C / C++ / MFC

«_Superman_» wrote:

It is always recommended to use SendMessage to the UI thread...

«_Superman_» wrote:

SendMessage is the right way to avoid deadlocks.

CFrameWnd*	pFrameWnd = new CFrameWnd;
m_pMainWnd = pFrameWnd;				// This identifies the application's main wnd

<pre>Wnd * pWindow;

   pWindow = 	AfxGetApp()->m_pMainWnd;
   if (NULL != pWindow) pWindow->PostMessage(WM_DATA_TIMER);

<pre>LRESULT CFrameWnd::OnPanelDataTimer(WPARAM wParam, LPARAM lParam)
{
  if (NULL != m_pClientWnd)  // m_pClientWnd is the main dialog
   {
      if (NULL != m_pClientWnd->m_hWnd)
      {
         // Only send events to registered dialogs with legal windows.  Some dialogs exist w/o
         // having yet been completely instantiated.  Send the events in reverse order, as the array
         // list implies a creation/stacking last in the newest order.

	for(SHORT j = m_pDialogsInUse.GetSize() - 1; j >= 0; j--)
	  if (m_pDialogsInUse[j]->m_hWnd != NULL)
             m_pDialogsInUse[j]->PostMessage(WM_DATA_TIMER);	
      }
   }

return 0;
}

charlieg wrote:

Item 1 - you see how I am invoking PostMessage, from the CWnd object. This
object has an m_hWnd variable, but how would I post a message using this? Based
on what you have said, I'm not thread safe.
 

CreateThread(NULL, 0, MyWorkerThreadFunc, (LPVOID)m_pMainWnd->GetSafeHwnd(), 0, NULL)

DWORD MyWorkerThreadFunc(LPVOID pParam)
{
    HWND MainWnd = (HWND)pParam;
    ...
    ::PostMessage(MainWnd, WM_MYMESSAGE, 0, 0);
    ...
}