Codejock Developer Community : CNoFlickerWnd error

CNoFlickerWnd error : ok, thanks !

Thu, 27 Sep 2007 14:15:13 +0000

Author: evoX
Subject: 8199
Posted: 27 September 2007 at 2:15pm

ok, thanks !

CNoFlickerWnd error : Hi, This template was not...

Thu, 27 Sep 2007 14:04:37 +0000

Author: kstowell
Subject: 8199
Posted: 27 September 2007 at 2:04pm

Hi,

This template was not intended to be used as a base class, a correct implementation would be:

public:
    CNoFlickerWnd  m_wndSomeVar;

If you want to use this as a base class you could probably do it with some minor modifications by adding a constructor, however for what it is worth, it might be just as easy to add "virtual LRESULT WindowProc(UINT message,WPARAM wParam,LPARAM lParam)" to your form view derived class and cut-n-paste the code from the template class, for example:

MyView.h:

protected:
    virtual LRESULT CMyView::WindowProc(UINT message,WPARAM wParam,LPARAM lParam);

MyView.cpp:

LRESULT CMyView::WindowProc(UINT message,WPARAM wParam,LPARAM lParam)
{
    switch (message)
    {
        case WM_PAINT:
        {
            CPaintDC dc(this);

            // Get the client rect, and paint to a memory device context.
            // This will help reduce screen flicker. Pass the memory
            // device context to the default window procedure to do
            // default painting.
            CXTPClientRect rc(this);
            CXTPBufferDC memDC(dc, rc);
            memDC.FillSolidRect(rc, GetXtremeColor(COLOR_WINDOW));

            return CFormView::DefWindowProc(WM_PAINT,(WPARAM)
                memDC.m_hDC, 0);
        }
        case WM_ERASEBKGND:
            return TRUE;
    }
    return CFormView::WindowProc(message, wParam, lParam);
}

Cheers,

CNoFlickerWnd error : I have this CNoFlickerWnd class...

Thu, 27 Sep 2007 13:09:29 +0000

Author: evoX
Subject: 8199
Posted: 27 September 2007 at 1:09pm

I have this CNoFlickerWnd class

emplate<class BASE_CLASS>

class CNoFlickerWnd : public BASE_CLASS

{

protected:

virtual LRESULT WindowProc(UINT message,WPARAM wParam,LPARAM lParam)

{

switch (message)

{

case WM_PAINT:

{

CPaintDC dc(this);

// Get the client rect, and paint to a memory device context.

// This will help reduce screen flicker. Pass the memory

// device context to the default window procedure to do

// default painting.

CXTPClientRect rc(this);

CXTPBufferDC memDC(dc, rc);

memDC.FillSolidRect(rc, GetXtremeColor(COLOR_WINDOW));

return BASE_CLASS::DefWindowProc(WM_PAINT,

(WPARAM)memDC.m_hDC, 0);

}

case WM_ERASEBKGND:

return TRUE;

}

return BASE_CLASS::WindowProc(message, wParam, lParam);

}

};

and I have my class defined like this:

class CMyView : public CNoFlickerWnd

Why I get this error?

Error 202 error C2512: 'CNoFlickerWnd' : no appropriate default constructor available d:\vs\projects\test\testview.cpp 118
Error 203 error C2614: 'CMyView' : illegal member initialization: 'CFormView' is not a base or member d:\vs\projects\test\testview.cpp 118