USB的问题，如何知道向U盘中拷贝的什么文件，如何区分USB插入的是U盘还是鼠标

        [StructLayout(LayoutKind.Sequential)]

        public struct DEV_BROADCAST_VOLUME

        {

            public int dbcv_size;

            public int dbcv_devicetype;

            public int dbcv_reserved;

            public int dbcv_unitmask;

        }



        protected override void WndProc(ref Message m)

        {

            // 可以在dbt.h和winuser.h中找到这些定义

            // 发生设备变动

            const int WM_DEVICECHANGE = 0x0219;

            // 系统检测到一个新设备

            const int DBT_DEVICEARRIVAL = 0x8000;

            // 系统完成移除一个设备

            const int DBT_DEVICEREMOVECOMPLETE = 0x8001;

            // 逻辑卷标

            const int DBT_DEVTYP_VOLUME = 0x00000002;



            switch (m.Msg)

            {

                case WM_DEVICECHANGE:

                    switch (m.WParam.ToInt32())

                    {

                        case DBT_DEVICEARRIVAL:

                            int devType = Marshal.ReadInt32(m.LParam, 4);

                            if (devType == DBT_DEVTYP_VOLUME)

                            {

                                DEV_BROADCAST_VOLUME vol;

                                vol = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(

                                    m.LParam, typeof(DEV_BROADCAST_VOLUME));



                                MessageBox.Show(vol.dbcv_unitmask.ToString("x"));

                            }

                            break;

                        case DBT_DEVICEREMOVECOMPLETE:

                            MessageBox.Show("Removal");

                            break;

                    }

                    break;

            }

            //we detect the media arrival event 

            base.WndProc(ref m);

        }

补充：.NET技术 ,  C#

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