QT 监听 USB 设备 插入、拔出动作

#ifndef WIDGET_H
    #define WIDGET_H

    #include <QtGui/QWidget>

    #include <windows.h>
    #include <QString>

    class Widget : public QWidget
    {
        Q_OBJECT

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

    protected:
        bool winEvent(MSG *msg, long *result);

    private:
        //UsbConfig usbConfig;
        char FirstDriveFromMask (ULONG unitmask);
    };

    #endif // WIDGET_H

#include "qt_Watch/qwidget.h"
    #include <QDebug>

    #include <Windows.h>
    #include <dbt.h>

    Widget::Widget(QWidget *parent)
        : QWidget(parent)
    {
        setWindowFlags(Qt::Window); //窗口以Window为父窗口
    }

    Widget::~Widget()
    {
    }

    bool Widget::winEvent(MSG *msg,long *result)
    {
        int msgType = msg->message;
        if(msgType == WM_DEVICECHANGE)
        {
            qDebug() << "收到事件 " ;
            PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)msg->lParam;
            switch(msg->wParam)
            {
            case DBT_DEVICETYPESPECIFIC:
                {
                    qDebug() << "DBT_DEVICETYPESPECIFIC " ;
                    break;
                }
            case DBT_DEVICEARRIVAL:
                if (lpdb -> dbch_devicetype == DBT_DEVTYP_VOLUME)
                {
                    PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
                    if (lpdbv -> dbcv_flags == 0)
                    {
                        // 插入U盘，此处可以做你想做的事
                        QString USBDisk = QString(this->FirstDriveFromMask(lpdbv ->dbcv_unitmask));
                        qDebug() << "USB_Arrived and The USBDisk is: "<<USBDisk ;
                    }
                }
                qDebug() << "DBT_DEVICEARRIVAL" ;
                break;
            case DBT_DEVICEREMOVECOMPLETE:
                if (lpdb -> dbch_devicetype == DBT_DEVTYP_VOLUME)
                {
                    PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
                    if (lpdbv -> dbcv_flags == 0)
                    {
                        qDebug() << "USB_设备移除";
                    }
                }
                qDebug() << "DBT_DEVICEREMOVECOMPLETE" ;
                break;
            }
        }
        return false;
    }

    char Widget::FirstDriveFromMask (ULONG unitmask)
    {
        char i;

        for (i = 0; i < 26; ++i)
        {
            if (unitmask & 0x1)
                break;
            unitmask = unitmask >> 1;
        }
        return (i + 'A');
    }

#include <QApplication>
    #include "qt_Watch/qwidget.h"

    int main(int argc,char ** argv)
    {
        QApplication app(argc,argv);

        Widget widget;
        widget.show();

        return app.exec();
    }

转载自：http://blog.csdn.net/zhuyingqingfen/article/details/37726981