code_app/app/scantool/dialog_scan.h

#ifndef DIALOG_SCAN_H
#define DIALOG_SCAN_H

#include <QDialog>
#include <vector>
#include "sane/sane_ex.h"
#include "sane/sane_option_definitions.h"

namespace Ui {
class Dialog_Scan;
}

class Dialog_Scan : public QDialog
{
    Q_OBJECT

    friend class MainWindow;
public:
    explicit Dialog_Scan(class MainWindow *mainWnd);
    ~Dialog_Scan();

private:
    static int sane_ex_callback(SANE_Handle hdev, int code, void* data, unsigned int* len, void* param);

protected:
    virtual void closeEvent(QCloseEvent *e) override;

signals:
    void deviceArrive(QString devName);
    void deviceRemove(QString devName);

private slots:
    void on_deviceArrive(QString devName);
    void on_deviceRemove(QString devName);

    void on_comboBox_currentIndexChanged(const QString &arg1);

private:
    Ui::Dialog_Scan *ui;
    class MainWindow *m_mainWnd;
    QString m_devName;
    SANE_Handle m_devHandle;
};

#endif // DIALOG_SCAN_H