MFC消息完成消息反射

BOOL CWnd::OnCommand(WPARAM wParam, LPARAM lParam)// return TRUE if command invocation was attempted{UINT nID = LOWORD(wParam);HWND hWndCtrl = (HWND)lParam;int nCode = HIWORD(wParam);// default routing for command messages (through closure table)if (hWndCtrl == NULL){// zero IDs for normal commands are not allowedif (nID == 0)return FALSE;// make sure command has not become disabled before routingCTestCmdUI state;state.m_nID = nID;OnCmdMsg(nID, CN_UPDATE_COMMAND_UI, &state, NULL);if (!state.m_bEnabled){TRACE1("Warning: not executing disabled command %d/n", nID);return TRUE;}// menu or acceleratornCode = CN_COMMAND;}else{// control notificationASSERT(nID == 0 || ::IsWindow(hWndCtrl));if (_afxThreadState->m_hLockoutNotifyWindow == m_hWnd)return TRUE; // locked out - ignore control notification// reflect notification to child window controlif (ReflectLastMsg(hWndCtrl))return TRUE; // eaten by child// zero IDs for normal commands are not allowedif (nID == 0)return FALSE;}#ifdef _DEBUGif (nCode < 0 && nCode != (int)0x8000)TRACE1("Implementation Warning: control notification = $%X./n",nCode);#endifreturn OnCmdMsg(nID, nCode, NULL, NULL);}

在OnCmdMsg之前调用ReflectLastMsg完成消息反射，

ReflectLastMsg->SendChildNotifyLastMsg(PS:此时使用CWnd对象调用的)->OnChildNotify->ReflectChildNotify

ReflectChildNotify中调用

case WM_COMMAND:
  {
   // reflect the message through the message map as OCM_COMMAND
   int nCode = HIWORD(wParam);
   if (CWnd::OnCmdMsg(0, MAKELONG(nCode, WM_REFLECT_BASE+WM_COMMAND), NULL, NULL))
   {
    if (pResult != NULL)
     *pResult = 1;
    return TRUE;
   }
  }

其中nCode是一个标识，0是单击，1是双击，2是setfocus

对于wm_notify消息来说是一样的路线，完毕···