DefWindow, CallWindow..wut Proc??

[Halsafar]

Alright, I know I asked this before, but I never really got a straightforward understandable answer and seeing I am beginning to run into problems.....

All my controls are subclassed.
There is a static message router which derives the right control class from the window long and calls a private wnd proc.

All I want to know is when to call: CallWindowProc and DefWindowProc.

does it matter?
is there a case where I only call one?
is there a case where I call neither?
do I always call CallWindowProc()?
What does CallWindowProc return usually?
Can I deal with CallWindowProc returning 0 to call DefWindow?


whenever I send messages to my subclassed controls, it never worked out right because I was always returning 1 or 0 depending on if a command was found. Instead I have to return CallWindowProc from the private WndProc to get the data from the sendmessage.

So, if I call CallWindowProc should I still call DefWindowProc?

If I deal with a message, any message...should I
return 0;
return DefWindowProc first or CallWindowProc first...neither...


This is beginning to confuse me, and I am way to far into this project to get confused on this subject now.


This is what the basics look like

//------------------
//Msg Router
//------------------
LRESULT CALLBACK ControlSet::MsgRouter(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static long iRet = 0;


    ControlSet* cset=0;
    cset = reinterpret_cast<ControlSet *>(GetWindowLong(hwnd, GWL_USERDATA));
    
    if (cset)    iRet = cset->WndProc(hwnd, msg, wParam, lParam);
    else        iRet=0;

    cset = 0;


    if (iRet == 0)
        return DefWindowProc(hwnd, msg, wParam, lParam);
    else
        return iRet;
}


//----------------------
//Private Subclassed WndProc
//----------------------
long ListBox::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    //check through user-defined events
    for (iterEvent = m_Events.begin(); iterEvent != m_Events.end(); iterEvent++)
        if ( msg == (*iterEvent).CallWord )        return (*iterEvent).p();
    
    //switch through pre-defined events
    switch (msg)
    {
        case WM_LBUTTONDOWN:
        {
            typedef void (*VoidType)();
            VoidType lpFunc = (VoidType)EventClick;
            if (EventClick != 0) lpFunc();
        }
        break;
    }
    
    return    CallWindowProc(m_OldWndProc, hwnd, msg,wParam, lParam); 

} 

HELP!!!!!!!!