收到'bad_weak_ptr'错误

我正在尝试将一个共享指针从QTGUI类传递到Client类，并不断收到bad weak ptr错误。我已经读到我不能直接在构造函数中分配shared_from_this()，因为指针在这一点上还没有准备好。

因此，我创建了一个返回对象指针的getptr函数，以便稍后在进一步调用中将其分配给客户端。但是，它似乎也不起作用。

我在这里错过了什么？提前非常感谢你。

qtgui.hpp

#ifndef QTGUI_H
#define QTGUI_H
#include <QMainWindow>
#include <QFileSystemWatcher>
#include <boost/enable_shared_from_this.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/signals2.hpp>
#include <boost/bind.hpp>
class Client;
namespace Ui {
class QTGUI;
}
class QTGUI : public QMainWindow, public boost::enable_shared_from_this<QTGUI>
{
    Q_OBJECT
public:
    explicit QTGUI(QWidget *parent = 0);
    ~QTGUI();
    void start();
    boost::shared_ptr<QTGUI> getptr();
    /* Signals */
    typedef boost::signals2::signal
        <void (const char* ipaddress, const char* port)> start_connect;
    typedef start_connect::slot_type start_connect_st;
    boost::signals2::connection start_connect_ui(const start_connect_st& slot);
private slots:
private:
    Ui::QTGUI *ui;
    boost::shared_ptr<Client> client_;
    start_connect sc_signal;
};
#endif // QTGUI_H

QTGUI.cpp

#include "qtgui.h"
#include "ui_qtgui.h"
#include <iostream>
#include <QHostAddress>
#include <QRegExp>
#include <QIntValidator>
#include <QFileDialog>
#include <unistd.h>
#include <pwd.h>
#include <sys/types.h>
#include "../client/client.hpp"

#include <boost/bind.hpp>
#include <boost/thread.hpp>
QTGUI::QTGUI(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::QTGUI),
    connected_(false),
    client_(new Client)
{

    start();
}
boost::shared_ptr< QTGUI > QTGUI::getptr()
{
    return shared_from_this();
}
void QTGUI::start()
{
    client_->addui(getptr());
    client_->get_con_status(boost::bind(&QTGUI::connection_status, this, 
_1));
}
boost::signals2::connection QTGUI::start_connect_ui(const start_connect_st& 
slot)
{
    return sc_signal.connect(slot);
}

客户端.hpp

#ifndef CLIENT_HPP
#define CLIENT_HPP
#include <boost/asio.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/thread.hpp>
#include <boost/signals2.hpp>
#include "../common/message.hpp"
class QTGUI;
class Client : public boost::enable_shared_from_this<Client>
{
public:
    Client(/*boost::shared_ptr<QTGUI> ui*/);
    void addui(boost::shared_ptr<QTGUI> ptr);

    /* Signals */
    typedef boost::signals2::signal<void (bool status)> connect_status;
    typedef connect_status::slot_type connect_status_st;
    boost::signals2::connection get_con_status(const connect_status_st& slot);
private:
    boost::shared_ptr<QTGUI> ui_;
    boost::shared_ptr<boost::thread> thread_;
    boost::shared_ptr<boost::asio::io_service> io_service_;
    boost::shared_ptr<boost::asio::io_service::work> work_;
    boost::shared_ptr<boost::asio::ip::tcp::socket> socket_;
    connect_status cs_sig;
};
#endif//  client.hpp 

客户端.cpp

#include <boost/bind.hpp>
#include <boost/bind/protect.hpp>
#include <boost/function.hpp>
#include <cstdio> /* sprintf */
#include "client.hpp"
#include "../common/commands.hpp"
#include "../common/kinotify.hpp"
#include "../gui/qtgui.h"
#include <functional> 
#include <unistd.h>
Client::Client(/*boost::shared_ptr<QTGUI> ui*/):
//ui_(ui),
io_service_(new boost::asio::io_service),
work_(new boost::asio::io_service::work(*io_service_)),
connected_(false)
{
    start();
}
void Client::addui(boost::shared_ptr< QTGUI > ptr)
{
    ui_ = ptr;
    std::cout << "Connecting..." << std::endl;
    ui_->start_connect_ui(boost::bind(&Client::post_connect, 
                                      shared_from_this(), _1, _2));
}

void Client::start()
{
    if(thread_)
        return;
    std::cout << "Creating new thread bruh" << std::endl;
    thread_.reset(new boost::thread(
        boost::bind(&boost::asio::io_service::run, io_service_)
    ));
    std::cout << "start Thread ID [" << boost::this_thread::get_id() << 
    "]" << std::endl;
}
void Client::stop()
{
    if(!thread_)
        return;
    std::cout << "Ending" << std::endl;
    socket_->shutdown(boost::asio::ip::tcp::socket::shutdown_both);
    socket_->close();
    io_service_->stop();
    thread_->join();
    io_service_->reset();
    thread_.reset();
}
boost::signals2::connection Client::get_con_status(const connect_status_st& 
slot)
{
    return cs_sig.connect(slot);
}

编辑：添加主.cpp

#include "qtgui.h"
#include <QApplication>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTGUI w;
    w.start();
    w.show();
    return a.exec();
}