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win_qextserialport.h

#ifndef _WIN_QEXTSERIALPORT_H_
#define _WIN_QEXTSERIALPORT_H_

#include "qextserialbase.h"
#include <windows.h>
#include <QThread>


/*if all warning messages are turned off, flag portability warnings to be turned off as well*/
#ifdef _TTY_NOWARN_
#define _TTY_NOWARN_PORT_
#endif

class QReadWriteLock;
class Win_QextSerialThread;


/*!
\author Stefan Sander
\author Michal Policht

A cross-platform serial port class.
This class encapsulates the Windows portion of QextSerialPort.  The user will be notified of
errors and possible portability conflicts at run-time by default - this behavior can be turned
off by defining _TTY_NOWARN_ (to turn off all warnings) or _TTY_NOWARN_PORT_ (to turn off
portability warnings) in the project.  Note that defining _TTY_NOWARN_ also defines
_TTY_NOWARN_PORT_.

\note
On Windows NT/2000/XP this class uses Win32 serial port functions by default.  The user may
select POSIX behavior under NT, 2000, or XP ONLY by defining _TTY_POSIX_ in the project. I can
make no guarantees as to the quality of POSIX support under NT/2000 however.

\todo remove copy constructor and assign operator.
*/
00036 class Win_QextSerialPort: public QextSerialBase
{
    Q_OBJECT
    friend class Win_QextSerialThread;

    private:
        /*!
         * This method is a part of constructor.
         */
        void init();

    protected:
        HANDLE Win_Handle;
        HANDLE threadStartEvent;
        HANDLE threadTerminateEvent;
        OVERLAPPED overlap;
        QList<OVERLAPPED*> overlappedWrites;
        COMMCONFIG Win_CommConfig;
        COMMTIMEOUTS Win_CommTimeouts;
00055         QReadWriteLock * bytesToWriteLock;      ///< @todo maybe move to QextSerialBase.
00056         qint64 _bytesToWrite;       ///< @todo maybe move to QextSerialBase (and implement in POSIX).
00057         Win_QextSerialThread * overlapThread; ///< @todo maybe move to QextSerialBase (and implement in POSIX).

        void monitorCommEvent();
        void terminateCommWait();
        virtual qint64 readData(char *data, qint64 maxSize);
        virtual qint64 writeData(const char *data, qint64 maxSize);

    public:
        Win_QextSerialPort(QextSerialBase::QueryMode mode);
        Win_QextSerialPort(Win_QextSerialPort const& s);
        Win_QextSerialPort(const QString & name, QextSerialBase::QueryMode mode);
        Win_QextSerialPort(const PortSettings& settings, QextSerialBase::QueryMode mode);
        Win_QextSerialPort(const QString & name, const PortSettings& settings, QextSerialBase::QueryMode mode);
        Win_QextSerialPort& operator=(const Win_QextSerialPort& s);
        virtual ~Win_QextSerialPort();
        virtual bool open(OpenMode mode);
        virtual void close();
        virtual void flush();
        virtual qint64 size() const;
        virtual void ungetChar(char c);
        virtual void setFlowControl(FlowType);
        virtual void setParity(ParityType);
        virtual void setDataBits(DataBitsType);
        virtual void setStopBits(StopBitsType);
        virtual void setBaudRate(BaudRateType);
        virtual void setDtr(bool set=true);
        virtual void setRts(bool set=true);
        virtual ulong lineStatus(void);
        virtual qint64 bytesAvailable() const;
        virtual void translateError(ulong);
        virtual void setTimeout(long);

        /*!
         * Return number of bytes waiting in the buffer. Currently this shows number
         * of bytes queued within write() and before the TX_EMPTY event occured. TX_EMPTY
         * event is created whenever last character in the system buffer was sent.
         *
         * \return number of bytes queued within write(), before the first TX_EMPTY
         * event occur.
         *
         * \warning this function may not give you expected results since TX_EMPTY may occur
         * while writing data to the buffer. Eventually some TX_EMPTY events may not be
         * catched.
         *
         * \note this function always returns 0 in polling mode.
         *
         * \see flush().
         */
        virtual qint64 bytesToWrite() const;

        virtual bool waitForReadyRead(int msecs);     ///< @todo implement.
};

/*!
 * This thread monitors communication events.
 */
00113 class Win_QextSerialThread: public QThread
{
    Win_QextSerialPort * qesp;
    bool terminate;

    public:
        /*!
         * Constructor.
         *
         * \param qesp valid serial port object.
         */
        Win_QextSerialThread(Win_QextSerialPort * qesp);

        /*!
         * Stop the thread.
         */
        void stop();

    protected:
        //overriden
        virtual void run();

};

#endif

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