accessibleobjectfromwindow pinvoke.net: AccessibleObj

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.Summary

The AccessibleObjectFromWindow function retrieves the address of the specified intece to the object associated with the given window.

[DllImport("oleacc.dll")]

internal static extern int AccessibleObjectFromWindow(

IntPtr hwnd,

uint id,

ref Guid iid,

[In, Out, MarshalAs(UnmanagedType.IUnknown)] ref object ppvObject);

Private Declare Function AccessibleObjectFromWindow Lib "oleacc" (ByVal Hwnd As Int32, _

ByVal dwId As Int32, _

ByRef riid As Guid, _

<MarshalAs(UnmanagedType.IUnknown)> ByRef ppvObject As Object) As Int32

None.

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Private Declare Function AccessibleObjectFromWindow Lib "oleacc" (ByVal Hwnd As Int32, _

ByVal dwId As Int32, _

ByRef riid As Guid, _

<MarshalAs(UnmanagedType.IUnknown)> ByRef ppvObject As Object) As Int32

Declare Function GetForegroundWindow Lib "user32" () As Int32

Private Sub Form2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim varChild As Accessibility.IAccessible

Dim hWnd As Int32 = GetForegroundWindow()

Dim ID As Int32 = 0

Dim IID_IAcce As Guid = New Guid("618736E0-3C3D-11CF-810C-00AA00389B71")

Dim aaVal As Int32 = AccessibleObjectFromWindow(hWnd, ID, IID_IAcce, varChild)

End Sub

internal enum OID : uint

{

WINDOW = 0x00000000,

SYSMENU = 0xFFFFFFFF,

TITLEBAR = 0xFFFFFFFE,

MENU = 0xFFFFFFFD,

CLIENT = 0xFFFFFFFC,

VSCROLL = 0xFFFFFFFB,

HSCROLL = 0xFFFFFFFA,

SIZEGRIP = 0xFFFFFFF9,

CARET = 0xFFFFFFF8,

CURSOR = 0xFFFFFFF7,

ALERT = 0xFFFFFFF6,

SOUND = 0xFFFFFFF5,

}

Guid guid = new Guid("{618736E0-3C3D-11CF-810C-00AA00389B71}");

object obj = null;

int retVal = AccessibleObjectFromWindow(hwnd, (uint)OID.WINDOW, ref guid, ref obj);

accessible = (IAccessible) obj;

The ManagedWindowsApi project () provides a SystemAccessibleObject class to access accessible objects, that can be instantiated from a window.

Documentation

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