Name: rm29839 Date: 01/05/98


This examples code work correctly on Windows NT,
but fails on Window95. When working, a Java frame
comes up with a text area inside. I can drag some
text from the Wordpad app onto the textarea and
the dragged text replaces the orginal text when I
drop it. Under Window95 the the step where I
retrieve the dropped text fails.

This is my debug ouput under Window95:

dropped transferable: java.awt.dnd.DropTargetContext$TransferableProxy@c6fdaa0a
class java.io.InputStream
java.io.ByteArrayInputStream@c7d1aa0a
Bytes Avail: 0
Bytes Read: -1

Obviously, I didn't try to drag a null string
onto the frame...
_____________________________________________
import java.awt.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import java.io.*;

public class DndTest extends Frame implements DropTargetListener {

    DropTarget target;
    TextArea text;

    public DndTest ()
{
super("Drop Site");
text = new TextArea("Grab some text and \npull it over here!");
target = new DropTarget(text, DnDConstants.ACTION_COPY, this);
target.setActive (true);
add ("Center", text);
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    }

    public static void main (String args[])
{
DndTest f = new DndTest();
f.setSize (400, 200);
f.setVisible (true);
    }

    ////////////////////////////////////////////////////////// methods in Interface DropTargetListener

    public void dragEnter (DropTargetDragEvent dtde)
{
// System.out.println ("dragEnter");
DataFlavor df[] = dtde.getCurrentDataFlavors();
for (int i = 0; i < df.length; i++)
{
if (df[i].equals (DataFlavor.plainTextFlavor))
{
dtde.acceptDrag (DnDConstants.ACTION_COPY);
return;
}
}
dtde.rejectDrag ();
    }

    public void dragOver (DropTargetDragEvent dtde)
{ /*System.out.println ("dragOver");*/ }

    public void dragScroll (DropTargetDragEvent dtde)
{ /*System.out.println ("dragScroll");*/ }

    public void dragExit (DropTargetEvent dte)
{ System.out.println ("dragExit"); }

    public void drop (DropTargetDropEvent dtde)
{
dtde.acceptDrop (DnDConstants.ACTION_COPY);

Transferable trans = dtde.getTransferable();
DataFlavor df[] = trans.getTransferDataFlavors();
Object obj = null;
System.out.println ("dropped transferable: "+trans);

try
{
for (int i = 0; i < df.length; i++)
{
System.out.println(df[i].getRepresentationClass());
if (df[i].isRepresentationClassInputStream())
obj = trans.getTransferData(df[i]);
}
//if (trans.isDataFlavorSupported(DataFlavor.plainTextFlavor))
// obj = trans.getTransferData(DataFlavor.plainTextFlavor);
System.out.println (obj);
if (obj != null)
{
InputStream input = (InputStream) obj;
System.out.println("Bytes Avail: "+Integer.toString(input.available()));
StringBuffer str = new StringBuffer();
byte[] buffer = new byte[64];
int count = input.read(buffer);
System.out.println("Bytes Read: "+Integer.toString(count));
while (count != -1)
{
str.append (new String (buffer, 0, count));
count = input.read(buffer);
System.out.println("Bytes: "+Integer.toString(count)+". "+buffer);
}
input.close();
text.setText (str.toString());
}
} catch (Exception e)
{ e.printStackTrace(); }
finally
{
try { target.getDropTargetContext().dropComplete(true); }
catch (Exception ignore) {}
}
    }

    //////////////////////////////////////////////////////////////// other methods

    protected void processWindowEvent (WindowEvent e)
{
if (e.getID() == WindowEvent.WINDOW_CLOSING)
System.exit(0);
super.processWindowEvent (e);
    }

}
(Review ID: 22349)
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