Method cast for WTL classes

Introduction

There is often a need to obtain the base class function from a parameter of the type HWND. How can this be done, if it is not possible to use the static_cast method ?

This problem can be solved sufficiently simply for MFC. For example, for CScrollView, you should obtain the function method GetScrollPosition(). This is solved simply for MFC:

<o:p> 

CMyClass::MyFunction(HWND hWnd)<o:p>

{<o:p>

            CScrollView * p = (CScrollView *) CScrollView::FromHandle(hWnd);<o:p>

            CPoint ptScroll = pScroll->GetScrollPosition();<o:p>

}

<o:p> 

How can the analogous problem be solved in WTL?.

Let us assume we need to obtain the function 

void GetScrollOffset( POINT& ptOffset)

public class CScrollWindowImpl from a parameter of the type hWnd. We create the prototype of the class of the parameter.

<o:p> 

class CScrollView : public CScrollWindowImpl<CScrollView><o:p>

{<o:p>

public:<o:p>

            CScrollView(HWND hWnd){ m_hWnd = hWnd; }<o:p>

};<o:p>

<o:p> 

And then in MyFunction method we make

<o:p> 

CMyClass::MyFunction(HWND hWnd)<o:p>

{<o:p>

            ……<o:p>

            CScrollView tScroll(hWnd);<o:p>

            POINT pt;<o:p>

            tScroll.GetScrollOffset(pt);<o:p>

            WTL::CPoint ptScroll(pt);<o:p>

}<o:p>

<o:p>