Simplest app with QNetworkAccessManager and First-chance exception

[abc100m]

Different back trace but have the same result,

For test this case, I create a new Visual Studio project, and my test code list below. May be someone can test this code

//test.h
#ifndef TEST_H
#define TEST_H
 
#include <QtWidgets/QMainWindow>
#include <QtNetwork>
#include "ui_test.h"
 
 
class Test : public QMainWindow
{
    Q_OBJECT
 
public:
    Test(QWidget *parent = 0);
    ~Test();
 
    public slots:
        void Button_clicked();
        void destroy_clicked();
        void Request_finished(QNetworkReply *reply);
 
private:
    Ui::TestClass ui;
    QNetworkReply* reply;
    QNetworkAccessManager* manager;
};
 
#endif // TEST_H

//test.h
#ifndef TEST_H
#define TEST_H

#include <QtWidgets/QMainWindow>
#include <QtNetwork>
#include "ui_test.h"


class Test : public QMainWindow
{
    Q_OBJECT

public:
    Test(QWidget *parent = 0);
    ~Test();

    public slots:
        void Button_clicked();
        void destroy_clicked();
        void Request_finished(QNetworkReply *reply);

private:
    Ui::TestClass ui;
    QNetworkReply* reply;
    QNetworkAccessManager* manager;
};

#endif // TEST_H

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//test.cpp
#include "test.h"
#include <QtWidgets>
 
Test::Test(QWidget *parent)
: QMainWindow(parent)
{
    ui.setupUi(this);
    QObject::connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(Button_clicked()));
    QObject::connect(ui.btn_destroy, SIGNAL(clicked()), this, SLOT(destroy_clicked()));
 
    reply = NULL;
    manager = NULL;
}
 
Test::~Test()
{
}
 
void Test::Request_finished(QNetworkReply *reply)
{
    //reply->deleteLater();
}
 
void Test::Button_clicked()
{
    manager = new QNetworkAccessManager(this);
    QObject::connect(manager, SIGNAL(finished(QNetworkReply *)), this, SLOT(Request_finished(QNetworkReply *)));
    QNetworkRequest request(QUrl("http://www.google.com"));
    reply = manager->get(request);
}
 
void Test::destroy_clicked()
{
    qDebug() << "to delete reply...";
    if (reply)
    {
        reply->abort();
        delete reply;//->deleteLater();
        reply = NULL;
    }
 
    qDebug() << "to delete manager...";
    if (manager)
    {
        delete manager;
        manager = NULL;
    }
 
    qDebug() << "reply, manager destroyed...";
}

//test.cpp
#include "test.h"
#include <QtWidgets>

Test::Test(QWidget *parent)
: QMainWindow(parent)
{
    ui.setupUi(this);
    QObject::connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(Button_clicked()));
    QObject::connect(ui.btn_destroy, SIGNAL(clicked()), this, SLOT(destroy_clicked()));

    reply = NULL;
    manager = NULL;
}

Test::~Test()
{
}

void Test::Request_finished(QNetworkReply *reply)
{
    //reply->deleteLater();
}

void Test::Button_clicked()
{
    manager = new QNetworkAccessManager(this);
    QObject::connect(manager, SIGNAL(finished(QNetworkReply *)), this, SLOT(Request_finished(QNetworkReply *)));
    QNetworkRequest request(QUrl("http://www.google.com"));
    reply = manager->get(request);
}

void Test::destroy_clicked()
{
    qDebug() << "to delete reply...";
    if (reply)
    {
        reply->abort();
        delete reply;//->deleteLater();
        reply = NULL;
    }

    qDebug() << "to delete manager...";
    if (manager)
    {
        delete manager;
        manager = NULL;
    }

    qDebug() << "reply, manager destroyed...";
}

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