exited with code -1073741819

[Con Nít]

i made a new class inheriting QTcpsocket,with the following content :

mytcpsocket.h

#ifndef MYTCPSOCKET_H
#define MYTCPSOCKET_H
 
#include <QTcpSocket>
#include <QString>
#include <qvariant.h>
 
class MyTcpSocket : public QTcpSocket
{
public:
    MyTcpSocket(QObject* parent = 0);
    void setClientUser(const QString &strClientUser);
    void setGroup(const int &iGroup);
    QString getClientUser();
    int getGroup();
private:
    QString strClientUser;
    int iGroup;
};
 
#endif // MYTCPSOCKET_H

#ifndef MYTCPSOCKET_H
#define MYTCPSOCKET_H

#include <QTcpSocket>
#include <QString>
#include <qvariant.h>

class MyTcpSocket : public QTcpSocket
{
public:
    MyTcpSocket(QObject* parent = 0);
    void setClientUser(const QString &strClientUser);
    void setGroup(const int &iGroup);
    QString getClientUser();
    int getGroup();
private:
    QString strClientUser;
    int iGroup;
};

#endif // MYTCPSOCKET_H

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mytcpsocket.cpp

#include "mytcpsocket.h"
 
MyTcpSocket::MyTcpSocket(QObject* parent) : QTcpSocket(parent)
{
    //strClientUser = tr("Student");
    iGroup = 0;
}
void MyTcpSocket::setClientUser(const QString &strClientUser){
    this->strClientUser = strClientUser;
}
void MyTcpSocket::setGroup(const int &iGroup){
    this->iGroup = iGroup;
}
QString MyTcpSocket::getClientUser(){
    return strClientUser;
}
int MyTcpSocket::getGroup(){
    return iGroup;
}

#include "mytcpsocket.h"

MyTcpSocket::MyTcpSocket(QObject* parent) : QTcpSocket(parent)
{
    //strClientUser = tr("Student");
    iGroup = 0;
}
void MyTcpSocket::setClientUser(const QString &strClientUser){
    this->strClientUser = strClientUser;
}
void MyTcpSocket::setGroup(const int &iGroup){
    this->iGroup = iGroup;
}
QString MyTcpSocket::getClientUser(){
    return strClientUser;
}
int MyTcpSocket::getGroup(){
    return iGroup;
}

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whenever i used the method of setClientUser or getClientUser
the program got exited with code -1073741819

but the methods of setGroup and getGroup run properly.

help me get to know and solve this problem.thank you so much

[Stef]

These methods + implementation are correct so they should work. Perhaps you are not properly creating a new MyTcpSocket object before calling the methods of this object? Such as:

MyTcpSocket* socket = new MyTcpSocket

MyTcpSocket* socket = new MyTcpSocket

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Can you show us the code on which it fails?

[Con Nít]

this is my code :

client side,when connected() occurs :

if(socket == NULL) return;
    if(socket->state() != QAbstractSocket::ConnectedState ) return;
    QString msg = "NICK";
    QVariant data = QVariant(ui->nick->text().toLatin1());
    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_2);
    out << (quint32) 0;
    out << msg;
    out << data;
    out.device()->seek(0);
    out << (quint32)(block.size() - sizeof(quint32));
 
    socket->write(block);
    socket->flush();

if(socket == NULL) return;
    if(socket->state() != QAbstractSocket::ConnectedState ) return;
    QString msg = "NICK";
    QVariant data = QVariant(ui->nick->text().toLatin1());
    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_2);
    out << (quint32) 0;
    out << msg;
    out << data;
    out.device()->seek(0);
    out << (quint32)(block.size() - sizeof(quint32));

    socket->write(block);
    socket->flush();

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site sever when receive a message from cilent :

MyTcpSocket* socket = static_cast<MyTcpSocket*>(sender());
 
        if (socket == NULL) return;
        if ( socket->state() != QAbstractSocket::ConnectedState ) return;
 
        QDataStream in(socket);
        in.setVersion(QDataStream::Qt_4_2);
 
        if (blockSize == 0) {
            if (socket->bytesAvailable() < (int)sizeof(quint32)) return;
            in >> blockSize;
        }
 
        if (socket->bytesAvailable() < blockSize) return;
 
        QString msgString;
        QVariant msgData;
        in >> msgString;
        in >> msgData;
 
        if(msgString != "NICK"){
            onMessage( msgString, msgData );
        }else{
            socket->setGroup(1);
            qDebug() << "value of group is : " << socket->getGroup();
            socket->setClientUser(msgData.toString());
            qDebug() << "ok";
        }
        blockSize = 0;
        if (socket->bytesAvailable() > 0) receiveMessage();

MyTcpSocket* socket = static_cast<MyTcpSocket*>(sender());

        if (socket == NULL) return;
        if ( socket->state() != QAbstractSocket::ConnectedState ) return;

        QDataStream in(socket);
        in.setVersion(QDataStream::Qt_4_2);

        if (blockSize == 0) {
            if (socket->bytesAvailable() < (int)sizeof(quint32)) return;
            in >> blockSize;
        }

        if (socket->bytesAvailable() < blockSize) return;

        QString msgString;
        QVariant msgData;
        in >> msgString;
        in >> msgData;

        if(msgString != "NICK"){
            onMessage( msgString, msgData );
        }else{
            socket->setGroup(1);
            qDebug() << "value of group is : " << socket->getGroup();
            socket->setClientUser(msgData.toString());
            qDebug() << "ok";
        }
        blockSize = 0;
        if (socket->bytesAvailable() > 0) receiveMessage();

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Application sever output :

value of group is : 1
D:\ProGram\QT\SimpleChat-build-desktop\SimpleChatServer\debug\SimpleChatServer.ex e exited with code -1073741819

[Con Nít]

someone help me

[ChrisW67]

What is in msgData at line 25 (last listing)? Can it be converted to a string?

Edit, more:
-1073741819 is 0xC0000003, which in Windows land means Access violation. This would normally be caused by access through an invalid pointer, or using a reference to an object that no longer exists.

[Con Nít]

I try to use qDebug() << "value of data is : " << msgData.toString(); and it prints out the exact name the user input from client side
instead of using socket->setClientUser(msgData.toString()); i try socket-> setclientuser("Cuong"); or socket-> setclientuser(tr("Cuong"));<<< but the same error occurs

[Con Nít]

Somebody help me, I need it

[ChrisW67]

Is "socket" still pointing at a valid object?
Have you determined the exact line that the error is triggered by?