Write Text at a String Offset in a Remote SFTP File

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Demonstrates the Chilkat SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the charset, and the text.

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the
  // byte offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string,
  // the 3rd is the charset, and the 4th is the text.

  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;
  }

  final String handle;
  try {
    handle = sftp.openFile('subdir/hugefile.dat', 'readWrite', 'openOrCreate');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Supplying the offset as a string is convenient in languages without a native 64-bit integer.
  final offset = '5000000000';
  try {
    sftp.writeFileText64s(handle, offset, 'utf-8', 'MARKER');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  print('Wrote at the string offset.');

  sftp.disconnect();
}