如何用qt编写多线程的dll？

[qq_31606671]

最近我在学习socket编程，想写一个dll，调用就能完成与服务器通信，但是不知道为何，用来完成这个任务的线程在dll一运行就异常退出，下面是我的代码：
aclient.h

#ifndef ACLIENT_H
#define ACLIENT_H

#include <QObject>
#include <QHostAddress>
#include <QTcpSocket>

class AClient : public QObject
{
    Q_OBJECT
    public:
        explicit AClient(QObject *parent = 0);
        //线程启动时的初始化
        bool start();
        //设置服务器ip
        void setIP_Address(QString ip);
        //设置服务器端口
        void setPort(quint16 port);
        //断线重连
        bool ReConnectOnLoss(QHostAddress address);
        //发送string
        qint64 writeString(QString str);
        //发送字节流
        qint64 writeByteArray(QByteArray block);
    private:
        //服务器ip
        QString IP_ADDRESS;
        //服务器端口
        quint16 PORT;
        //套接字
        QTcpSocket *socket;

};

#endif // ACLIENT_H

athreah.h

#ifndef ATHREAD_H
#define ATHREAD_H

#include <QThread>
#include "aclient.h"

class AThread : public QThread
{
    Q_OBJECT
   public:
       AThread(QString ip,quint16 port);
       ~AThread();
       //发送字符串
       qint64 writeStr(QString str);
       //发送字节流
       qint64 writeByteArray(QByteArray block);
   protected:
       void run();
   private:
       //负责通信的接受和发送

       AClient *myclient;
       //服务端ip
       QString IP_Address;
       //服务端端口
       quint16 Port;

};

#endif // ATHREAD_H

dllaurorasocket.h

#ifndef DLLAURORASOCKET_H
#define DLLAURORASOCKET_H

#include "mythread.h"
extern "C"
{
Q_DECL_EXPORT IAuroraSocket * createSocketThread();
Q_DECL_EXPORT void RealeaseThread(IAuroraSocket *asocket);
}

#endif // DLLAURORASOCKET_H

接口
iaurorasocket.h

#ifndef IAURORASOCKET_H
#define IAURORASOCKET_H

#include "iaurorasocket_global.h"

class IAURORASOCKETSHARED_EXPORT IAuroraSocket
{

public:
    IAuroraSocket();
    virtual ~IAuroraSocket();

    virtual void dosomething() = 0;
};

#endif // IAURORASOCKET_H

接口实现
mythread.h

#ifndef MYTHREAD_H
#define MYTHREAD_H
#include "iaurorasocket.h"
#include <QDebug>
#include <QObject>
#include <athread.h>
class MyThread:public IAuroraSocket,public QObject
{

public:
    MyThread();
    virtual ~MyThread();
    virtual void dosomething();
//private:
    AThread *athread;
    int i;
};

#endif // MYTHREAD_H

mythread.cpp

#include "mythread.h"

MyThread::MyThread()
{
    //this->athread = new AThread("192.168.1.17",2048);
    //this->athread->start();
    i=0;
}
MyThread::~MyThread()
{
}
void MyThread::dosomething(){
    //i++;
    //qDebug()<<"1234";
   this->athread = new AThread("192.168.1.17",2048);
    this->athread->start();
}

使用dll

  QLibrary lib("D:\\Codes\\qt\\build-DllAuroraSocket-Desktop_Qt_5_3_MinGW_32bit-Debug\\debug\\DllAuroraSocket.dll");
        if (lib.load())
        {
            qDebug()<<"加载成功";
            // 定义插件中的两个导出函数的原型
            typedef IAuroraSocket* (*CreateSocketFunction)();
            typedef void (*ReleaseSocketFunction)(IAuroraSocket* mysocket);

            // 解析导出函数
            CreateSocketFunction createASocket =
                    (CreateSocketFunction) lib.resolve("createSocketThread");
            ReleaseSocketFunction releaseASocket =
                    (ReleaseSocketFunction) lib.resolve("RealeaseThread");

            if (createASocket && releaseASocket)
            {
                qDebug()<<"导出成功";
                // 创建Animal对象
                IAuroraSocket * ASocket = createASocket();
                //IAuroraSocket * ASocket1 = createASocket();
                if (ASocket)
                {
                    // 使用插件功能
                    ASocket->dosomething();

                    // 插件使用完毕，删除对象
                   // releaseASocket(ASocket);
                }
            }
            else
            {
                qDebug()<<"导出失败";
            }
            // 卸载插件
            lib.unload();
        }
        else
        {
            qDebug()<<"加载失败";
        }

请问我该如何修改，实现在dll内使用socket多线程编程？