It is possible to override the cwnd :: windowproc function to handle the message of an external application, or this function is used as auxiliary for objects CWND ?

Determination of the window procedure WindowProc (WinAPI)

Lresult Callback WindowProc (
HWND HWND,
UINT Message,
WParam WParam,
LPARAM LPARAM)
{
  Switch (Message)
  {
    Case WM_Destroy:
      PostQuitmessage (0);
      Break;
    Default:
      Return DefwindowProc (HWND, Message, Wparam, LParam);
  }
  Return 0;
}

Window procedure definition afxwndproc (MFC)

Lresult Callback AFXWndProc (
HWND HWND,
Uint nmsg,
WParam WParam,
LPARAM LPARAM)
{
  // Special Message Which Identifies The Window As using
  AFXWNDPROC.
    if (nmsg == wm_queryafxwndproc)
      Return 1;
  // All Other Messages Route Through Message Map
  CWND * PWND = CWND :: FROMHANDLEPERMANENT (HWND);
  Assert (PWND! = NULL);
  Assert (PWND- & GT; M_HWND == HWND);
  RETURN AFXCALLWNDPROC (PWND, HWND, NMSG, WPARAM, LPARAM);
}

How to properly organize the redefinition of the MFC window procedure? And if not difficult, explain the principal difference. Thank you

The question is related to CMENU :: INSERTMENU – message processing

Answer 1, Authority 100%

To override the window procedure, you do not have to use MFC tools for this. Simply write your windowproc function and install it with SetWindowlongProc (HWND, GWL_WNDPROC, (Long_PTR) NewWndProc).

WndProc PorigProc = (WndProc) SetWindowLongProc (HWND, GWL_WNDPROC, (Long_PTR) newwndproc);
// New Window Procedure - Global or Static (Static) Class Function
Lresult Callback NewwndProc (Hwnd Hwnd, Uint Umsg, WPARAM WPARAM, LPARAM LPARAM)
{
  Switch (UMSG)
  {
    Case WM_Command:
      If (LOWORD (WPARAM) == ID_EXPCATXML)
      {
        MessageBox (NULL, "Hello", "", MB_OK);
        Return 0;
      }
      Break;
  }
  Return CallWindowProc (Porigproc, HWND, UMSG, WPARAM, LPARAM);
}

afxwndproc is a special case of the usual window procedure

Answer 2

Standard CWND :: WondowProc should work normally, but I can not understand exactly where to make a mistake. Did strictly according to the instructions:

Plugin.h

class plugin: public cwnd
{
...
  Protected:
    Virtual Lresult WindowProc (Uint UMSG, WPARAM WPARAM, LPARAM LPARAM);
};

plugin.cpp

lresult plugin :: windowproc (uint umsg, wparam wparam, lparam lparam)
{
  Switch (UMSG)
  {
  Case WM_Command:
    If (LOWORD (WPARAM) == ID_EXPCATXML)
    {
      AFXMESSAGEBOX (L "TEST");
      Return 0;
    }
    Break;
  }
  Return CWND :: WindowProc (UMSG, WPARAM, LPARAM);
}

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can you need to add auxiliary method to the Plugin class message card?