React Native

Upload Bytes to an SFTP Server (BinData)

Demonstrates the Chilkat SFtp.UploadBd method, which uploads all bytes in a BinData to a remote file. The first argument is the BinData and the second is the remote file path.

Note: This example uses relative local paths, which are resolved against the application's current working directory. Absolute local paths may also be used. Supply the paths appropriate to your own environment.

Background: When the content you want to upload is already in memory — generated on the fly, decompressed, decrypted, or pulled from a database blob — UploadBd sends it directly without first writing a temporary local file. If the destination already exists it is truncated before the new bytes are written, so the result is exactly the BinData contents.

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import { BinData, SFtp } from '@chilkat/react-native'

async function chilkatExample() {
  // Demonstrates the SFtp.UploadBd method, which uploads all bytes in a BinData to a remote file.
  // The 1st argument is the BinData and the 2nd is the remote file path.

  const sftp = new SFtp();

  // Connect, authenticate, and initialize the SFTP subsystem.
  const port = 22;
  try {
    await sftp.connectAsync('sftp.example.com', port);
  } catch {
    console.log(sftp.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.
  const password = 'mySshPassword';

  try {
    await sftp.authenticatePwAsync('mySshLogin', password);
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  try {
    await sftp.initializeSftpAsync();
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // Put the bytes to upload into a BinData.  (Here they are loaded from a local file, but the
  // bytes could come from anywhere.)
  const bd = new BinData();
  try {
    bd.loadFile('qa_data/image.png');
  } catch {
    console.log(bd.lastErrorText);
    return;
  }

  // Upload the bytes.  If the remote file exists, it is truncated first.
  try {
    await sftp.uploadBdAsync(bd, 'subdir/image.png');
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  console.log(`Uploaded ${bd.numBytes} bytes.`);

  sftp.disconnect();
}