CODEWITHSUNDEEP
c#.netwinforms64-bit
Tank2005
Tank2005

Reputation: 909

WindowFromPoint doesn't work correctly on 64bit .NET Framework

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?

Upvotes: 2

Views: 3441

Answers (2)

Yasin Ebrahim Nezhadian
Yasin Ebrahim Nezhadian

Reputation: 1

this is worked for me:

[DllImport("user32.dll")]
public static extern IntPtr WindowFromPoint(System.Drawing.Point pt);

and to use:

IntPtr hwnd = WindowFromPoint(new System.Drawing.Point(x, y));

the main document also said that we should never use the System.Window.Point we should use System.Drawing.Point.

http://pinvoke.net/default.aspx/user32.WindowFromPoint

Upvotes: 0

Hans Passant
Hans Passant

Reputation: 941635

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.

Upvotes: 11

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