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Q173264: HOWTO: Internet Transfer Control Using Username and Password

Article: Q173264
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:5.0,6.0
Operating System(s): 
Keyword(s): kbInternet kbVBp kbVBp500 kbVBp600 kbVS97sp1 kbInetDev kbDSupport
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Learning Edition for Windows, versions 5.0, 6.0 
- Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0 
- Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 
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SUMMARY
=======

When setting the Internet Transfer Control URL, Username, and Password
properties programmatically, the order in which you do it is very important. If
you don't set the URL property before the Username and Password properties, you
will get the following error:

  Run-time error '35754'
  Unable to connect to remote host

IMPORTANT: In the control shipped with Visual Basic 5.0 (not the Service Packs),
the Username is sent as Anonymous if the URL property is not set first
(regardless of the UserName and Password properties). So when connecting to an
FTP server, you would be accessing the URL with the Anonymous credentials, not
with the credentials you intended (according Username and Password Inet
properties).

NOTE: The Internet Transfer Control included with Visual Studio 97 Service Pack 2
is unable to make an authenticated connection using the Username and Password
properties. For more information, see the following article in the Microsoft
Knowledge Base:

  Q173265 : BUG: Internet Transfer Control (SP2) Username and Password

Workaround
----------

This is sample code for setting the URL property before the Username and Password
properties so you won't get the error described above: Inet1.URL =
"ftp://YourFTPServer" Inet1.UserName = "Username" Inet1.Password = "Password"
Notice the URL property is set before the Username and Password properties. Do
not specify the URL again in the execute method.

This information is also documented in the Visual Basic 5.0 Readme file.

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

Steps to Reproduce Behavior
---------------------------

1. Start a new Standard EXE project. Form1 is added by default.

2. From the Project menu, click Components and select the Internet Transfer
  Control 5.0 into the project if it is not already loaded.

3. Place an Internet Transfer Control 5.0 (Inet1) on Form1 and add the following
  code:

        Private Sub Inet1_StateChanged(ByVal State As Integer)
         Dim vtData As Variant ' Data variable.

         Select Case State
         ' ... Other cases not shown.
         Case icError ' 11
             ' In case of error, return ResponseCode and

        ' ResponseInfo.
             vtData = Inet1.ResponseCode & ":" & _
             Inet1.ResponseInfo

         Case icResponseCompleted  ' 12
             Dim strData As String: strData = ""
             Dim bDone As Boolean: bDone = False

             ' Get first chunk.
             vtData = Inet1.GetChunk(1024, icString)
             DoEvents

             Do While Not bDone

                 strData = strData & vtData
                 ' Get next chunk.
                 vtData = Inet1.GetChunk(1024, icString)
                 DoEvents

                 If Len(vtData) = 0 Then
                     bDone = True
                 End If
             Loop

            MsgBox strData
         End Select
        End Sub

4. Place a CommandButton (Command1) on Form1 and add the following code:

        Private Sub Command1_Click()
            Inet1.UserName = "Username"
            Inet1.Password = "Password"
            Inet1.URL = "ftp://YourFTPServer"
            Inet1.Execute , "DIR"
       End Sub

5. From the Run menu, click Start (ALT, R, S) or press the F5 key to run the
  program. Click the Command1 button, and you will see error described above.

REFERENCES
==========

Visual Basic 5.0 Readme.hlp file; search on topic: "Internet Transfer Control:
Set URL Before Password and UserName"

Additional query words:

======================================================================
Keywords          : kbInternet kbVBp kbVBp500 kbVBp600 kbVS97sp1 kbInetDev kbDSupport 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVBA500 kbVBA600 kbVB500 kbVB600
Version           : WINDOWS:5.0,6.0
Issue type        : kbhowto

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

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