QT的进程和线程

进程

线程

线程的创建与停止

线程的标识符 例子：

#ifndef DIALOG_H #define DIALOG_H #include <QDialog> #include "mythread.h" namespace Ui { class Dialog; } class Dialog : public QDialog { Q_OBJECT public: explicit Dialog(QWidget *parent = 0); ~Dialog(); private slots: void on_startButton_clicked(); void on_stopButton_clicked(); private: Ui::Dialog *ui; MyThread thread; }; #endif // DIALOG_H #include "dialog.h" #include "ui_dialog.h" Dialog::Dialog(QWidget *parent) : QDialog(parent), ui(new Ui::Dialog) { ui->setupUi(this); } Dialog::~Dialog() { delete ui; } // 启动线程按钮 void Dialog::on_startButton_clicked() { thread.start(); ui->startButton->setEnabled(false); ui->stopButton->setEnabled(true); } //　终止线程按钮 void Dialog::on_stopButton_clicked() { if (thread.isRunning()) { thread.stop(); ui->startButton->setEnabled(true); ui->stopButton->setEnabled(false); } } #ifndef MYTHREAD_H #define MYTHREAD_H #include <QThread> class MyThread : public QThread { Q_OBJECT public: explicit MyThread(QObject *parent = 0); void stop(); protected: void run(); private: volatile bool stopped; }; #endif // MYTHREAD_H #include "mythread.h" #include <QDebug> MyThread::MyThread(QObject *parent) : QThread(parent) { stopped = false; } void MyThread::run() { qreal i = 0; while (!stopped) { qDebug() << QString("in MyThread: %1").arg(i); msleep(1000); i++; } stopped = false; } void MyThread::stop() { stopped = true; }

方法二：使用moveToThread函数创建线程 例子：

#ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <buttoncontrol.h> #include <QTimer> #include <QThread> #include <work.h> #include <log_browser.h> namespace Ui { class Widget; } class Widget : public QWidget { Q_OBJECT public: explicit Widget(QWidget *parent = 0); ~Widget(); private: Ui::Widget *ui; ButtonControl *control; QTimer *timer; QThread *thread; QThread *thread1; Work *work; Log_browser *log_browser; public slots: void showtime(); }; #endif // WIDGET_H #include "widget.h" #include "ui_widget.h" #include<buttoncontrol.h> #include <QDateTime> #include <QDebug> #include <log_browser.h> Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); control=new ButtonControl(); control->setbutton(ui->pushButton); timer=new QTimer(this); timer->start(1000); connect(timer,SIGNAL(timeout()),this,SLOT(showtime())); work=new Work(); thread=new QThread(); work->moveToThread(thread); thread->start(); connect(ui->pushButton,SIGNAL(clicked()),work,SLOT(sleep())); } Widget::~Widget() { delete ui; } void Widget::showtime() { QString time=QDateTime::currentDateTime().toString(); ui->label->setText(time); } #ifndef WORK_H #define WORK_H #include <QObject> #include <QString> #include <QFile> class Work : public QObject { Q_OBJECT public: explicit Work(QObject *parent = nullptr); signals: void receive(QString str); void send(QString str); public slots: void sleep(); }; #endif // WORK_H #include "work.h" #include <QThread> #include <QDebug> #include <QFile> #include <QString> #include <QDateTime> Work::Work(QObject *parent) : QObject(parent) { } void Work::sleep() { qDebug()<<"正在执行线程"<<QThread::currentThreadId()<<QDateTime::currentDateTime().toString(); QThread::sleep(3); qDebug()<<"线程执行结束"<<QThread::currentThreadId()<<QDateTime::currentDateTime().toString(); }

同时启动多个线程

方法一：

MyThread *tread1; tread1 = new MyThread[LENGTH]; for(int i=0;i<=LENGTH-1;i++){ tread1[i].start(); }