使用Qt c ++在Windows Surface Pro上获取Accelerometer数据？

Question

How can I get Accelerometer data on windows Surface pro using Qt c++? I tried the below code but it gives only 0,0,0 values in all scenarios. Please help me!

   QAccelerometer *accmeter = new QAccelerometer();

    accmeter->start();
    QAccelerometerReading *reading = new QAccelerometerReading();

    qreal x = reading->x();
    qreal y = reading->y();
    qreal z = reading->z();

    QMessageBox *box = new QMessageBox();
    box->setText("x="+ QString::number(x)+ "\n" "y="+ QString::number(y)+ "\n" "z="+ QString::number(z)+ "\n");
    box->exec();

Answer 1

To get the accelerometer data, it is recommended by the Qt company to listen to the signal readingChanged , as no data is immediately available after starting the sensor. You code would be shortened to something like this, with accMeter being changed to be a member of the class:

    accmeter = new QAccelerometer();
    connect(accmeter, SIGNAL(readingChanged()), this, SLOT(checkReading()));
    accmeter->start();

and then add a member function to your class called checkReading :

MyClass::checkReading() {
    qreal x = accmeter->reading()->x();
    qreal y = accmeter->reading()->y();
    qreal z = accmeter->reading()->z();
    QMessageBox *box = new QMessageBox();
    box->setText("x="+ QString::number(x)+ "\n" "y="+ QString::number(y)+ "\n" "z="+ QString::number(z)+ "\n");
    box->exec();
}

Note that in order to perfectly replicate the code you had above you should append disconnect(accmeter, SIGNAL(readingChanged()), this, SLOT(checkReading())); as the last line to the member function.