Write Bytes to a Remote SFTP File (BinData)

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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.

import 'package:chilkat/chilkat.dart';

void main() {
  // 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.

  final sftp = CkSFtp();

  // Connect, authenticate, and initialize the SFTP subsystem.
  final port = 22;
  try {
    sftp.connect('sftp.example.com', port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // 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.
  final password = 'mySshPassword';

  try {
    sftp.authenticatePw('mySshLogin', password);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    sftp.initializeSftp();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Open (creating/truncating) the remote file for writing.
  final String handle;
  try {
    handle = sftp.openFile('subdir/image.png', 'writeOnly', 'createTruncate');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Put the bytes to write into a BinData.  (Here they are loaded from a local file, but the
  // bytes could come from anywhere.)
  final bd = CkBinData();
  try {
    bd.loadFile('qa_data/image.png');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Append the BinData bytes to the open remote file.
  try {
    sftp.writeFileBd(handle, bd);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    sftp.closeHandle(handle);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Wrote ${bd.numBytes} bytes.');

  sftp.disconnect();
}