widget.h Example File

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  #ifndef WIDGET_H
  #define WIDGET_H

  #include <QtWidgets/QWidget>
  #include <QtCharts/QChartGlobal>

  QT_CHARTS_BEGIN_NAMESPACE
  class QLineSeries;
  class QChart;
  QT_CHARTS_END_NAMESPACE

  QT_CHARTS_USE_NAMESPACE

  class XYSeriesIODevice;

  class QAudioInput;

  class Widget : public QWidget
  {
      Q_OBJECT

  public:
      Widget(QWidget *parent = 0);
      ~Widget();

  private:
      XYSeriesIODevice *m_device;
      QChart *m_chart;
      QLineSeries *m_series;
      QAudioInput *m_audioInput;
  };

  #endif // WIDGET_H