如何使用node ftp从图像中获取二进制文件？

const ftp = require('ftp');

const client = new ftp();

client.connect({
  host: 'ftp.example.com',
  user: 'username',
  password: 'password'
});

client.on('ready', () => {
  client.get('image.jpg', (err, stream) => {
    if (err) throw err;

    let fileData = Buffer.alloc(0);

    stream.on('data', (chunk) => {
      fileData = Buffer.concat([fileData, chunk]);
    });

    stream.on('end', () => {
      console.log('Binary file retrieved successfully');
      // 在这里可以对二进制文件进行处理或保存
    });

    stream.resume();
  });
});

client.on('error', (err) => {
  console.log('FTP connection error:', err);
});