QT多线程与GUI更新

// WorkerThread.h
#include <QThread>

class WorkerThread : public QThread
{
    Q_OBJECT

public:
    void run() override;

signals:
    void resultReady(const QString& result);
};

// WorkerThread.cpp
#include "WorkerThread.h"

void WorkerThread::run()
{
    // 耗时操作
    QString result = doSomeWork();

    // 发送信号，将结果传递给主线程
    emit resultReady(result);
}

// MainWindow.h
#include <QMainWindow>

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);

public slots:
    void handleResult(const QString& result);

private:
    WorkerThread m_workerThread;
};

// MainWindow.cpp
#include "MainWindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    // 连接信号和槽函数
    connect(&m_workerThread, &WorkerThread::resultReady, this, &MainWindow::handleResult);

    // 启动子线程
    m_workerThread.start();
}

void MainWindow::handleResult(const QString& result)
{
    // 在主线程中更新GUI
    ui->label->setText(result);
}