[DllImport( "oleacc.dll" )]
    public static extern int AccessibleObjectFromWindow(
            IntPtr hwnd,int dwObjectID,ref Guid refID,ref Accessibility.IAccessible ppvObject );
    [DllImport( "oleacc.dll" )]
    public static extern uint AccessibleChildren(
        Accessibility.IAccessible paccContainer,int iChildStart,int cChildren,[Out] object[] rgvarChildren,out int pcObtained );

而且我很难搞清楚我是否应该/需要在任何返回的对象上调用Marshal.ReleaseComObject.我很感激有人可以开导我这个话题！这是一个示例用法：

Accessibility.IAccessible test(
        int hWnd,string accessName )
    {
        Guid guidCOM = new Guid( 0x618736E0,0x3C3D,0x11CF,0x81,0xC,0x0,0xAA,0x38,0x9B,0x71 );
        Accessibility.IAccessible a = null;

        AccessibleObjectFromWindow(
            new IntPtr( hWnd ),-4,ref guidCOM,ref a );
        object[] children = new object[a.accChildCount];
        int z;
        AccessibleChildren( a,children.Length,children,out z );
        foreach ( Accessibility.IAccessible a2 in children )
            try
            {
                if ( a2.get_accName( 0 ) == accessName )
                    return a2;
            }
            catch
            {
            }
        return null;
    }