C ++ Qt不能使用SetNum和setEnabled

Question

void MainWindow::on_ParceButton_clicked()
{
    ui->ParceButton->setEnabled(false);
    int thr = ui->lineEdit4->text().toInt();
    ifstream inp_tmp("AllTempLinks.txt");
    runnedth=0;

    QNetworkAccessManager *nmanager = new QNetworkAccessManager;
    connect(nmanager, SIGNAL(finished(QNetworkReply*)), this, SLOT(FinishedSlot(QNetworkReply*)));
    string link;
    while(getline(inp_tmp,link))
    {
        QUrl req = QUrl(QString::fromStdString(link));

        while(runnedth >= thr)
        {
            QApplication::processEvents();
        }

        QNetworkReply* reply = nmanager->get(QNetworkRequest(req));
        ui->label_6->setNum(totalglinks);
    }


    inp_tmp.close();
    ui->ParceButton->setEnabled(true);
}

所有请求都已成功结束，但是ui-＆gt; label_6-＆gt; setNum（totalglinks）;不工作当我的函数调用时，ParceButton仍然有效。