package require java

java::import org.eclipse.swt.internal.win32.OS
java::import org.eclipse.swt.internal.win32.TCHAR
 
set lpText [java::new {TCHAR int java.lang.String boolean} 0 "Hello, Win32 API World!" true]
set lpCaption [java::new {TCHAR int java.lang.String boolean} 0 "Hello, World" true]
java::call OS MessageBox 0 $lpText $lpCaption [java::field OS MB_OK]