C / C++ / MFC

HANDLE hDieNow, hImDead; //Global variables

CMyDialog::OnInitDialog()
{
  //other stuff

  //create the events here
  hDieNow = CreateEvent(NULL, TRUE, FALSE, NULL);
  hImDead = CreateEvent(NULL, TRUE, FALSE, NULL); 

  //Please look into the documentation of CreateEvent to know about the parameters.

  return TRUE;
}

UINT ThreadFunc(LPVOID pFuncParams)
{
  while(true)
  {
   if(WaitForSingleObject(hDieNow, 0) == WAIT_OBJECT_0) 
      break;

   else
   {
     //Your thread code should be here.
     Sleep(100);
     OutputDebugString(_T("Thread probe...\n"));
   }
  }
  SetEvent(hImDead); //Tell the main thread that clean up is complete.
  return false;
}

CMyDialog::OnClose()
{
  SetEvent(hDieNow); //Tell the thread to stop everything and do clean up.
  DWORD dwResult = WaitForSingleObject(hImDead, 5000); //Give the thread 5 seconds to clean up.
  //Check the value of dwResult. It must be WAIT_OBJECT_0, if the wait succeeded!
  
  //Proceed to quit the application. The thread must be dead now.
}

susanne1 wrote:

I am using SDI application, so i will put the code in BOOL OnNewDocument() instead of OnInitDialg().

susanne1 wrote:

Now a general question: why can i not use ON_WM_CLOSE() to tell the small thread to terminate himself and if yes how?

1. Ensure there is a volatile LONG variable (let's call it lTerminate) visible to both your main thread's code and your second thread's code. Initialise that variable to 0 before the second thread is started
2. When you start the second thread, store its handle somewhere it can be seen by the code that will terminate the thread.
3. The second thread's loop should look like this:
   
   

   bool PrintMy Results(const CString& strMyResult)
   {
     while(!lTerminate && nCount < arrMyResults.GetSize()) 
     {
       nCount++;
   // Code to print the Array-Elements
   // I am hier inside the secondary thread wich is in another // class as the Doc class, how can I till him hier that the //application is going to be finsihed and he must finsh the printing //of the last line of the Array?
     }
   }

4. When you want to exit, set lTerminate to 1 with an appropriate function (as I'll show you below) and wait for the thread's handle to be set, as that indicates the thread has exitted:
   
   

   ::InterlockedExchange(&lTerminate, 1);
   ::WaitForSingleObject(hSecondThread, INFINITE);

Ahmed Manzoor wrote:

I thought of one way was that I should append a termination string in the end of the message. But others said that prefixing the message length is far more better?

Ahmed Manzoor wrote:

And, by the way, what is the minimum amount of bytes/bits that will successfully transfer in one shot using TCP/IP?