Visual Basic 6.0

Get Received SSH Text into a StringBuilder

Demonstrates the Chilkat Ssh.GetReceivedSb method, which decodes a channel's receive buffer and appends the text to a StringBuilder. The arguments are the channel number, the charset, and the StringBuilder. The receive buffer is cleared afterward.

Background: Because this appends rather than replaces, it is the natural choice for accumulating output across repeated reads — call it in a loop and the StringBuilder grows into the complete transcript. It also avoids creating a new string on every retrieval, which matters when a command produces a large amount of text.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Demonstrates the Ssh.GetReceivedSb method, which decodes the channel's receive buffer and
'  appends the text to a StringBuilder.  The 1st argument is the channel number, the 2nd is the
'  charset, and the 3rd is the StringBuilder.  The receive buffer is cleared afterward.

Dim ssh As New ChilkatSsh

Dim sshPort As Long
sshPort = 22
success = ssh.Connect("ssh.example.com",sshPort)
If (success = 0) Then
    Debug.Print ssh.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
password = "mySshPassword"

success = ssh.AuthenticatePw("mySshLogin",password)
If (success = 0) Then
    Debug.Print ssh.LastErrorText
    Exit Sub
End If

Dim channelNum As Long
channelNum = ssh.OpenSessionChannel()
If (channelNum < 0) Then
    Debug.Print ssh.LastErrorText
    Exit Sub
End If

success = ssh.SendReqExec(channelNum,"ls -l /tmp")
If (success = 0) Then
    Debug.Print ssh.LastErrorText
    Exit Sub
End If

'  IMPORTANT: Set a read timeout.  ReadTimeoutMs defaults to 0, which means no limit -- without
'  it, this call waits forever if the server never sends channel close.
ssh.ReadTimeoutMs = 15000

success = ssh.ChannelReceiveToClose(channelNum)
If (success = 0) Then
    Debug.Print ssh.LastErrorText
    Exit Sub
End If

'  Append the received text to a StringBuilder.  Existing content is preserved.
Dim sb As New ChilkatStringBuilder
success = ssh.GetReceivedSb(channelNum,"utf-8",sb)
If (success = 0) Then
    Debug.Print ssh.LastErrorText
    Exit Sub
End If

Debug.Print "Characters received: " & sb.Length
Dim output As String
output = sb.GetAsString()
Debug.Print output

ssh.Disconnect