Re: [platform-swt-dev] KeyEvent.character

["Steve Northover" <Steve_Northover@xxxxxxxxxx>]

Because Ctrl+A is ^A is ASCII SOH is the hex value 0x01.  It's in the 2.1 JavaDoc.  This comes up a lot.  Maybe we need a FAQ?

"Federico Gentile" <fgentile@xxxxxxxxxxxxxxxxxx> Sent by: platform-swt-dev-admin@xxxxxxxxxxx 04/22/2003 09:48 AM Please respond to platform-swt-dev

To:        <platform-swt-dev@xxxxxxxxxxx>         cc:                 Subject:        [platform-swt-dev] KeyEvent.character

Regarding this snippet

http://dev.eclipse.org/viewcvs/index.cgi/~checkout~/platform-swt-home/sn
ippits/snippet25.html

(See at the bottom of the message for the code itself)

Why do I get this output when I press CTRL+something?

I pressed 
CTRL + A
CTRL + B
CTRL + P
And got
DOWN: stateMask=0x0, keyCode=0x40000, character=0x0 '\0'
DOWN: stateMask=0x40000 CTRL, keyCode=0x0, character=0x1 '
'
UP  : stateMask=0x40000 CTRL, keyCode=0x0, character=0x1 '
'
DOWN: stateMask=0x40000 CTRL, keyCode=0x0, character=0x2 ''
UP  : stateMask=0x40000 CTRL, keyCode=0x0, character=0x2 ''
DOWN: stateMask=0x40000 CTRL, keyCode=0x0, character=0x10 '' UP  :
stateMask=0x40000 CTRL, keyCode=0x0, character=0x10 '' UP  :
stateMask=0x40000 CTRL, keyCode=0x40000, character=0x0 '\0'

If I press 
ALT + A
ALT + B
ALT + P
I can see the character
DOWN: stateMask=0x0, keyCode=0x10000, character=0x0 '\0'
UP  : stateMask=0x10000 ALT, keyCode=0x0, character=0x61 'a'
UP  : stateMask=0x10000 ALT, keyCode=0x0, character=0x62 'b'
UP  : stateMask=0x10000 ALT, keyCode=0x0, character=0x70 'p'
UP  : stateMask=0x10000 ALT, keyCode=0x10000, character=0x0 '\0'

Moreover the javadoc and the code sais e.character is a char but
This: Integer.toHexString (e.character) works? Are char and int
interchangeable?
I have to do this to check if the cey combination is CTRL + A
If((e.character == (int) 'a' - 96) && (e.stateMask == SWT.ALT))
                 // it's CTRL + a

Can anybody explain me why doesn't pressing CTRL + key work the same and
with ALT + key or SHIFT + KEY?

Thanks....

(Im working on winXP, but our target platform in pocketpc with windows.)


----- S N I P P E T -----
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;

public class Main {

public static void main (String [] args) {
                 Display display = new Display ();
                 Shell shell = new Shell (display);
                 Listener listener = new Listener() {
                                  public void handleEvent(Event e) {
                                                   String string = e.type == SWT.KeyDown ? "DOWN" :
"UP  ";
                                                   string += ": stateMask=0x" +
Integer.toHexString(e.stateMask);
                                                   if ((e.stateMask & SWT.CTRL) != 0) string += "
CTRL";
                                                   if ((e.stateMask & SWT.ALT) != 0) string += "
ALT";
                                                   if ((e.stateMask & SWT.SHIFT) != 0) string += "
SHIFT";
                                                   if ((e.stateMask & SWT.COMMAND) != 0) string +=
" COMMAND";
                                                   string += ", keyCode=0x" + Integer.toHexString
(e.keyCode);
                                                   string += ", character=0x" + Integer.toHexString
(e.character);
                                                   switch (e.character) {
                                                                    case 0:                                   string += "
'\\0'"; break;
                                                                    case SWT.BS:                 string += " '\\b'";
break;
                                                                    case SWT.CR:                 string += " '\\r'";
break;
                                                                    case SWT.DEL:                 string += " DEL"; break;
                                                                    case SWT.ESC:                 string += " ESC"; break;
                                                                    case SWT.LF:                 string += " '\\n'";
break;
                                                                    case SWT.TAB:                 string += " '\\t'";
break;
                                                                    default:                                  string += " '" +
e.character +"'"; break;
                                                   }
                                                   System.out.println (string);
                                  }
                 };
                 shell.addListener(SWT.KeyDown, listener);
                 shell.addListener(SWT.KeyUp, listener);
                 shell.setSize (200, 200);
                 shell.open ();
                 while (!shell.isDisposed ()) {
                                  if (!display.readAndDispatch ()) display.sleep ();
                 }
                 display.dispose ();
}

} 
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