#27 Provide native handle of JFrame

[M.Püski]

It would be a great improvement if a native Window handle of a JFrame could be provided. This is needed in order to "embed" a JFrame or a Window into a WindowsForms Application.

Eaxample:

In a WindowsForms Application we can easily set the parent with an dll import:

[DllImport("user32.dll")]
private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

Thus we neet a handle from the frame, in pure Java it could be done like this:

import sun.awt.windows.WComponentPeer;

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

Unfortunately, there's no WComponentPeer in ikvm. Please provide at least a WComponentPeer or an utility class to get the native window handle of JFrame.

[Small SQL]

With the follow code you receive the instance of System.Windows.Forms.Form of the JFrame and print the handle.

public delegate void invokeForm(System.Windows.Forms.Form form);

static void Main(string[] args)
{
javax.swing.JFrame frame = new javax.swing.JFrame("My Frame");
frame.pack();
frame.setVisible(true);
java.awt.peer.ComponentPeer peer = frame.getPeer();
Type peerType = peer.GetType();
System.Reflection.MethodInfo getControl = peerType.GetMethod("get_Control", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
System.Windows.Forms.Form form = (System.Windows.Forms.Form)getControl.Invoke(peer, null);
form.Invoke(new invokeForm(WriteLineHandle), form);
}

static void WriteLineHandle(System.Windows.Forms.Form form)
{
Console.WriteLine(form.Handle);
}