如何向另一个线程发出带有数组参数的信号

Question

我是 Qt 的新手，我想用一些参数从 QThread 向主线程发出信号。它不起作用。我做错了什么？

//reader.h
signals:
        void updateData(quint16 fw, QString serial, quint16 *calibration);
//reader.cpp
...
{
    quint16 calibration[8];
    quint16 fw;
    QString serialNumber;
    readData(&fw, &serialNumber, calibration);
    // Declaration: void Reader::readData(quint16 *fw, QString *serial, quint16 *calibration) 
    emit updateData(fw, serialNumber, calibration); // In this function all parameters are assigned correctly
}
//mainwindow.h
 public slots:       
            void updateData(quint16 fw, QString serialNumber, quint16 *calibration);
//mainwindow.cpp
void MainWindow::updateData(quint16 fw, QString serialNumber, quint16 *calibration)
{   
    ui->lineEditFW->setText(QString::number(fw));     // correct
    ui->lineEditSerialNumber->setText(serialNumber);  // correct
    ui->spinBoxReg1->setValue(calibration[0]);        // incorrect!
    ui->spinBoxReg2->setValue(calibration[1]);        // ..array calibration
    ui->spinBoxReg3->setValue(calibration[2]);        // ..is filled with
    ui->spinBoxReg4->setValue(calibration[3]);        // ..random data!
    ui->spinBoxReg5->setValue(calibration[4]);
    ui->spinBoxReg6->setValue(calibration[5]);
    ui->spinBoxReg7->setValue(calibration[6]);
    ui->spinBoxReg8->setValue(calibration[7]);
}
//...
init()
{
   // other connection of thread and reader object
   //...
   connect(reader, SIGNAL(updateData(quint16, QString, quint16 *)), this, SLOT(updateData(quint16, QString, quint16 *)));
   //...
   reader->moveToThread(readerThread);
   readerThread->start();
}

我也试过用数组代替指针。它也没有用。

谢谢。

Answer 1

校准[8]在堆栈上，所以当你的reader函数returns时它被销毁了。你需要让它持久化（在堆上分配它），这样当信号传递时它仍然存在。

如何向另一个线程发出带有数组参数的信号

How to emit a signal with array parameter to another Thread

c++

qt

signals

qthread

slot