B4X

SCP Download/Upload Binary Files as Encoded Strings

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Demonstrates how to upload and download binary files as encoded strings (base64, hex, etc.) using the SCP protocol (Secure Copy Protocol over SSH). B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim ssh As ChilkatSsh
ssh.Initialize("ssh")

'  Hostname may be an IP address or hostname:
Dim hostname As String = "www.some-ssh-server.com"
Dim port As Int = 22

'  Connect to an SSH server:
success = ssh.Connect(hostname, port)
If success <> True Then
    Log(ssh.LastErrorText)
    Return
End If


'  Wait a max of 5 seconds when reading responses..
ssh.IdleTimeoutMs = 5000

'  Authenticate using login/password:
success = ssh.AuthenticatePw("myLogin", "myPassword")
If success <> True Then
    Log(ssh.LastErrorText)
    Return
End If


'  Once the SSH object is connected and authenticated, we use it
'  in our SCP object.
Dim scp As ChilkatScp
scp.Initialize("scp")

success = scp.UseSsh(ssh)
If success <> True Then
    Log(scp.LastErrorText)
    Return
End If


Dim remotePath As String = "images/starfish.jpg"

'  Download the binary file and return as a base64 string.
'  See <a href="http://www.cknotes.com/chilkat-binary-encoding-list/">List of Encodings</a> for a list of possible encodings.
Dim encodedJpg As String = scp.DownloadBinaryEncoded(remotePath, "base64")
If scp.LastMethodSuccess <> True Then
    Log(scp.LastErrorText)
    Return
End If


remotePath = "images/starfish2.jpg"

'  Now upload from the base64 string to the SSH server.
'  Insided the call to UploadBinaryEncoded, the base64 string is decoded,
'  and the decoded bytes are uploaded.  The resulting starfish2.jpg on the
'  server will be identical to the original starfish.jpg
success = scp.UploadBinaryEncoded(remotePath, encodedJpg, "base64")
If success <> True Then
    Log(scp.LastErrorText)
    Return
End If


Log("SCP download/upload binary encoded success.")

'  Disconnect
ssh.Disconnect