Re: serial port Writefile: sometimes 998 ERROR_NOACCESS

From:

mfc <mfcprog@googlemail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 24 Dec 2010 11:35:47 -0800 (PST)

Message-ID:

<2bc51885-17dc-4c1c-8ade-aec4e6950caa@p8g2000vbs.googlegroups.com>

Here`s my actual initialization of all these serial writer threads:
I`ve added one CWinThread* array which contains all thread objects for
the CASocThread (which will send information to these serial ports) as
well as a shutdown_event array to shutdown these threads under un-
normal conditions.

BOOL CASocThread::InitSerialThreads()
{

    for(int i=0; i<16; i++) //the number 16 will be removed /
replaced by a #define
    {

        m_wSerialThreads[i] =
(CSerialWriterThread*)AfxBeginThread(RUNTIME_CLASS(CSerialWriterThread),

THREAD_PRIORITY_NORMAL,
                         0,
             CREATE_SUSPENDED);

        if (m_wSerialThreads[i] == NULL)
        { // failed to start
            TRACE("m_writerThread failed\n");
            return FALSE;
        }

        CString port;

        if(i < 10)
            port.Format(_T("\\\\.\\COM%d"), i);
        else
            port.Format(_T("\\.\\COM%d"), i);

        HANDLE hCom = ::CreateFile(port, // filename
                        GENERIC_READ | GENERIC_WRITE, // desired access
                        0, // exclusive
                        NULL, // security irrelevant
                        OPEN_EXISTING, // it has to be there
                        0, //FILE_FLAG_OVERLAPPED, // open asynchronous
                        NULL); // template file

        if (hCom == INVALID_HANDLE_VALUE)
        {
            DWORD err = ::GetLastError();
            return FALSE;
        }

        //shutdown event: does every serial writer thread needs its own
shutdownevent?
        m_ShutdownEvents[i] = ::CreateEvent(NULL, // security
                 TRUE, // manual-reset
                FALSE, // not signaled
                NULL); // anonymous

        m_wSerialThreads[i]->parms = new CSerialParameters(hCom,
AfxGetMainWnd(), m_ShutdownEvents[i]);

        m_wSerialThreads[i]->ResumeThread();

    }
                return TRUE;
}

If added this function here:

CASocThread init:

m_asocThread=
(CASocThread*)AfxBeginThread(RUNTIME_CLASS(CASocThread),
                                                THREAD_PRIORITY_NORMAL,
    0,
    CREATE_SUSPENDED);

if (m_asocThread== NULL)
{ // failed to start
    return NET_Err_AfxBeginThread;
}

//start serial port threads ((INIT OF THE SERIAL PORT THREADS)
m_asocThread->InitDmxThreads();

//add specific params
ASocThParams *params = new ASocThParams (AfxGetMainWnd(),
                                            (CWnd *) m_pNodeListWnd,
                   (CXmlFile *) m_prop);

m_asocThread->SetParameters((LPVOID) params);

// Now start the thread.
m_asocThread->ResumeThread();

Is this initialization of both threads are ok?

best regards
Hans