Collect Completed SSH Commands with QuickCmdCheck

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Demonstrates the Chilkat Ssh.QuickCmdCheck method, which waits for any command started by QuickCmdSend to complete. The only argument is the poll timeout in milliseconds; 0 performs a nonblocking check. It returns the channel number of a completed command, -1 when commands are still pending but none finished before the timeout, or -2 when no quick commands remain or an error occurred.

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  Demonstrates the Ssh.QuickCmdCheck method, which waits for any command started by
    //  QuickCmdSend to complete.  The only argument is the poll timeout in milliseconds; 0 performs
    //  a nonblocking check.

    CkSsh ssh = new CkSsh();

    int sshPort = 22;
    success = ssh.Connect("ssh.example.com",sshPort);
    if (success == false) {
        Log.i(TAG, ssh.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.
    String password = "mySshPassword";

    success = ssh.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  Start two commands that will finish at different times.
    int channel1 = ssh.QuickCmdSend("sleep 2; echo first done");
    if (channel1 < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    int channel2 = ssh.QuickCmdSend("echo second done");
    if (channel2 < 0) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  Collect the results as they complete.  The return value is the channel number of a completed
    //  command, -1 if commands are still pending but none finished before the timeout, or -2 when
    //  no quick commands remain (or an error occurred).
    int pollTimeoutMs = 5000;
    int completedChannel = ssh.QuickCmdCheck(pollTimeoutMs);
    while (completedChannel != -2) {
        if (completedChannel >= 0) {
            String output = ssh.getReceivedText(completedChannel,"utf-8");
            if (ssh.get_LastMethodSuccess() == false) {
                Log.i(TAG, ssh.lastErrorText());
                return;
                }

            Log.i(TAG, "Channel " + String.valueOf(completedChannel) + " finished: " + output);
            }

        if (completedChannel == -1) {
            Log.i(TAG, "Still waiting for a command to finish...");
            }

        completedChannel = ssh.QuickCmdCheck(pollTimeoutMs);
        }

    Log.i(TAG, "All quick commands have been collected.");

    ssh.Disconnect();

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}