!7

lib 1400155 lib 1400156 // jna 5.1

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinUser;
import com.sun.jna.platform.win32.WinUser.WNDENUMPROC;
import com.sun.jna.win32.StdCallLibrary;

public interface User32 extends StdCallLibrary {
  User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);
  boolean EnumWindows(WinUser.WNDENUMPROC lpEnumFunc, Pointer arg);
  int GetWindowTextA(HWND hWnd, byte[] lpString, int nMaxCount);
}

p {
  final User32 user32 = User32.INSTANCE;
  user32.EnumWindows(new WNDENUMPROC() {
     int count = 0;
     @Override
     public boolean callback(HWND hWnd, Pointer arg1) {
        byte[] windowText = new byte[512];
        user32.GetWindowTextA(hWnd, windowText, 512);
        String wText = Native.toString(windowText);

        // get rid of this if block if you want all windows regardless of whether
        // or not they have text
        if (wText.isEmpty()) {
           return true;
        }

        System.out.println("Found window with text " + hWnd + ", total " + ++count
              + " Text: " + wText);
        return true;
     }
  }, null);
}