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Summary

The MapWindowPoints API

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internal static extern int MapWindowPoints(IntPtr hWndFrom, IntPtr hWndTo, [In, Out] ref NativeMethods.RECT rect, [MarshalAs(UnmanagedType.U4)] int cPoints);

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internal static extern int MapWindowPoints(IntPtr hWndFrom, IntPtr hWndTo, [In, Out] ref System.Drawing.Point pt, [MarshalAs(UnmanagedType.U4)] int cPoints);

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   internal static extern int MapWindowPoints(IntPtr hWndFrom, IntPtr hWndTo, [In, Out] ref NativeMethods.RECT rect, [MarshalAs(UnmanagedType.U4)] int cPoints);

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   internal static extern int MapWindowPoints(IntPtr hWndFrom, IntPtr hWndTo, [In, Out] ref System.Drawing.Point pt, [MarshalAs(UnmanagedType.U4)] int cPoints);

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     MapWindowPoints(ctrl == null ? IntPtr.Zero : ctrl.Handle, newWin == null ? IntPtr.Zero : newWin.Handle, ref pt, 1);

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     MapWindowPoints(ctrl == null ? IntPtr.Zero : ctrl.Handle, newWin == null ? IntPtr.Zero : newWin.Handle, ref ir, 2);

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       MapWindowPoints(ctrl == null ? IntPtr.Zero : ctrl.Handle, newWin == null ? IntPtr.Zero : newWin.Handle, ref pts[i], 1);

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Documentation

[MapWindowPoints] on MSDN