VB.NET

Write Bytes to a Remote SFTP File (BinData)

Demonstrates the Chilkat SFtp.WriteFileBd method, which appends all bytes in a BinData to the remote file identified by an open handle. The first argument is the handle and the second is the BinData.

Note: This example uses a relative local path, which is resolved against the application's current working directory. Absolute local paths may also be used. Supply the path appropriate to your own environment.

Background: This is the binary counterpart to WriteFileText — the right choice for images, archives, or any non-text content, where a charset conversion would corrupt the data. Combined with an appropriate OpenFile disposition it can create, overwrite, or append; here the file is created/truncated first so the result is exactly the BinData contents.

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Dim success As Boolean = False

'  Demonstrates the SFtp.WriteFileBd method, which appends all bytes in a BinData to the remote
'  file identified by an open handle.  The 1st argument is the handle and the 2nd is the BinData.

Dim sftp As New Chilkat.SFtp

'  Connect, authenticate, and initialize the SFTP subsystem.
Dim port As Integer = 22
success = sftp.Connect("sftp.example.com",port)
If (success = False) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


'  Normally you would not hard-code the password in source.  You should instead obtain it
'  from an interactive prompt, environment variable, or a secrets vault.
Dim password As String = "mySshPassword"

success = sftp.AuthenticatePw("mySshLogin",password)
If (success = False) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


success = sftp.InitializeSftp()
If (success = False) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


'  Open (creating/truncating) the remote file for writing.
Dim handle As String = sftp.OpenFile("subdir/image.png","writeOnly","createTruncate")
If (sftp.LastMethodSuccess = False) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


'  Put the bytes to write into a BinData.  (Here they are loaded from a local file, but the
'  bytes could come from anywhere.)
Dim bd As New Chilkat.BinData
success = bd.LoadFile("qa_data/image.png")
If (success = False) Then
    Debug.WriteLine(bd.LastErrorText)
    Exit Sub
End If


'  Append the BinData bytes to the open remote file.
success = sftp.WriteFileBd(handle,bd)
If (success = False) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If


success = sftp.CloseHandle(handle)
If (success = False) Then
    Debug.WriteLine(sftp.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("Wrote " & bd.NumBytes & " bytes.")

sftp.Disconnect()