Question

来源：https://mega.co.nz/#!xUMiSRYC!Y8Sxz2fEFb6yEIrnKiGx9n2zeK4YTUwUrCByaAkcOPI

我遇到QThread :: currentThread（） - ＆gt; quit（）;

的问题

如果你打开我的myobject.cpp并转到第13行，quit（）调用应该退出。但似乎quit（）调用不起作用，它只是跳过它。看不出问题。：（

main.cpp中：

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    QObject::connect(&a, SIGNAL(aboutToQuit()),
                     &w, SLOT(cleanUp()));

    return a.exec();
}

mainwindow.cpp：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "myobject.h"
#include <QMessageBox>

MyObject* cObject;

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setFixedSize(this->size());

    cThread = new QThread(this);
    cObject = new MyObject();
    cObject->moveToThread(cThread);

    QObject::connect(ui->pushButton_2, SIGNAL(clicked()),
                     this, SLOT(close()));

    QObject::connect(cThread, SIGNAL(started()),
                     cObject, SLOT(doWork()));

    QObject::connect(ui->pushButton, SIGNAL(clicked()),
                     this, SLOT(runThreadSlot()));

    QObject::connect(cThread, SIGNAL(finished()),
                     cThread, SLOT(deleteLater()));

    QObject::connect(cThread, SIGNAL(finished()),
                     cObject, SLOT(deleteLater()));

    QObject::connect(cObject, SIGNAL(setStatusBarSignal(QString)),
                     this, SLOT(setStatusBarSlot(QString)));

    ui->lineEdit->setValidator(new QIntValidator(this));
    ui->lineEdit->setFocus(Qt::OtherFocusReason);
    ui->statusBar->showMessage("Waiting for input...");
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::runThreadSlot()
{
    cThread->start();
    // I've trimmed some code here.
}

void MainWindow::setStatusBarSlot(QString text)
{
    ui->statusBar->showMessage(text);
}

void MainWindow::cleanUp()
{
    qDebug() << "Cleaning up!";
    cObject->stage = 0;
    cThread->wait();
}

myobject.cpp：

#include "myobject.h"
#include <QPixmap>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

MyObject::MyObject(QObject *parent) :
    QObject(parent)
{
}

void MyObject::doWork()
{
    QThread::currentThread()->quit(); // It doesn't stop here. This is my issue.
    // I've trimmed the code here.
}

mainwindow.h：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void runThreadSlot();
    void setStatusBarSlot(QString);
    void cleanUp();

private:
    Ui::MainWindow *ui;
    QThread* cThread;
};

#endif // MAINWINDOW_H

myobject.h：

#ifndef MYOBJECT_H
#define MYOBJECT_H

#include <QtCore>

class MyObject : public QObject
{
    Q_OBJECT
public:
    explicit MyObject(QObject *parent = 0);
    QFile path;
    qint32 waitSecs;
    int stage;

signals:
    void setStatusBarSignal(QString);

public slots:
    void doWork();

};

#endif // MYOBJECT_H

Answer 1

QThread::quit()是异步的。您应该在退出后立即添加QThread::currentThread()->wait()。

线程拒绝退出

1 个答案: