Dart

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). Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final ssh = CkSsh();

  // Hostname may be an IP address or hostname:
  final hostname = 'www.some-ssh-server.com';
  final port = 22;

  // Connect to an SSH server:
  try {
    ssh.connect(hostname, port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Wait a max of 5 seconds when reading responses..
  ssh.idleTimeoutMs = 5000;

  // Authenticate using login/password:
  try {
    ssh.authenticatePw('myLogin', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Once the SSH object is connected and authenticated, we use it
  // in our SCP object.
  final scp = CkScp();

  try {
    scp.useSsh(ssh);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  var remotePath = '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.
  final String encodedJpg;
  try {
    encodedJpg = scp.downloadBinaryEncoded(remotePath, 'base64');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  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
  try {
    scp.uploadBinaryEncoded(remotePath, encodedJpg, 'base64');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('SCP download/upload binary encoded success.');

  // Disconnect
  ssh.disconnect();
}