在Qt上检测到新的usb设备已连接/断开

#include <QCoreApplication>
#include <QDeviceWatcher>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QDeviceWatcher deviceWatcher;
    deviceWatcher.start();

    QObject::connect(&deviceWatcher, &QDeviceWatcher::deviceAdded, [](const QString &device) {
        qDebug() << "New device connected:" << device;
        // 在这里可以执行相应的操作，比如打开设备、读取设备信息等
    });

    QObject::connect(&deviceWatcher, &QDeviceWatcher::deviceRemoved, [](const QString &device) {
        qDebug() << "Device disconnected:" << device;
        // 在这里可以执行相应的操作，比如关闭设备、保存设备状态等
    });

    return a.exec();
}