AfxCallWndProc and custom control development

sawerr

Hi In Programming with Microsoft Visual C++.NET book, author shows a custom control dll. In his code:

LRESULT CALLBACK AFX_EXPORT
RygWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());

CWnd\* pWnd;

pWnd = CWnd::FromHandlePermanent(hWnd);
if (pWnd == NULL) {
    // Assume that client created a CRygWnd window
    pWnd = new CRygWnd();
    pWnd->Attach(hWnd);
}
ASSERT(pWnd->m\_hWnd == hWnd);
ASSERT(pWnd == CWnd::FromHandlePermanent(hWnd));
LRESULT lResult = AfxCallWndProc(pWnd, hWnd, message,
                                 wParam, lParam);
return lResult;

}

I downloaded The Ultimate Toolbox code, there is no call to AfxCallWndProc For example:

BOOL COXTabViewContainer::Create(CWnd* pParentWnd, CRect rect/*=CRect(0,0,0,0)*/,
DWORD dwStyle/*=WS_CHILD|WS_VISIBLE*/,
UINT nID/*=AFX_IDW_PANE_FIRST*/)
{
ASSERT(pParentWnd != NULL);
ASSERT(dwStyle & WS_CHILD);
ASSERT(nID != 0);

// the Windows scroll bar styles bits turn on the smart scrollbars
DWORD dwCreateStyle=dwStyle&~(WS\_HSCROLL|WS\_VSCROLL);
dwCreateStyle&=~WS\_BORDER;

dwCreateStyle|=WS\_CHILD;

// define our own window class 
WNDCLASS wndClass;
wndClass.style=CS\_DBLCLKS; 
wndClass.lpfnWndProc=AfxWndProc; 
wndClass.cbClsExtra=0; 
wndClass.cbWndExtra=0; 
wndClass.hInstance=AfxGetInstanceHandle(); 
wndClass.hIcon=0; 
wndClass.hCursor=::LoadCursor(NULL,IDC\_ARROW); 
wndClass.hbrBackground=(HBRUSH)(COLOR\_BTNFACE+1); 
wndClass.lpszMenuName=NULL; 
wndClass.lpszClassName=\_T("TabViewContainer");

if(!AfxRegisterClass(&wndClass))
	return FALSE;

if (!CreateEx(WS\_EX\_CLIENTEDGE,wndClass.lpszClassName,NULL,
	dwCreateStyle,rect.left,rect.top,rect.Width(),rect.Height(),
	pParentWnd->m\_hWnd,(HMENU)(INT\_PTR)nID,NULL))
{
	return FALSE;       // create invisible
}

// remove WS\_EX\_CLIENTEDGE style from parent window
pParentWnd->ModifyStyleEx(WS\_EX\_CLIENTEDGE, 0, SWP\_DRAWFRAME);

// sign 
::SetWindowLongPtr(GetSafeHwnd(),GWL\_USERDATA,ID\_TABVIEWCONTAINER\_SIGN);

SetScrollStyle(0,TRUE);

CalcLayout();

return TRUE;

}

In MSJ for AfxCallWndProc: You can think of AfxWndProc as a function with a big switch statement that routes WM_XXX messages to your window class's OnXXX handler functions. This is a first-order approximation of how AfxWndProc works: // This is a gross simplificat