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  1. 14th February 2013, 15:57 #1
    Drauggul
    Drauggul is offline Beginner
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    Default Re: problem with Tcp socket reception in a thread...

    Hi! I have quite similar problem with Qthread.

    Everything is ok until I unlink the Ethernet cable. And Try reconnect when connection error signel recived.


    from console:
    socket: QObject(0x0)
    socket: QTcpSocket(0xafb02498)
    Connecting to: "192.168.1.5"
    resize event
    "Ppm2_window" OGOLNY
    show event
    MODEL:x: false
    "Ppm2_window" OGOLNY
    console request
    permision to send data: true
    Socket state: QAbstractSocket::HostLookupState
    Socket state: QAbstractSocket::ConnectingState
    Not connected: true
    sock open: false
    Socket state: QAbstractSocket::UnconnectedState
    sock open: false
    Socket error: "Unknown error"
    Socket error: QAbstractSocket::SocketTimeoutError

    Connecting to: "192.168.1.5"
    Socket state: QAbstractSocket::HostLookupState
    Socket state: QAbstractSocket::ConnectingState
    QObject: Cannot create children for a parent that is in a different thread.
    (Parent is QTcpSocket(0xafb02498), parent's thread is TcpClient(0x8473da0), current thread is QThread(0x82f66a8)
    QObject: Cannot create children for a parent that is in a different thread.
    (Parent is QTcpSocket(0xafb02498), parent's thread is TcpClient(0x8473da0), current thread is QThread(0x82f66a8)
    Socket state: QAbstractSocket::UnconnectedState
    sock open: true
    Socket error: "Host unreachable"
    Socket error: QAbstractSocket::NetworkError
    Network error: "Host unreachable"
    Not connected: true
    sock open: false
    Socket state: QAbstractSocket::UnconnectedState
    sock open: false
    My Qestion is. Why it works like that? I have no idea how to solve this problem

    Qt Code: 
    1. #ifndef TCPCLIENT_H
    2. #define TCPCLIENT_H
    3.  
    4. #include <QThread>
    5. #include <QTcpSocket>
    6. #include <QAbstractSocket>
    7. #include <QObject>
    8. #include <QDebug>
    9. #include <QTime>
    10. #include "globalne.h"
    11.  
    12. class TcpClient : public QThread
    13. {
    14.     Q_OBJECT
    15.  
    16.  
    17.  
    18. public:
    19.  
    20.     explicit TcpClient(QObject *parent = 0);
    21.     ~TcpClient();
    22.     void run();
    23.     bool StartConnection();
    24.     void zakoncz_polaczenie_z_e1000();
    25.  
    26. signals:
    27.     void dataReady(QByteArray, QTime);
    28.     void connectionError();
    29.  
    30. public slots:
    31.     void readyRead();
    32.     void disconnected();
    33.     void connected();
    34.     void stateChanged(QAbstractSocket::SocketState);
    35.     void displayError(QAbstractSocket::SocketError);
    36. //    void bytesWritten (qint64 bytes);
    37.  
    38.  
    39. private:
    40.  
    41. //    CanMon canmnon_parent;
    42. //    QTcpSocket socket;
    43.     QTcpSocket *socket;
    44.     QTime       time;
    45. //    QStringList lista;
    46.     bool ponawiaj;
    47.  
    48.  
    49.  
    50. };
    51.  
    52. #endif // TCPCLIENT_H
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    Qt Code: 
    1. //#include "tcpclient.h"
    2.  
    3. //TcpClient::TcpClient(QObject *parent) :
    4. //    QObject(parent)
    5. //{
    6. //}
    7.  
    8. #include <QStringList>
    9. #include "tcpclient.h"
    10.  
    11. #include <QFile>
    12. #include <QTextStream>
    13.  
    14.  
    15. TcpClient::TcpClient(QObject *parent) :
    16.     QThread(parent)
    17. {
    18.  
    19.     socket = NULL;
    20.         qRegisterMetaType<QAbstractSocket::SocketError>("QAbstractSocket::SocketError");
    21.                 qRegisterMetaType<QAbstractSocket::SocketState>("QAbstractSocket::SocketState");
    22.     ponawiaj = true;
    23.  
    24. }
    25.  
    26. TcpClient::~TcpClient()
    27. {
    28. //        qDebug() << "p";
    29.  
    30.  
    31.     disconnect(socket,SIGNAL(connected()), this, SLOT(connected()));
    32.     disconnect(socket,SIGNAL(readyRead()),this,SLOT(readyRead()));
    33.     disconnect(socket,SIGNAL(disconnected()), this, SLOT(disconnected()));
    34. //    disconnect(socket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),this,SLOT(stateChanged(qSockState)));
    35.     socket->close();
    36.     qDebug() << "socket open: " << socket->isOpen();
    37.     delete socket;
    38. }
    39.  
    40. void TcpClient::stateChanged(QAbstractSocket::SocketState st)
    41. {
    42.     qDebug() << "Socket state: " << st;
    43.     switch(st)
    44.     {
    45.         case QAbstractSocket::UnconnectedState:
    46.         qDebug() << "sock open: " << socket->isOpen();
    47.             break;
    48.     }
    49. }
    50.  
    51. void TcpClient::displayError(QAbstractSocket::SocketError se)
    52. {
    53.      qDebug() << "Socket error: " << socket->errorString();
    54.     qDebug() << "Socket error: " << se;
    55.  
    56.     switch(se)
    57.     {
    58.     case QAbstractSocket::SocketTimeoutError:
    59.         StartConnection();
    60.         break;
    61.     case QAbstractSocket::NetworkError:
    62.         qDebug() << "Network error: " << socket->errorString();
    63.         break;
    64.  
    65.     }
    66.  
    67. //       this->StartConnection();
    68. }
    69.  
    70. bool TcpClient::StartConnection()
    71. {
    72. #define z_pliku 0
    73.  
    74. #if z_pliku
    75.     QFile mFile("iphosta.cfg");
    76.     if (!mFile.open(QFile::ReadOnly | QFile::Text))
    77.     {
    78.         qDebug() << mFile.errorString();
    79.         qDebug() << "nie otworzono pliku... próba połączenia z localhost";
    80.         socket->connectToHost("localhost",4010);
    81.     }
    82.     else
    83.     {
    84.         QTextStream in(&mFile);
    85.         QString host = in.readAll();
    86.         mFile.close();
    87.         qDebug() << "Connecting to: " << host;
    88.         socket->connectToHost(host,4010);
    89.     }
    90. #else
    91.     QString host = "192.168.1.5";
    92. //    QString host = "192.168.1.48";
    93.     qDebug() << "Connecting to: " << host;
    94.  
    95.     socket->connectToHost(host,4010);
    96. #endif
    97.  
    98.     if(socket->waitForConnected(5000))
    99.     {
    100.         qDebug() << "Connected: " <<  socket->isOpen();
    101.  
    102.     }
    103.     else
    104.     {
    105.         qDebug() << "Not connected: " <<  socket->isOpen();
    106.         socket->close();
    107.     }
    108.  
    109.     qDebug() << "sock open: " << socket->isOpen();
    110.  
    111.     return socket->isOpen();
    112. }
    113.  
    114. void TcpClient::zakoncz_polaczenie_z_e1000()
    115. {
    116.     int result;
    117.     if (socket->state())
    118.     {
    119.         result = socket->write(QByteArray::fromHex(QString("e1fc00000000000000000000000000000000000000000000000000f7e000e2").toAscii()));
    120.         qDebug() << "nadano koniec polaczenia: " << result;
    121.         this->msleep(500);
    122.         qDebug() << "minely 2 sekundy";
    123.     }
    124.     ponawiaj = false;
    125. }
    126.  
    127. void TcpClient::run()
    128. {
    129.     qDebug() << "socket: " << socket;
    130.     if(!socket)
    131.         socket = new QTcpSocket();
    132.     qDebug() << "socket: " << socket;
    133.  
    134.     connect(socket,SIGNAL(connected()), this, SLOT(connected()));
    135.     connect(socket,SIGNAL(readyRead()),this,SLOT(readyRead()));
    136.     connect(socket,SIGNAL(disconnected()), this, SLOT(disconnected()));
    137.     connect(socket, SIGNAL(error(QAbstractSocket::SocketError)),this, SLOT(displayError(QAbstractSocket::SocketError)));
    138.     connect(socket,SIGNAL( stateChanged(QAbstractSocket::SocketState)),this, SLOT(stateChanged(QAbstractSocket::SocketState)));
    139. //    error(QAbstractSocket::SocketError)
    140. //            SIGNAL(stateChanged(qSockState)),this,SLOT(tcStateChanged(qSockState)));
    141.  
    142.     this->StartConnection();
    143.     this->exec();
    144.  
    145. }
    146.  
    147. void TcpClient::connected()
    148. {
    149.     qDebug() << "connection established: " << socket->isOpen();
    150. }
    151.  
    152. void TcpClient::disconnected()
    153. {
    154.     qDebug() << " Disconnected";
    155. }
    156.  
    157. void TcpClient::readyRead()
    158. {
    159.  
    160.     QByteArray data;
    161.  
    162.         //    qDebug() << "Redy read ";
    163.  
    164.         if (socket->bytesAvailable() > 0)
    165.         {
    166. //            qDebug() << "dostepne bajty: " << socket->bytesAvailable();
    167.  
    168.             data = socket->readAll();
    169. //            qDebug() << "odebrano: " << data.toHex();
    170.             time.start();
    171. //            qDebug() << "TIME: " << time.toString() << "." << time.msec();
    172.             emit dataReady(data, time);
    173.         }
    174. }
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  2. 15th February 2013, 05:17 #2
    anda_skoa
    anda_skoa is offline Administrator
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    Default Re: problem with Tcp socket reception in a thread...

    That looks weird quite wrong. All your slots are being executed in the main thread (cross thread signal/slot connections, receiver object "thsi" belongs to main thread).

    Cheers,
    _
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