error C2440: 'static_cast' : cannot convert from 'BOOL (thiscall CExListCtrl::* )(WPARAM,LPARAM,LRESULT )' to 'void (thiscall CCmdTarget:: )(NMHDR ,LRESULT )'

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Dear bros,
I am converting a vc6 project to vc8 that is visual studio 2005 and I am getting this error. Please suggest a solution to get rid of this.

There is a funtion as following

C++

BOOL CExListCtrl::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
{
        HD_NOTIFY   *pHDN = (HD_NOTIFY*)lParam;

        if((pHDN->hdr.code == HDN_BEGINTRACKW || pHDN->hdr.code == HDN_BEGINTRACKA || pHDN->hdr.code == HDN_DIVIDERDBLCLICKA || pHDN->hdr.code == HDN_DIVIDERDBLCLICKW )
                && pHDN->iItem == 5)            // Prevent only first (col# 0) from resizing
        {
                *pResult = TRUE;                // disable tracking
                return TRUE;                    // Processed message
        }
 		 
        return CListCtrl::OnNotify(wParam, lParam, pResult);
}

this is caught by compiler when is passed through

C++

ON_NOTIFY_REFLECT(WM_NOTIFY, OnNotify )macro funtion.

So please suggest me how to get it done.

Thanking You
saffiuddin

Posted 31-Oct-12 2:18am

Member 9561010

Updated 31-Oct-12 2:31am

nv3

v2

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nv3 31-Oct-12 9:44am

You are trying to hook a handler for ON_NOTIFY to an ON_NOTIFY_REFLECT event. The compiler is complaining because your handler function should have the signature:

void FuncName (NMHDR* pHdr, LRESULT* pRes);

To fix the function signature would be easy, but I guess the command routing needs some fixing also. Read the MSDN technical note on Message Reflection to understand the background. Then the fix will probably be a breeze.

Jochen Arndt 31-Oct-12 10:07am

With VS 2005 use the ON_NOTIFY_REFLECT_EX macro for handlers returning a BOOL. This should do the job for specific messages (like the HDN_xxx messages from your handler) but I'm not sure if this can be also used with the WM_NOTIFY message.

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Pablo Aliskevicius · Answer 1 · 2012-10-31T03:16:00

It looks like the macro ON_NOTIFY_REFLECT in VC6 is different from the one in VC2005. This may be the result of one environment using the ATL version, and the other the MFC version.
Use the button F12 (with the text cursor blinking in the word ON_NOTIFY_REFLECT) on both environments, it will bring you to the macro definition.

Hope this helps,
Pablo.

Member 11578992 · Answer 2 · 2015-04-09T00:44:00

Solution 2

Make sure that return type for 'OnNotify'is always LRESULT entire your solution.

Posted 9-Apr-15 0:44am

Member 11578992

Comments

Richard MacCutchan 9-Apr-15 9:29am

This question is more than 2 years old; you are far too late to post this.

error C2440: 'static_cast' : cannot convert from 'BOOL (__thiscall CExListCtrl::* )(WPARAM,LPARAM,LRESULT *)' to 'void (__thiscall CCmdTarget::* )(NMHDR *,LRESULT *)'