Read Text at a String Offset from a Remote SFTP File

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Demonstrates the Chilkat SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the maximum number of bytes, and the charset.

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SFtp.ReadFileText64s method, which is like ReadFileText64 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 maximum number of bytes, and the 4th is the charset.

  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', 'readOnly', 'openExisting');
  } 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';
  final numBytes = 6;
  final String text;
  try {
    text = sftp.readFileText64s(handle, offset, numBytes, 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(text);

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

  sftp.disconnect();
}