JFrame blink with JNA

[Rodrigo Cabrera Pliego]

Hi everyone, here is my question!.
I'm trying to make a java chat from some big company blah blah, i have all the chat working great, the big problem is that when some one gets a new message i want the jframe to blink like msn,
Ok I now what you're going to say, why don't you use toFront() method it does the work for you etc,
I've allready done that, and yes it works, for some Windows distribution, yes i hear about jniwrapper, and i allready use it, and work great, but is a problem for the company to buy the license, and the boss is like no you do it... so i use JNA and i have done this:
Interface User32:

public interface User32 extends StdCallLibrary
{
  User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class,
W32APIOptions.DEFAULT_OPTIONS);

        public int FlashWindowEx(FLASHWINFO.PFLASHWINFO ptrFlashWInfo);

        /*
        typedef struct {
          UINT  cbSize;
          HWND  hwnd;
          DWORD dwFlags;
          UINT  uCount;
          DWORD dwTimeout;
        } FLASHWINFO, *PFLASHWINFO;
        */
        public static class FLASHWINFO extends Structure {
                public int cbSize;
                public HANDLE hWnd;
                public int dwFlags;
                public int uCount;
                public int dwTimeout;

                   public static class PFLASHWINFO extends FLASHWINFO implements
Structure.ByReference { }
}
}

Class Flasher2.java

public class Flasher2 implements  User32
{


   private Component window ;

    public Component getWindow() {
        return window;
    }

    public void setWindow(Component window) {
        this.window = window;
    }

   public void flashTheWindow() throws Exception
   {
        HWND hwnd = new HWND();
        hwnd.setPointer(Native.getComponentPointer(window));

        FLASHWINFO.PFLASHWINFO info = new FLASHWINFO.PFLASHWINFO();
        info.hWnd = hwnd;
        info.dwFlags = 3;                 // FLASHW_ALL = 0x03
        info.uCount = 100;                // flash 100 times
        info.dwTimeout = 250;                // 250 mSec = 4 Hz
        info.cbSize =  (Pointer.SIZE + 4) + 16; // sizeof (HWND) + 4


        System.err.println(info.toString());

        // call the system library
        if (FlashWindowEx(info) == 1) {
                System.err.println("Hey! It worked!");
        } else {
                System.err.println("Rats! It failed!");
        }
   }

   @Override
   public int FlashWindowEx(FLASHWINFO.PFLASHWINFO flashInfo) {
        User32 lib = User32.INSTANCE;
        int result = lib.FlashWindowEx(flashInfo);
        int err = Native.getLastError(); // 87 = invalid parameter
        return result;
   }
}

and the jframe trying to blink!

public class Flasher extends javax.swing.JFrame {

    /** Creates new form Flasher */
    public Flasher() {
        initComponents();
        Flasher2 f2=new Flasher2();
        f2.setWindow(this);
        try {
            f2.flashTheWindow();
        } catch (Exception ex) {
            Logger.getLogger(Flasher.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Flasher().setVisible(true);
            }
        });
    }
 

    // Variables declaration - do not modify
    // End of variables declaration

}

The result i get is:
User32$FLASHWINFO$PFLASHWINFO(allocated@0x8a60d8 (20 bytes))
{ int cbSize@0=1f4
WinNT$HANDLE hWnd@4=native@0xde0232
int dwFlags@8=3
int uCount@c=64
int dwTimeout@10=fa }
Rats! It failed!

PLEAASSEEEEE HELP!!

[Michael Dunn]

if you just want the frame to 'flash' have you thought about using a swing timer
to change the frame.rootPane's border between normal and (say) a wide red.
a new message starts the timer.

just tested it - certainly looks like it's flashing (I don't use msn, so cannot compare)