HOWTO: Internet Transfer Control Using Username and Password

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

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

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:

   ARTICLE-ID: Q173265
   TITLE     : 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"

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"

Keywords          : PrgCtrlsStd vb5all
Technology        : kbInetDev
Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbhowto