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windowfromaccessibleobject (oleacc)
 
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Summary

The WindowFromAccessibleObject function retrieves the window handle that corresponds to a given instance of an IAccessible interface.

C# Signature:

[DllImport("oleacc.dll")]
public static extern uint WindowFromAccessibleObject(IAccessible pacc, ref IntPtr phwnd );

VB .NET Signature:

Declare Function WindowFromAccessibleObject Lib "oleacc.dll" (ByVal pacc as IAccessible, ByRef phwnd as IntPtr) As Integer

User-Defined Types:

None.

Sample Code c#:

   //MouseHook.POINT structure type of POINT
    public class Miscelanious
    {
    static Accessibility.IAccessible iAccessible;//interface: Accessibility namespace
    static object ChildId;
    public static IntPtr GetControlHandlerFromPoint(MouseHook.POINT location)
    {
        IntPtr handler=IntPtr.Zero;

        handler = AccessibleObjectFromPoint(location,out iAccessible,out ChildId);
        WindowFromAccessibleObject(iAccessible, ref handler);
        return handler;

    }
    public static string GetText()
    {
        if (iAccessible != null && ChildId != null)
        {
        return iAccessible.get_accName(ChildId);
        }
        else return "none";

    }


    #region DLLIMPORT

    [DllImport("oleacc.dll")]
    public static extern IntPtr AccessibleObjectFromPoint(MouseHook.POINT pt, [Out, MarshalAs(UnmanagedType.Interface)] out IAccessible accObj, [Out] out object ChildID);

    [DllImport("oleacc.dll")]
    public static extern uint WindowFromAccessibleObject(IAccessible pacc, ref IntPtr phwnd);
    #endregion
    }

Tips & Tricks:

If you are calling this API from .NET Framework version 2.0 or higher, be sure to put the STAThread attribute on your main(), or manually set the ApartmentState property of the thread you are calling this from to ApartmentStates.STA, or you will get an error code of 0x8001010D which is a “cannot call out exception because of an input synchronous call”.

Sample Code:

Please add some!

Alternative Managed API:

The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides a SystemAccessibleObject class to access accessible objects and handle accessible events.

Documentation

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