WindowFromPoint Function ()

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WindowFromPoint Function

WindowFromPoint Function

The WindowFromPoint function retrieves a handle to the window that contains the specified point.

Syntax

HWND WindowFromPoint(      
    POINT Point
);

Parameters

Point
[in] Specifies a POINT structure that defines the point to be checked.

Return Value

The return value is a handle to the window that contains the point. If no window exists at the given point, the return value is NULL. If the point is over a static text control, the return value is a handle to the window under the static text control.

Remarks

The WindowFromPoint function does not retrieve a handle to a hidden or disabled window, even if the point is within the window. An application should use the ChildWindowFromPoint function for a nonrestrictive search.

Example

For an example, see "Interface from Running Object Table" in About Text Object Model.

Function Information

Minimum DLL Version user32.dll
Header Declared in Winuser.h, include Windows.h
Import library User32.lib
Minimum operating systems Windows 95, Windows NT 3.1
Unicode Implemented as Unicode version.

Minimum DLL Version	user32.dll
Header	Declared in Winuser.h, include Windows.h
Import library	User32.lib
Minimum operating systems	Windows 95, Windows NT 3.1
Unicode	Implemented as Unicode version.

See Also

Windows Overview, ChildWindowFromPoint, POINT, WindowFromDC

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C# declaration and example

deodorant | Edit | Show History

The code below shows an example of how to use WindowFromPoint mixed with GetCursorPos to get the window your mouse is hovered over.

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

[DllImport("user32.dll")]
public static extern bool GetCursorPos(out Point lpPoint);

public static IntPtr GetWindowUnderCursor()
{
   Point ptCursor = new Point();

   if (!(PInvoke.GetCursorPos(out ptCursor)))
      return IntPtr.Zero;

   return WindowFromPoint(ptCursor);
}

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VB.net syntax

dmex | Edit | Show History

<DllImport("user32.dll", EntryPoint:="WindowFromPoint", CharSet:=CharSet.Auto, ExactSpelling:=True)> _
Public Shared Function WindowFromPoint(ByVal pt As POINTSTRUCT) As IntPtr
End Function

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C# syntax

dmex | Edit | Show History

[DllImport("user32.dll", EntryPoint="WindowFromPoint", CharSet=CharSet.Auto, ExactSpelling=true)]
public static extern IntPtr WindowFromPoint(POINTSTRUCT pt);

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