Re: Need help solving a threading issue
Hi Scott & David,
Let me correct something - I believe i was wrong in calling my thread a
'worker' thread I was just trying to indicate it to be an alternative thread
to my main thread, which i have manually created. I create the thread as
follows:
UINT ThreadedNW (LPVOID pParam);
void CSvrProcessManager::_InitNetworkServer()
{
/* some code here */
// create the thread
CWinThread* m_Thread = AfxBeginThread(ThreadedNW, this);
}
// FUNCTION CALLED BY WORKER THREAD
UINT ThreadedNW (LPVOID pParam)
{
CSvrProcessManager* pParent = (CHCSvrProcessManager*)pParam;
CSvrNetworkManager networkServer(NULL, pParent);
networkServer.DoModal();
AfxEndThread(0,TRUE);
return 0;
}
With the above code, my networkServer class is created, which i've made it
derive from CDialog. With my scenario, networkServer has to support windows
messaging. The main thread receives events from an active-x control, and it
has a large number of custom messages to post to networkServer, which then
uses sockets to relay these messages to client applications I've written.
Also, the client apps connect to networkServer, so socket-events are received
by networkServer.
So no that i've clarified that, any idea of how to allow ny networkServer
class to support windows messaging, whilst also running in a separate thread
to the main thread, and solving the issues I've pointed out in the 1st
posting? Thanks heaps.
"Scott McPhillips [MVP]" wrote:
shadowulf wrote:
Hi folks,
I have an MFC application that has some GUI functionality. It's main
thead creates a worker thread (using AfxBeginThread), and this worker
thread needs to create an instance of a class (which we'll call
'network' for now) which does some TCP/IP networking stuff;
functionality achieved by inheriting from another class. Also, The
'network' class and the main thead talk to each other via PostMessage.
Now my problem is that I can't figure out how to instantiate the
network class to get everything to work. Here's my attempts and
resultant failures:
ATTEMPT 1) I tried making the network class derive from CDialog to
support windows messaging. It uses a plain dialog resource and calls
ShowWindow(FALSE) since i'm not aqctually interested in any GUI
functionality in the network class. But if the worker thread creates
the network class and calls DoModal on it, the network class stops the
main thread from receiving any GUI interaction.
When you create a worker thread you cannot use CDialog in it. A worker
thread does not have an MFC message pump, but CDialog relies on having
an MFC message pump in-thread.
In what way do you want to support windows messaging for your network
class? If you want CAsyncSocket/CSocket to work then you MUST create a
UI thread, not worker thread.
--
Scott McPhillips [MVP VC++]