CSerial串口类

c文件

/*
**    FILENAME            CSerialPort.cpp
**
**    PURPOSE                This class can read, write and watch one serial port.
**                        It sends messages to its owner when something happends on the port
**                        The class creates a thread for reading and writing so the main
**                        program is not blocked.
**
**    CREATION DATE        15-09-1997
**    LAST MODIFICATION    12-11-1997
**
**    AUTHOR                Remon Spekreijse
**
**
*/

#include "stdafx.h"
#include "SerialPort.h"


#include "mtype.h"
#include "mqueue.h"

#include <assert.h>


uint8 rcv_buf[1000];
//uint8 snd_buf[1000];


//
// Constructor
//
CSerialPort::CSerialPort()
{
    m_hComm = NULL;

    // initialize overlapped structure members to zero
    m_ov.Offset = 0;
    m_ov.OffsetHigh = 0;

    // create events
    m_ov.hEvent = NULL;
    m_hWriteEvent = NULL;
    m_hShutdownEvent = NULL;

    m_szWriteBuffer = NULL;

    m_bThreadAlive = FALSE;
    m_bSerialPortIsOpen=FALSE;
}

//
// Delete dynamic memory
//
CSerialPort::~CSerialPort()
{
    do
    {
        SetEvent(m_hShutdownEvent);
    } while (m_bThreadAlive);

    TRACE("Thread ended\n");

    delete [] m_szWriteBuffer;
}

uint8 ReadFull(void)
{

    return 0;
}

uint8 ReadEmpty(void)
{

    return 0;
}
//
// Initialize the port. This can be port 1 to 4.
//
BOOL CSerialPort::InitPort(CWnd* pPortOwner,    // the owner (CWnd) of the port (receives message)
                           UINT  portnr,        // portnumber (1..4)
                           UINT  baud,            // baudrate
                           char  parity,        // parity
                           UINT  databits,        // databits
                           UINT  stopbits,        // stopbits
                           DWORD dwCommEvents,    // EV_RXCHAR, EV_CTS etc
                           UINT  writebuffersize)    // size to the writebuffer
{
    assert(portnr > 0 && portnr < 255);
    assert(pPortOwner != NULL);

    // if the thread is alive: Kill
    if (m_bThreadAlive)
    {
        do
        {
            SetEvent(m_hShutdownEvent);
        } while (m_bThreadAlive);
        TRACE("Thread ended\n");
    }

    //InitQueue(void)


    QueueCreate( (uint8 *)rcv_buf,sizeof(rcv_buf),sizeof(uint8),NULL,NULL);
//    QueueCreate( (uint8 *)snd_buf,sizeof(snd_buf),sizeof(uint8),NULL,NULL);

    // create events
    if (m_ov.hEvent != NULL)
        ResetEvent(m_ov.hEvent);
    m_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

    if (m_hWriteEvent != NULL)
        ResetEvent(m_hWriteEvent);
    m_hWriteEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

    if (m_hShutdownEvent != NULL)
        ResetEvent(m_hShutdownEvent);
    m_hShutdownEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

    // initialize the event objects
    m_hEventArray[0] = m_hShutdownEvent;    // highest priority
    m_hEventArray[1] = m_ov.hEvent;
    m_hEventArray[2] = m_hWriteEvent;

    // initialize critical section
    InitializeCriticalSection(&m_csCommunicationSync);

    // set buffersize for writing and save the owner
    m_pOwner = pPortOwner;

    if (m_szWriteBuffer != NULL)
        delete [] m_szWriteBuffer;
    m_szWriteBuffer = new char[writebuffersize];

    m_nPortNr = portnr;

    m_nWriteBufferSize = writebuffersize;
    m_dwCommEvents = dwCommEvents;

    BOOL bResult = FALSE;
    char *szPort = new char[50];
    char *szBaud = new char[50];

    // now it
    EnterCriticalSection(&m_csCommunicationSync);

    // if the port is already opened: close it
    if (m_hComm != NULL)
    {
        CloseHandle(m_hComm);
        m_hComm = NULL;
    }

    // prepare port strings
    sprintf(szPort, "COM%d", portnr);
    sprintf(szBaud, "baud=%d parity=%c data=%d stop=%d", baud, parity, databits, stopbits);

    // get a handle to the port
    m_hComm = CreateFile(szPort,                        // communication port string (COMX)
                         GENERIC_READ | GENERIC_WRITE,    // read/write types
                         0,                                // comm devices must be opened with exclusive access
                     NULL,                            // no security attributes
                         OPEN_EXISTING,                    // comm devices must use OPEN_EXISTING
                         FILE_FLAG_OVERLAPPED,            // Async I/O
                         0);                            // template must be 0 for comm devices

    if (m_hComm == INVALID_HANDLE_VALUE)
    {
        // port not found
        delete [] szPort;
        delete [] szBaud;

        return FALSE;
    }

    // set the timeout values
    m_CommTimeouts.ReadIntervalTimeout = 1000;
    m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000;
    m_CommTimeouts.ReadTotalTimeoutConstant = 1000;
    m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000;
    m_CommTimeouts.WriteTotalTimeoutConstant = 1000;

    // configure
    if (SetCommTimeouts(m_hComm, &m_CommTimeouts))
    {
        if (SetCommMask(m_hComm, dwCommEvents))
        {
            if (GetCommState(m_hComm, &m_dcb))
            {
                m_dcb.fRtsControl = RTS_CONTROL_ENABLE;        // set RTS bit
                if (BuildCommDCB(szBaud, &m_dcb))
                {
                    if (SetCommState(m_hComm, &m_dcb))
                        ; // normal operation... continue
                    else
                        ProcessErrorMessage("SetCommState()");
                }
                else
                    ProcessErrorMessage("BuildCommDCB()");
            }
            else
                ProcessErrorMessage("GetCommState()");
        }
        else
            ProcessErrorMessage("SetCommMask()");
    }
    else
        ProcessErrorMessage("SetCommTimeouts()");

    delete [] szPort;
    delete [] szBaud;

    // flush the port
    PurgeComm(m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);

    // release critical section
    LeaveCriticalSection(&m_csCommunicationSync);

    TRACE("Initialisation for communicationport %d completed.\nUse Startmonitor to communicate.\n", portnr);

    return TRUE;
}

//
// The CommThread Function.
//
UINT CSerialPort::CommThread(LPVOID pParam)
{
    // Cast the void pointer passed to the thread back to
    // a pointer of CSerialPort class
    CSerialPort *port = (CSerialPort*)pParam;

    // Set the status variable in the dialog class to
    // TRUE to indicate the thread is running.
    port->m_bThreadAlive = TRUE;

    // Misc. variables
    DWORD BytesTransfered = 0;
    DWORD Event = 0;
    DWORD CommEvent = 0;
    DWORD dwError = 0;
    COMSTAT comstat;
    BOOL  bResult = TRUE;

    // Clear comm buffers at startup
    if (port->m_hComm)        // check if the port is opened
        PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);

    // begin forever loop. This loop will run as long as the thread is alive.
    for (;;)
    {

        // Make a call to WaitCommEvent(). This call will return immediatly
        // because our port was created as an async port (FILE_FLAG_OVERLAPPED
        // and an m_OverlappedStructerlapped structure specified). This call will cause the
        // m_OverlappedStructerlapped element m_OverlappedStruct.hEvent, which is part of the m_hEventArray to
        // be placed in a non-signeled state if there are no bytes available to be read,
        // or to a signeled state if there are bytes available. If this event handle
        // is set to the non-signeled state, it will be set to signeled when a
        // character arrives at the port.

        // we do this for each

        bResult = WaitCommEvent(port->m_hComm, &Event, &port->m_ov);

        if (!bResult)
        {
            // If WaitCommEvent() returns FALSE, process the last error to determin
            // the reason..
            switch (dwError = GetLastError())
            {
            case ERROR_IO_PENDING:
                {
                    // This is a normal return value if there are no bytes
                    // to read at the port.
                    // Do nothing and continue
                    break;
                }
            case 87:
                {
                    // Under Windows NT, this value is returned for some reason.
                    // I have not investigated why, but it is also a valid reply
                    // Also do nothing and continue.
                    break;
                }
            default:
                {
                    // All other error codes indicate a serious error has
                    // occured. Process this error.
                    port->ProcessErrorMessage("WaitCommEvent()");
                    break;
                }
            }
        }
        else
        {
            // If WaitCommEvent() returns TRUE, check to be sure there are
            // actually bytes in the buffer to read.
            //
            // If you are reading more than one byte at a time from the buffer
            // (which this program does not do) you will have the situation occur
            // where the first byte to arrive will cause the WaitForMultipleObjects()
            // function to stop waiting. The WaitForMultipleObjects() function
            // resets the event handle in m_OverlappedStruct.hEvent to the non-signelead state
            // as it returns.
            //
            // If in the time between the reset of this event and the call to
            // ReadFile() more bytes arrive, the m_OverlappedStruct.hEvent handle will be set again
            // to the signeled state. When the call to ReadFile() occurs, it will
            // read all of the bytes from the buffer, and the program will
            // loop back around to WaitCommEvent().
            //
            // At this point you will be in the situation where m_OverlappedStruct.hEvent is set,
            // but there are no bytes available to read. If you proceed and call
            // ReadFile(), it will return immediatly due to the async port setup, but
            // GetOverlappedResults() will not return until the next character arrives.
            //
            // It is not desirable for the GetOverlappedResults() function to be in
            // this state. The thread shutdown event (event 0) and the WriteFile()
            // event (Event2) will not work if the thread is blocked by GetOverlappedResults().
            //
            // The solution to this is to check the buffer with a call to ClearCommError().
            // This call will reset the event handle, and if there are no bytes to read
            // we can loop back through WaitCommEvent() again, then proceed.
            // If there are really bytes to read, do nothing and proceed.

            bResult = ClearCommError(port->m_hComm, &dwError, &comstat);

            if (comstat.cbInQue == 0)
                continue;
        }    // end if bResult

        // Main wait function. This function will normally block the thread
        // until one of nine events occur that require action.
        Event = WaitForMultipleObjects(3, port->m_hEventArray, FALSE, INFINITE);

        switch (Event)
        {
        case 0:
            {
                // Shutdown event. This is event zero so it will be
                // the higest priority and be serviced first.

                 port->m_bThreadAlive = FALSE;

                // Kill this thread. break is not needed, but makes me feel better.
                AfxEndThread(100);
                break;
            }
        case 1:    // read event
            {
                GetCommMask(port->m_hComm, &CommEvent);
                if (CommEvent & EV_CTS)
                    ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_CTS_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
                if (CommEvent & EV_RXFLAG)
                    ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RXFLAG_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
                if (CommEvent & EV_BREAK)
                    ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_BREAK_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
                if (CommEvent & EV_ERR)
                    ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_ERR_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);
                if (CommEvent & EV_RING)
                    ::SendMessage(port->m_pOwner->m_hWnd, WM_COMM_RING_DETECTED, (WPARAM) 0, (LPARAM) port->m_nPortNr);

                if (CommEvent & EV_RXCHAR)
                    // Receive character event from port.
                    ReceiveChar(port, comstat);

                break;
            }
        case 2: // write event
            {
                // Write character event from port
                WriteChar(port);
                break;
            }

        } // end switch

    } // close forever loop

    return 0;
}

//
// start comm watching
//
BOOL CSerialPort::StartMonitoring()
{
    if (!(m_Thread = AfxBeginThread(CommThread, this)))
        return FALSE;
    TRACE("Thread started\n");
    AfxBeginThread(SerialParseThread,this);
    return TRUE;
}

//
// Restart the comm thread
//
BOOL CSerialPort::RestartMonitoring()
{
    TRACE("Thread resumed\n");
    m_Thread->ResumeThread();
    return TRUE;
}


//
// Suspend the comm thread
//
BOOL CSerialPort::StopMonitoring()
{
    TRACE("Thread suspended\n");
    m_Thread->SuspendThread();
    return TRUE;
}


//
// If there is a error, give the right message
//
void CSerialPort::ProcessErrorMessage(char* ErrorText)
{
    char *Temp = new char[200];

    LPVOID lpMsgBuf;

    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
        NULL,
        GetLastError(),
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
        (LPTSTR) &lpMsgBuf,
        0,
        NULL
    );

    sprintf(Temp, "WARNING:  %s Failed with the following error: \n%s\nPort: %d\n", (char*)ErrorText, lpMsgBuf, m_nPortNr);
    MessageBox(NULL, Temp, "Application Error", MB_ICONSTOP);
    printf("%s\r\n",Temp);

    LocalFree(lpMsgBuf);
    delete[] Temp;
}

//
// Write a character.
//
void CSerialPort::WriteChar(CSerialPort* port)
{
    BOOL bWrite = TRUE;
    BOOL bResult = TRUE;

    DWORD BytesSent = 0;

    ResetEvent(port->m_hWriteEvent);

    // Gain ownership of the critical section
    EnterCriticalSection(&port->m_csCommunicationSync);

    if (bWrite)
    {
        // Initailize variables
        port->m_ov.Offset = 0;
        port->m_ov.OffsetHigh = 0;

        // Clear buffer
        PurgeComm(port->m_hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
        WORD wLen=5;//strlen((char*)port->m_szWriteBuffer);
        bResult = WriteFile(port->m_hComm,                            // Handle to COMM Port
                            port->m_szWriteBuffer,                    // Pointer to message buffer in calling finction
                            wLen,                                    // Length of message to send
                            &BytesSent,                                // Where to store the number of bytes sent
                            &port->m_ov);                            // Overlapped structure

        // deal with any error codes
        if (!bResult)
        {
            DWORD dwError = GetLastError();
            switch (dwError)
            {
                case ERROR_IO_PENDING:
                    {
                        // continue to GetOverlappedResults()
                        BytesSent = 0;
                        bWrite = FALSE;
                        break;
                    }
                default:
                    {
                        // all other error codes
                        port->ProcessErrorMessage("WriteFile()");
                    }
            }
        }
        else
        {
            LeaveCriticalSection(&port->m_csCommunicationSync);
        }
    } // end if(bWrite)

    if (!bWrite)
    {
        bWrite = TRUE;

        bResult = GetOverlappedResult(port->m_hComm,    // Handle to COMM port
                                     &port->m_ov,        // Overlapped structure
                                     &BytesSent,        // Stores number of bytes sent
                                     TRUE);             // Wait flag

        LeaveCriticalSection(&port->m_csCommunicationSync);

        // deal with the error code
        if (!bResult)
        {
            port->ProcessErrorMessage("GetOverlappedResults() in WriteFile()");
        }
    } // end if (!bWrite)

    // Verify that the data size send equals what we tried to send
    if (BytesSent != strlen((char*)port->m_szWriteBuffer))
    {
        TRACE("WARNING: WriteFile() error.. Bytes Sent: %d; Message Length: %d\n", BytesSent, strlen((char*)port->m_szWriteBuffer));
    }
}

//
// Character received. Inform the owner
//
void CSerialPort::ReceiveChar(CSerialPort* port, COMSTAT comstat)
{
    BOOL  bRead = TRUE;
    BOOL  bResult = TRUE;
    DWORD dwError = 0;
    DWORD BytesRead = 0;
    unsigned char RXBuff;

    for (;;)
    {
        // Gain ownership of the comm port critical section.
        // This process guarantees no other part of this program
        // is using the port object.

        EnterCriticalSection(&port->m_csCommunicationSync);

        // ClearCommError() will update the COMSTAT structure and
        // clear any other errors.

        bResult = ClearCommError(port->m_hComm, &dwError, &comstat);

        LeaveCriticalSection(&port->m_csCommunicationSync);

        // start forever loop. I use this type of loop because I
        // do not know at runtime how many loops this will have to
        // run. My solution is to start a forever loop and to
        // break out of it when I have processed all of the
        // data available. Be careful with this approach and
        // be sure your loop will exit.
        // My reasons for this are not as clear in this sample
        // as it is in my production code, but I have found this
        // solutiion to be the most efficient way to do this.

        if (comstat.cbInQue == 0)
        {
            // break out when all bytes have been read
            break;
        }

        EnterCriticalSection(&port->m_csCommunicationSync);

        if (bRead)
        {
            bResult = ReadFile(port->m_hComm,        // Handle to COMM port
                             &RXBuff,                // RX Buffer Pointer
                               1,                    // Read one byte
                             &BytesRead,            // Stores number of bytes read
                             &port->m_ov);        // pointer to the m_ov structure
            // deal with the error code
            if (!bResult)
            {
                switch (dwError = GetLastError())
                {
                    case ERROR_IO_PENDING:
                        {
                            // asynchronous i/o is still in progress
                            // Proceed on to GetOverlappedResults();
                            bRead = FALSE;
                            break;
                        }
                    default:
                        {
                            // Another error has occured. Process this error.
                            port->ProcessErrorMessage("ReadFile()");
                            break;
                        }
                }
            }
            else
            {
                // ReadFile() returned complete. It is not necessary to call GetOverlappedResults()
                bRead = TRUE;
            }
        } // close if (bRead)

        if (!bRead)
        {
            bRead = TRUE;
            bResult = GetOverlappedResult(port->m_hComm,    // Handle to COMM port
                                         &port->m_ov,        // Overlapped structure
                                         &BytesRead,        // Stores number of bytes read
                                         TRUE);             // Wait flag

            // deal with the error code
            if (!bResult)
            {
                port->ProcessErrorMessage("GetOverlappedResults() in ReadFile()");
            }
        } // close if (!bRead)

        LeaveCriticalSection(&port->m_csCommunicationSync);

        // notify parent that a byte was received
        ::SendMessage((port->m_pOwner)->m_hWnd, WM_COMM_RXCHAR, (WPARAM) RXBuff, (LPARAM) port->m_nPortNr);

        QueueWrite(rcv_buf,&RXBuff,1);

        //printf("%02x\r\n",RXBuff);
    } // end forever loop

}

//
// Write a string to the port
//
void CSerialPort::WriteToPort(char* string)
{
    assert(m_hComm != 0);

    memset(m_szWriteBuffer, 0, sizeof(m_szWriteBuffer));
    strcpy(m_szWriteBuffer, string);

    // set event for write
    SetEvent(m_hWriteEvent);
}

void CSerialPort::WriteToPort(char *string, WORD wLen)
{
    assert(m_hComm != 0);

    memset(m_szWriteBuffer, 0, wLen+1);
    memcpy(m_szWriteBuffer,string,wLen);
    // set event for write
    SetEvent(m_hWriteEvent);
}


//
// Return the device control block
//
DCB CSerialPort::GetDCB()
{
    return m_dcb;
}

//
// Return the communication event masks
//
DWORD CSerialPort::GetCommEvents()
{
    return m_dwCommEvents;
}

//
// Return the output buffer size
//
DWORD CSerialPort::GetWriteBufferSize()
{
    return m_nWriteBufferSize;
}






UINT CSerialPort::SerialParseThread(void *param)
{
    BYTE byrecv[100];
    while (1)
    {
        DWORD dwLen;
        dwLen=QueueNData(rcv_buf,1);
        if(dwLen>=5)
        {

            for (int ilp=0;ilp<dwLen;ilp++)
            {
                if ( QueueRead(byrecv + ilp ,rcv_buf,1)!=QUEUE_OK )
                {
                    break;
                }
                printf("%02x\t",byrecv[ilp]);
            }
            printf("\r\n");

            QueueFlush(rcv_buf);

        }
        Sleep(1);
    }

    return TRUE;
}

int CSerialPort::EnumAllComPort(CString *pStr)
{
    int i = 0;
    CHAR Name[25];
    UCHAR szPortName[25];
    LONG Status;
    DWORD dwIndex = 0;
    DWORD dwName;
    DWORD dwSizeofPortName;
    DWORD Type;
    HKEY hKey;
    LPCTSTR data_Set = "HARDWARE\\DEVICEMAP\\SERIALCOMM\\";
    long ret0 = (::RegOpenKeyEx(HKEY_LOCAL_MACHINE, data_Set, 0, KEY_READ, &hKey));

    do
    {
            dwName = sizeof(Name);
            dwSizeofPortName = sizeof(szPortName);
            Status = RegEnumValue(hKey, dwIndex++, Name, &dwName, NULL, &Type,
                    szPortName, &dwSizeofPortName);

            if ((Status == ERROR_SUCCESS) || (Status == ERROR_MORE_DATA))
            {
                    pStr[i] = CString(szPortName); // 串口字符串保存
                    i++;// 串口计数
            }
    }
    while ((Status == ERROR_SUCCESS) || (Status == ERROR_MORE_DATA));

    RegCloseKey(hKey);
    return i;

}

bool CSerialPort::OpenLastPort(CWnd* pPortOwner)
{

    CString strCom[5];
    //InitSlider(1,80,10);
    int exitingSerialNumber=EnumAllComPort(strCom);

    int ilpLatch;
    if ( exitingSerialNumber>0 )
    {

            DWORD dwComPort,dwMaxPortNumber=0;
            char szTmp[10];

            for(int i=0;i<exitingSerialNumber;i++)
            {
                printf("%s\r\n",strCom[i]);
                strcpy(szTmp,strCom[i]);
                dwComPort=(DWORD)atoi(szTmp+3);

                if (dwMaxPortNumber<dwComPort)
                {
                    dwMaxPortNumber=dwComPort;//锁存数值最大的串口号
                    ilpLatch=i;

                }

            }
            if(    InitPort(pPortOwner,dwMaxPortNumber, 115200) )
            {
                    printf("use %s\r\n",strCom[ilpLatch]);
                    StartMonitoring();
                    m_bSerialPortIsOpen=TRUE;
            }
            else
            {
                printf("open %s error\r\n",strCom[ilpLatch]);
            }
    }
    else
    {
        printf("no valid com exit\r\n");
    }

    return TRUE;


}

h文件

/*
**    FILENAME            CSerialPort.h
**
**    PURPOSE                This class can read, write and watch one serial port.
**                        It sends messages to its owner when something happends on the port
**                        The class creates a thread for reading and writing so the main
**                        program is not blocked.
**
**    CREATION DATE        15-09-1997
**    LAST MODIFICATION    12-11-1997
**
**    AUTHOR                Remon Spekreijse
**
**
*/

#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__

#define WM_COMM_BREAK_DETECTED        WM_USER+1    // A break was detected on input.
#define WM_COMM_CTS_DETECTED        WM_USER+2    // The CTS (clear-to-send) signal changed state.
#define WM_COMM_DSR_DETECTED        WM_USER+3    // The DSR (data-set-ready) signal changed state.
#define WM_COMM_ERR_DETECTED        WM_USER+4    // A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.
#define WM_COMM_RING_DETECTED        WM_USER+5    // A ring indicator was detected.
#define WM_COMM_RLSD_DETECTED        WM_USER+6    // The RLSD (receive-line-signal-detect) signal changed state.
#define WM_COMM_RXCHAR                WM_USER+7    // A character was received and placed in the input buffer.
#define WM_COMM_RXFLAG_DETECTED        WM_USER+8    // The event character was received and placed in the input buffer.
#define WM_COMM_TXEMPTY_DETECTED    WM_USER+9    // The last character in the output buffer was sent.

class CSerialPort
{
public:
    bool OpenLastPort(CWnd* pPortOwner);
    int EnumAllComPort(CString *pStr);
    static UINT  SerialParseThread(void *param);
    BOOL m_bSerialPortIsOpen;
    void WriteToPort(char* string,WORD wLen);
    // contruction and destruction
    CSerialPort();
    virtual        ~CSerialPort();

    // port initialisation
    BOOL        InitPort(CWnd* pPortOwner, UINT portnr = 1, UINT baud = 19200, char parity = 'N', UINT databits = 8, UINT stopsbits = 1, DWORD dwCommEvents = EV_RXCHAR | EV_CTS, UINT nBufferSize = 512);

    // start/stop comm watching
    BOOL        StartMonitoring();
    BOOL        RestartMonitoring();
    BOOL        StopMonitoring();

    DWORD        GetWriteBufferSize();
    DWORD        GetCommEvents();
    DCB            GetDCB();

    void        WriteToPort(char* string);

protected:
    // protected memberfunctions
    void        ProcessErrorMessage(char* ErrorText);
    static UINT    CommThread(LPVOID pParam);
    static void    ReceiveChar(CSerialPort* port, COMSTAT comstat);
    static void    WriteChar(CSerialPort* port);

    // thread
    CWinThread*            m_Thread;

    // synchronisation objects
    CRITICAL_SECTION    m_csCommunicationSync;
    BOOL                m_bThreadAlive;

    // handles
    HANDLE                m_hShutdownEvent;
    HANDLE                m_hComm;
    HANDLE                m_hWriteEvent;

    // Event array.
    // One element is used for each event. There are two event handles for each port.
    // A Write event and a receive character event which is located in the overlapped structure (m_ov.hEvent).
    // There is a general shutdown when the port is closed.
    HANDLE                m_hEventArray[3];

    // structures
    OVERLAPPED            m_ov;
    COMMTIMEOUTS        m_CommTimeouts;
    DCB                    m_dcb;

    // owner window
    CWnd*                m_pOwner;

    // misc
    UINT                m_nPortNr;
    char*                m_szWriteBuffer;
    DWORD                m_dwCommEvents;
    DWORD                m_nWriteBufferSize;
};

#endif __SERIALPORT_H__