Qt從GUI線程停止工作線程循環

Question

我有一個工作線程，我試圖通過一個按鈕停止。 我有時會收到以下錯誤：

Fatal: QThread: Destroyed while thread is still running

這是我的代碼。 通過按下斷開連接按鈕，將發出信號以停止線程的while循環。

if (ui->connectButton->text() == "Connect") {
    mUDPThread = new QThread;
    mUDPWorker = new  UDPThread(ui->HostTextEdit->toPlainText(), ui->portTextEdit->toPlainText().toInt());
    mUDPWorker->moveToThread(mUDPThread);
    connect(mUDPThread, SIGNAL(started()), mUDPWorker, SLOT(process()));
    connect(mUDPWorker, SIGNAL(finished()), mUDPThread, SLOT(quit()));
    connect(mUDPWorker, SIGNAL(finished()), mUDPWorker, SLOT(deleteLater()));
    connect(mUDPWorker, SIGNAL(finished()), mUDPThread, SLOT(deleteLater()));
    connect(this, SIGNAL(onExitThread()), mUDPWorker, SLOT(onExitThread()));
    connect(this, SIGNAL(onDataIncome(QString)), mUDPWorker, SLOT(onDataIncome(QString)));
    mUDPThread->start();
    ui->connectButton->setText("Disconnect");
} else if (ui->connectButton->text() == "Disconnect") {
    emit onExitThread();
    ui->connectButton->setText("Connect");
}

工作線程：

void UDPThread::process() {
    while (isRunning) {
    QCoreApplication::processEvents();
      ...
    }
    emit finished();
}
void UDPThread::onExitThread() {
    qDebug() << "onExitThread" << isRunning;
    isRunning = false;
}

Answer 1

while (isRunning)

您正在此處阻塞線程，其事件循環無法旋轉以接收信號，它只能將信號發送給具有旋轉事件循環的其他線程。

您需要使工作人員無阻塞，將工作分成多個周期，在事件循環之間旋轉並接收信號。 用偽代碼：

if (isRunning) {
  doWorkCycle();
  scheduleNextWorkCycle();
} else emit finished();

您可以在此處查看一個示例。

Answer 2

解決了。 錯誤在連接命令內：

connect(mUDPWorker, SIGNAL(finished()), mUDPThread, SLOT(deleteLater()));

至

connect(mUDPThread, SIGNAL(finished()), mUDPThread, SLOT(deleteLater()));

結果：

connect(mUDPThread, SIGNAL(started()), mUDPWorker, SLOT(process()));
connect(mUDPWorker, SIGNAL(finished()), mUDPThread, SLOT(quit()));
connect(mUDPWorker, SIGNAL(finished()), mUDPWorker, SLOT(deleteLater()));
connect(mUDPThread, SIGNAL(finished()), mUDPThread, SLOT(deleteLater()));
connect(this, SIGNAL(onExitThread()), mUDPWorker, SLOT(onExitThread()));
connect(this, SIGNAL(onDataIncome(QString)), mUDPWorker, SLOT(onDataIncome(QString)));