, Echo and Disconnect, respectively.
  5. Add two text boxes and leave them named Text1 and Text2, but change the MultiLine property on each to True.
  6. Add the following code to the form:
          Option Explicit
          Const EchoPort = 7
    
          Private Sub cmdConnect_Click()
             Dim temp As String
             temp = InputBox$("Enter a server name...", _
                    "Connect to the Echo Service", Winsock1.RemoteHost)
             If temp <> "" Then
             If Winsock1.State <> sckClosed Then Winsock1.Close
                Winsock1.RemoteHost = temp
                Winsock1.RemotePort = EchoPort
                Winsock1.LocalPort = 0
                Winsock1.Connect
             End If
          End Sub
    
          Private Sub cmdDisconnect_Click()
             If Winsock1.State <> sckClosed Then Winsock1.Close
             cmdConnect.Enabled = True
             cmdDisconnect.Enabled = False
             cmdConnect.SetFocus
          End Sub
    
          Private Sub cmdEcho_Click()
             Winsock1.SendData Text1.Text
             cmdEcho.Enabled = False
          End Sub
    
          Private Sub Winsock1_Close()
             If Winsock1.State <> 0 Then Winsock1.Close
          End Sub
    
          Private Sub Winsock1_Connect()
             cmdConnect.Enabled = False
             cmdEcho.Enabled = True
             cmdDisconnect.Enabled = True
          End Sub
    
          Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
    
             Dim temp As String
             temp = String(bytesTotal, "*")
             Winsock1.GetData temp, vbString, bytesTotal
             Text2.Text = temp
             cmdEcho.Enabled = True
          End Sub
    
          Private Sub Winsock1_Error(ByVal Number As Integer, _
                                     Description As String, _
                                     ByVal Scode As Long, _
                                     ByVal Source As String, _
                                     ByVal HelpFile As String, _
                                     ByVal HelpContext As Long, _
                                     CancelDisplay As Boolean)
             MsgBox "Error: " & Number & vbTab & Description, vbOKOnly, _
                    "Winsock Control 1 Error"
             CancelDisplay = True
          End Sub
    
    					

Using the Quote and Time Services

  1. Create a new STANDARD EXE project in Visual Basic.
  2. From the Projects menu, choose Components. Make sure that Microsoft Winsock Control is checked and then click OK.
  3. Add a Winsock Control to the form and leave it named Winsock1.
  4. Add two CommandButtons named cmdQuote and cmdTime, then change the captions to Quote and Time, respectively.
  5. Add a text box and leave it named Text1, but change the MultiLine property on it to True.
  6. Add the following code to the form:
          Const TimePort = 13, QuotePort = 17
          Private Sub cmdQuote_Click()
             Dim temp As String
             temp = InputBox$("Enter a server name...", _
                              "Get a Quote", Winsock1.RemoteHost)
             If temp <> "" Then
                If Winsock1.State <> sckClosed Then Winsock1.Close
                Winsock1.RemoteHost = temp
                Winsock1.RemotePort = QuotePort
                Winsock1.LocalPort = 0
                Winsock1.Connect
             End If
          End Sub
    
          Private Sub cmdTime_Click()
             Dim temp As String
             temp = InputBox$("Enter a server name...", _
                              "Get the time", Winsock1.RemoteHost)
             If temp <> "" Then
                If Winsock1.State <> sckClosed Then Winsock1.Close
                Winsock1.RemoteHost = temp
                Winsock1.RemotePort = TimePort
                Winsock1.LocalPort = 0
                Winsock1.Connect
             End If
          End Sub
    
          Private Sub Winsock1_Close()
             If Winsock1.State <> 0 Then Winsock1.Close
          End Sub
    
          Private Sub Winsock1_Connect()
             Beep
          End Sub
    
          Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
             Dim temp As String
             temp = String(bytesTotal, " ")
             Winsock1.GetData temp, vbString, bytesTotal
             Text1.Text = temp
          End Sub
    
          Private Sub Winsock1_Error(ByVal Number As Integer, _
                            Description As String, _
                            ByVal Scode As Long, _
                            ByVal Source As String, _
                            ByVal HelpFile As String, _
                            ByVal HelpContext As Long, _
                            CancelDisplay As Boolean)
             MsgBox "Error: " & Number & vbTab & Description, _
                    vbOKOnly, "Winsock Control 2 Error"
             CancelDisplay = True
          End Sub
    
    					

Properties

Article ID: 177699 - Last Review: July 11, 2005 - Revision: 1.2
APPLIES TO
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 6.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Platform Software Development Kit-January 2000 Edition
Keywords: 
kbhowto kbwinsock kbapi kbnetwork KB177699

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