/* class NewEnum enumerates all top-level windows, and displays window-text and
    ProcessID that generated window. Uses inner-class for J/Direct callback class/function.
 					M. Gallant  11/19/2001 */

public class NewEnum {

StringBuffer strb = new StringBuffer() ;

class NewEnumProc extends com.ms.dll.Callback {           // inner class callback
    public boolean callback(int hwnd, int lparam) {
      int [] processID = new int[1] ;
      StringBuffer text = new StringBuffer(50);
      GetWindowText(hwnd, text, text.capacity()+1);
      int threadprocessid = GetWindowThreadProcessId(hwnd, processID) ;
   if (text.length() != 0) {
          // strb.append("hwnd = " + Integer.toHexString(hwnd) + "h:  Text = " + text +  "  ProcID: " + processID[0] + "\r\n") ;
          strb.append("Text: " + text +  "  ProcID: " + processID[0] + "\r\n") ;
      } 
      return true;  // return TRUE to continue enumeration.
    }
  
 }  // end inner class


public NewEnumProc gen() {       // get reference to instance of callback class
 return new NewEnumProc() ;
}

public static void main(String args[]) {
  NewEnum newenum = new NewEnum() ;
  NewEnumProc mycallback = newenum.gen() ;
  boolean results = false;
  results = EnumWindows(mycallback, 1) ;
  if( ! results )
    System.out.println("Problem enumerating windows") ;
   else
    System.out.println(newenum.strb) ;
}


   /** @dll.import("USER32") */
   private static native int GetWindowText(int hwnd, StringBuffer text, int cch);

    /** @dll.import("USER32") */
    private static native int GetWindowThreadProcessId(int hwnd, int[] lpdwProcessId) ;

    /** @dll.import("USER32") */
    private static native boolean EnumWindows(NewEnumProc myproc, int param);

}