C++&&Qt + 进度框&&线程使用 + 处理耗时操作

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QThreadPool> #include <QtConcurrent> #include <QDebug> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); m_nMax = 20; m_pDlgProgress = new C_DlgProgress(this); m_pDlgProgress->setRange(0, m_nMax); m_pDlgProgress->close(); // 1. 继承QThread m_pTread = new C_Thread(m_nMax, this); connect(m_pTread, &C_Thread::emit_sendValue, this, [=](int nValue){ m_pDlgProgress->setValue(nValue); }); // 2. 继承QRunnable m_pThreadRunnable = new C_ThreadRunnable(m_nMax); connect(m_pThreadRunnable, &C_ThreadRunnable::emit_sendValue, this, [=](int nValue){ m_pDlgProgress->setValue(nValue); }); // 3. 继承QObject m_pThreadObject = new C_ThreadObject(m_nMax); connect(this, &MainWindow::emit_start, m_pThreadObject, &C_ThreadObject::slot_dealValue); connect(m_pThreadObject, &C_ThreadObject::emit_sendValue, this, [=](int nValue){ m_pDlgProgress->setValue(nValue); }); m_pThreadUsedObject = new QThread(this); m_pThreadObject->moveToThread(m_pThreadUsedObject); m_pThreadUsedObject->start(); // 0. 在主线程处理耗时操作 connect(this, &MainWindow::emit_sendValue, this, [=](int nValue){ m_pDlgProgress->setValue(nValue); }); } MainWindow::~MainWindow() { if(m_pThreadUsedObject) { m_pThreadUsedObject->quit(); m_pThreadUsedObject->wait(); } delete ui; } void MainWindow::dealValue() { int i = 0; while (i < m_nMax) { QThread::msleep(100); ++i; emit emit_sendValue(i); } } void MainWindow::on_btn_TimeConsumingOperation_clicked() { m_pDlgProgress->show(); // 0. 在主线程模拟处理耗时操作，界面卡死 // int i = 0; // while (i < m_nMax) { // QThread::msleep(100); // ++i; // emit emit_sendValue(i); // } /*********** 使用哪个，打开哪个注释 ***********/ // 1. 继承QThread m_pTread->start(); // 2. 继承QRunnable // QThreadPool::globalInstance()->start(m_pThreadRunnable); // 3. 继承QObject // emit emit_start(); // 4. 使用QtConcurrent模块 // QtConcurrent::run(this, &MainWindow::dealValue); }