C / C++ / MFC

char byte[1000] = {0x95, 0x78, ...};

// Assuming that CMyButton is a custom button control<DIV>

BEGIN_MESSAGE_MAP(CMyButton, CButton)
   ON_WM_LBUTTONDOWN()
END_MESSAGE_MAP<DIV>

.
.
.<DIV>

void CMyButton::OnLButtonDown(UINT uiPos, CPoint point)
{
   // Let's get the parent
   CWnd* pParent = this->GetParent();<DIV>

   // Because the parent IS a CFormView-derived class, the following pointer cast is valid
   CMyFormView* pForm = DYNAMIC_DOWNCAST(CMyFormView, pParent);<DIV>

   // But let's check it anyway
   VERIFY( pForm != NULL );<DIV>

   // Call a member function in the derived class
   pForm->AnyGivenFunction( param1, param2 );
}

// Assuming that our class is CMyFormView, derived from CFormView<DIV>

class CMyFormView : CFormView
{
   .
   .
   .<DIV>

public:
   void SetMessageID( UINT nID ) { this->nMessageID = nID; }
   UINT GetMessageID()           { return this->nMessageID; }<DIV>

private:
   // Because CFormView is derived from CWnd, the CWnd::WindowProc exists
   virtual LRESULT WindowProc( UINT message, LPARAM lParam, WPARAM wParam );
   UINT nMessageID;
};<DIV>

.
.
.<DIV>

LRESULT CMyFormView::WindowProc( UINT message, LPARAM lParam, WPARAM wParam )
{
   // First, let's see if it is our 'custom' message
   if ( message == this->nMessageID )
   {
      // Yup, so let's do something, perhaps use a member function or something ?
   }<DIV>

   // Our check is complete, so let's call the base class implementation to finish up. It checks through the message-maps and passes the control onwards
   return CFormView::WindowProc( message, lParam, wParam );
}