QT+= network
tcpClientSocket_.h

#ifndef TCPCLIENTSOCKET__H
#define TCPCLIENTSOCKET__H

#include <QObject>
#include <QtNetwork>
#include <QTcpSocket>

/*
 *
 *
 *
 *
 * 客户端 socket
*/


class tcpClientSocket_ : public QObject
{
    Q_OBJECT
public:
    explicit tcpClientSocket_(QObject *parent = nullptr);

    /**
* @projectName   testMyClass
* @brief         连接TCP ip portNum
* @author        SMY
* @date          2019-03-22
*/
    bool connectTcp(QString ip,int portNum);
    /**
* @projectName   testMyClass
* @brief         断开连接
* @author        SMY
* @date          2019-03-22
*/
    void disConnect();
    /**
* @projectName   testMyClass
* @brief         写数据
* @author        SMY
* @date          2019-03-22
*/
    void write(QString str);

signals:
    /**
* @projectName   testMyClass
* @brief         TCP断开信号
* @author        SMY
* @date          2019-03-22
*/
    void disConnect_signal();
    /**
* @projectName   testMyClass
* @brief         数据接受信号
* @author        SMY
* @date          2019-03-22
*/
    void receiveData(QString data);


public slots:

private:

    QTcpSocket* m_socket;
    void receivData();

};

#endif // TCPCLIENTSOCKET__H

tcpClientSocket_.cpp

#include "tcpclientsocket_.h"

tcpClientSocket_::tcpClientSocket_(QObject *parent) : QObject(parent)
{

    m_socket = new QTcpSocket(this);

    connect(m_socket,&QTcpSocket::disconnected,this
            ,&tcpClientSocket_::disConnect_signal);
    connect(m_socket,&QTcpSocket::readyRead,this
            ,&tcpClientSocket_::receivData);

}

bool tcpClientSocket_::connectTcp(QString ip, int portNum)
{
    m_socket->abort();

    m_socket->connectToHost(ip,portNum);
    if(m_socket->waitForConnected(30000))
    {
        return true;
    }
    else
        return false;
}

void tcpClientSocket_::disConnect()
{
    m_socket->abort();
    m_socket->disconnect();
}

void tcpClientSocket_::write(QString str)
{
    m_socket->write(str.toUtf8().data());
}

void tcpClientSocket_::receivData()
{
    QString str = m_socket->readAll();
    emit receiveData(str);
}