In Java Swing how do you get a Win32 window handle (hwnd) reference to a window?

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You don’t have write any C/JNI code. From Java:

import sun.awt.windows.WComponentPeer;

public static long getHWnd(Frame f) {
   return f.getPeer() != null ? ((WComponentPeer) f.getPeer()).getHWnd() : 0;
}

Caveats:

  • This uses a sun.* package. Obviously this is not public API. But it is unlikely to change (and I think less likely to break than the solutions above).
  • This will compile and run on Windows only. You would need to turn this into reflection code for this to be portable.

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