lptmode.java

本源码给出了在jbuilder下实现串口通信,并且如何使用

/*
 * @(#)LPTMode.java	1.3 98/07/17 SMI
 *
 * Author: Tom Corson
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license
 * to use, modify and redistribute this software in source and binary
 * code form, provided that i) this copyright notice and license appear
 * on all copies of the software; and ii) Licensee does not utilize the
 * software in a manner which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind.
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE
 * SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS
 * BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
 * OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control
 * of aircraft, air traffic, aircraft navigation or aircraft
 * communications; or in the design, construction, operation or
 * maintenance of any nuclear facility. Licensee represents and
 * warrants that it will not use or redistribute the Software for such
 * purposes.
 */

package samples.ParallelBlackBox;

import java.awt.Choice;

import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;

import javax.comm.ParallelPort;
import javax.comm.UnsupportedCommOperationException;

class LPTMode
    extends Choice implements ItemListener {
  private ParallelPortDisplay owner;

  public LPTMode(ParallelPortDisplay owner) {
    super();

    this.add("Unknown");
    this.add("Any");
    this.add("ECP");
    this.add("EPP");
    this.add("NIBBLE");
    this.add("PS2");
    this.add("SPP");
    this.addItemListener(this);

    this.owner = owner;
  }

  protected void showValue() {
    ParallelPort port = this.owner.port;

    if (this.owner.open) {
      /*
       *  Get the port mode
       */

      switch (this.owner.port.getMode()) {
        case ParallelPort.LPT_MODE_ANY:

          this.select("Any");
          break;

        case ParallelPort.LPT_MODE_ECP:

          this.select("ECP");
          break;

        case ParallelPort.LPT_MODE_EPP:

          this.select("EPP");
          break;

        case ParallelPort.LPT_MODE_NIBBLE:

          this.select("NIBBLE");
          break;

        case ParallelPort.LPT_MODE_PS2:

          this.select("PS2");
          break;

        case ParallelPort.LPT_MODE_SPP:

          this.select("SPP");
          break;

        default:

          this.select("Unknown");
          break;
      }

    }

    else {
      this.select("Unknown");
    }
  }

  public void itemStateChanged(ItemEvent ev) {
    ParallelPort port;
    String sel = (String) ev.getItem();
    int value = 0;

    if (sel.equals("Any")) {
      value = ParallelPort.LPT_MODE_ANY;
    }

    else if (sel.equals("ECP")) {
      value = ParallelPort.LPT_MODE_ECP;
    }

    else if (sel.equals("EPP")) {
      value = ParallelPort.LPT_MODE_EPP;
    }

    else if (sel.equals("NIBBLE")) {
      value = ParallelPort.LPT_MODE_NIBBLE;
    }

    else if (sel.equals("PS2")) {
      value = ParallelPort.LPT_MODE_PS2;
    }

    else if (sel.equals("SPP")) {
      value = ParallelPort.LPT_MODE_SPP;
    }

    else {
      this.showValue();
      return;
    }

    port = this.owner.port;

    if (port != null) {
      /*
       *  Set the mode.
       */

      try {
        port.setMode(value);
      }

      catch (UnsupportedCommOperationException e) {
        System.out.println("Cannot set mode to "
                           + sel + " for port "
                           + port.getName());
      }

    }

    this.owner.showValues();
  }
}