QProcess, how can I read standard out immediately ?

Msming

Code:

void MainWindow::windowInitialize()
{

    proxmarkProcess = new QProcess(this);

    proxmarkProcess->setProgram(PROCESS_PATH);
    connect(proxmarkProcess,SIGNAL(started()),this, SLOT(started()));
    connect(proxmarkProcess,SIGNAL(readyReadStandardError()),this, SLOT(readError()));
    connect(proxmarkProcess,SIGNAL(readyReadStandardOutput()),this, SLOT(readOutput()));
    //connect(proxmarkProcess,SIGNAL(readyRead()),this, SLOT(readyRead()));

    ui->cbb_Com->addItem(tr("请选择"));
    foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts()) {

        qDebug() << "Name : " << info.portName();
        qDebug() << "Description : " << info.description();
        qDebug() << "Manufacturer: " << info.manufacturer();

        ui->cbb_Com->addItem(info.portName());
    }
}


void MainWindow::on_cbb_Com_currentTextChanged(const QString &arg1)
{
    qDebug() << "当前串口："<<arg1 << arg1.size();

    if(arg1.contains("COM"))
    {


        if(proxmarkProcess->state() != QProcess::ProcessState::Running)
        {
            proxmarkProcess->setArguments(QStringList() << arg1 << "flush");
            proxmarkProcess->start();
            qDebug() << proxmarkProcess->arguments();
            proxmarkProcess->waitForStarted();
        }
        else
        {
            proxmarkProcess->kill();
            proxmarkProcess->waitForFinished();
            proxmarkProcess->setArguments(QStringList() << arg1 << "flush");
            proxmarkProcess->start();
            qDebug() << proxmarkProcess->arguments();
            proxmarkProcess->waitForStarted();
        }

    }
}
void MainWindow::readOutput(const QPrivateSignal s)
{
    Q_UNUSED(s)

     qDebug()<< "readOutput:";
//    QStringList strList = QString::fromLocal8Bit(proxmarkProcess->readAllStandardOutput().data()).split("\r\n");

//    foreach(const QString &str, strList)
//    {
//        qDebug()<< str;
//    }

}
}

void MainWindow::on_pushButton_clicked()
{
    if(QProcess::Running == proxmarkProcess->state())
    {
        qDebug() << "on_pushButton_clicked()";

        proxmarkProcess->write( QString("hw version\r\n").toStdString().c_str());
    }
}

当前串口： "请选择" 3
Name : "COM10"
Description : "USB 串行设备"
Manufacturer: "Microsoft"
当前串口： "COM10" 5
started()
("COM10", "flush")
Running
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
readOutput:
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
readOutput:
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
on_pushButton_clicked()
readOutput: