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Posted 11 Feb 2006

Method cast for WTL classes

, 11 Feb 2006
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Method cast for WTL classes


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:

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p> 

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


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

            CPoint ptScroll = pScroll->GetScrollPosition();<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.


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



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



And then in MyFunction method we make


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



            CScrollView tScroll(hWnd);<o:p>

            POINT pt;<o:p>


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







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Comments and Discussions

GeneralAttach Pin
Jörgen Sigvardsson12-Feb-06 3:38
memberJörgen Sigvardsson12-Feb-06 3:38 
GeneralRe: Attach Pin
michaelvy12-Feb-06 4:04
membermichaelvy12-Feb-06 4:04 

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