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I wrote the easy test program by C# and .NET 4.0.
[DllImport("user32.dll")]
static extern IntPtr WindowFromPoint(int xPoint, int yPoint);
Point pt = MousePosition;
IntPtr w = WindowFromPoint(pt.X, pt.Y);
If this builts as 32bit, it works. But if it builds as 64bit, an unrelated window handle will return. Are there a solution or alternatives?
Right, that won’t work. WindowFromPoint() does not take two arguments, it only takes one. A structure of type POINT. You got away with it in 32-bit code by sheer accident, that luck ran out in 64-bit mode since it passes arguments a different way.
Use the pinvoke.net web site to find the correct pinvoke declaration.