code_app/app/demo/mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "imgfmt/HGImgFmt.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_devUserMgr = new DeviceUserMgr(this);
    m_devUser = nullptr;
    ui->label_currDevName->setText(tr("no dev"));
}

MainWindow::~MainWindow()
{
    if (nullptr != m_devUser)
    {
        disconnect(m_devUser, SIGNAL(newImage(void*)), this, SLOT(on_newImage(void*)));
        delete m_devUser;
        m_devUser = nullptr;
    }

    delete m_devUserMgr;
    m_devUserMgr = nullptr;

    delete ui;
}

void MainWindow::on_newImage(void *image)
{
    static int i = 0;
    char fileName[256];
    sprintf(fileName, "D:\\test_%d.jpg", i++);
    HGImgFmt_SaveImage((HGImage)image, 0, NULL, fileName);
    HGBase_DestroyImage((HGImage)image);
}

void MainWindow::on_pushButton_selectDev_clicked()
{
    if (nullptr != m_devUser)
    {
        disconnect(m_devUser, SIGNAL(newImage(void*)), this, SLOT(on_newImage(void*)));
        delete m_devUser;
        m_devUser = nullptr;
        ui->label_currDevName->setText(tr("no dev"));
    }

    DeviceUser *devUser = m_devUserMgr->OpenDeviceUser();
    if (devUser != nullptr)
    {
        m_devUser = devUser;
        connect(m_devUser, SIGNAL(newImage(void*)), this, SLOT(on_newImage(void*)));
        ui->label_currDevName->setText(m_devUser->GetName());
    }
}

void MainWindow::on_pushButton_setting_clicked()
{
    if (nullptr != m_devUser)
        m_devUser->ShowSettingDlg();
}

void MainWindow::on_pushButton_scan_clicked()
{
    if (nullptr != m_devUser)
        m_devUser->StartScan();
}