Learn Java Now/Learn_Java_Now_Microsoft_1996.iso/MsDev/Samples/Microsoft/JavaCallingCOM/usecom.java

Java Source | 1996-08-27 | 7.1 KB | 225 lines

//******************************************************************************
// usecom.java:    Applet
//
//******************************************************************************
import java.applet.*;
import java.awt.*;
import usecomframe;

// import the classes from the type library
import comserver.*;

// Helper class for holding a bunch of values
class BeepValue
{
    String name;
    int value;
}

//==============================================================================
// Main Class for applet usecom
//
//==============================================================================

public class usecom extends Applet
{
    // the interface to the COM object
    ICOMBeeper m_beeper;

    // user interface components
    List m_list;
    Label m_label;
    Button m_button;

    // a list of names and values
    static final int countNames = 6;
    BeepValue m_nameList[];

    // STANDALONE APPLICATION SUPPORT
    //     The main() method acts as the applet's entry point when it is run
    // as a standalone application. It is ignored if the applet is run from
    // within an HTML page.
    //--------------------------------------------------------------------------
    public static void main(String args[])
    {
        // Create Toplevel Window to contain applet usecom
        //----------------------------------------------------------------------
        usecomframe frame = new usecomframe("usecom");

        // Must show Frame before we size it so insets() will return valid values
        //----------------------------------------------------------------------
        frame.show();
        frame.hide();
        frame.resize(frame.insets().left + frame.insets().right  + 320,
                     frame.insets().top  + frame.insets().bottom + 240);

        // The following code starts the applet running within the frame window.
        // It also calls GetParameters() to retrieve parameter values from the
        // command line, and sets m_fStandAlone to true to prevent init() from
        // trying to get them from the HTML page.
        //----------------------------------------------------------------------
        usecom applet_usecom = new usecom();

        frame.add("Center", applet_usecom);
        applet_usecom.init();
        applet_usecom.start();
        frame.show();
    }

    // usecom Class Constructor
    //--------------------------------------------------------------------------
    public usecom()
    {
    }

    // APPLET INFO SUPPORT:
    //        The getAppletInfo() method returns a string describing the applet's
    // author, copyright date, or miscellaneous information.
    //--------------------------------------------------------------------------
    public String getAppletInfo()
    {
        return "Name: usecom\r\n" +
               "Author: Dan Jinguji\r\n" +
               "Created with Microsoft Visual J++ Version 1.0";
    }


    // The init() method is called by the AWT when an applet is first loaded or
    // reloaded.  Override this method to perform whatever initialization your
    // applet needs, such as initializing data structures, loading images or
    // fonts, creating frame windows, setting the layout manager, or adding UI
    // components.
    //--------------------------------------------------------------------------
    public void init()
    {
        resize(240, 200);

        // Create the components for the user interface
        setLayout(null);
        m_label = new Label();
        m_list = new List();
        m_button = new Button();
        add(m_label);
        add(m_list);
        add(m_button);

        // Place the components in the applet
        m_list.reshape(50, 50, 120, 80);
        m_label.reshape(50, 130, 100, 15);
        m_button.reshape(60, 160, 100, 30);

        // Create the COM object
        m_beeper = new CCOMBeeper();

        // Create the list of names and values
        m_nameList = new BeepValue[countNames];
        for(int i = 0; i < countNames; i++)
            m_nameList[i] = new BeepValue();

        // Fill the list of names and values using the COM object
        // Set the current sound using the contants from the type library
        m_beeper.putSound(BeeperConstants.Default);
        // ICOMBeeper.getSoundName returns a string for the current sound
        m_nameList[0].name = m_beeper.getSoundName();
        // Get the associated number back as well
        m_nameList[0].value = m_beeper.getSound();

        // Repeat for the rest of the constants
        m_beeper.putSound(BeeperConstants.Asterisk);
        m_nameList[1].name = m_beeper.getSoundName();
        m_nameList[1].value = m_beeper.getSound();

        m_beeper.putSound(BeeperConstants.Exclamation);
        m_nameList[2].name = m_beeper.getSoundName();
        m_nameList[2].value = m_beeper.getSound();

        m_beeper.putSound(BeeperConstants.Hand);
        m_nameList[3].name = m_beeper.getSoundName();
        m_nameList[3].value = m_beeper.getSound();

        m_beeper.putSound(BeeperConstants.Question);
        m_nameList[4].name = m_beeper.getSoundName();
        m_nameList[4].value = m_beeper.getSound();

        m_beeper.putSound(BeeperConstants.StandardBeep);
        m_nameList[5].name = m_beeper.getSoundName();
        m_nameList[5].value = m_beeper.getSound();

        // Use the list of names to populate the list
        for(int i = 0; i < countNames; i ++)
            m_list.addItem(m_nameList[i].name);
        // Adjust the user interface for the components
        m_label.setAlignment(Label.CENTER);
        m_button.setLabel("Play the Sound");

        // Set the current sound to the first value
        setBeeperSound(0);
        m_list.select(0);
    }

    // Place additional applet clean up code here.  destroy() is called when
    // when you applet is terminating and being unloaded.
    //-------------------------------------------------------------------------
    public void destroy()
    {
    }

    // UseCOM Paint Handler
    //--------------------------------------------------------------------------
    public void paint(Graphics g)
    {
        g.drawString("Created with Microsoft Visual J++ Version 1.0", 10, 20);
    }

    //        The start() method is called when the page containing the applet
    // first appears on the screen. The AppletWizard's initial implementation
    // of this method starts execution of the applet's thread.
    //--------------------------------------------------------------------------
    public void start()
    {
    }

    //        The stop() method is called when the page containing the applet is
    // no longer on the screen. The AppletWizard's initial implementation of
    // this method stops execution of the applet's thread.
    //--------------------------------------------------------------------------
    public void stop()
    {
    }

    // Handle events from the components in the applet
    public boolean handleEvent(Event evt)
    {
        // Event from the button
        if(evt.target == m_button)
        {
            // Play the selected sound
            m_beeper.Play();
            return true;
        }

        // Event from the list
        if(evt.target == m_list)
        {
            // Set the current sound
            List l = (List)m_list;
            setBeeperSound(l.getSelectedIndex());
            return true;
        }

        // Otherwise, pass the event on to super
        return false;
    }

    // Helper function to update based on the list selection
    void setBeeperSound(int index)
    {
        // get the value from the list of names and values
        int i = m_nameList[index].value;
        // echo the value in the label component
        m_label.setText("Sound number: " + i);
        // set the current sound
        m_beeper.putSound(i);
    }
}