Detect USB insertion and removal events

Question: sumoyu () reputation: Level 100: user1 Date: 10:12:51

USB insertion or removal is monitored to obtain the drive letter. The event wm_devicechange can monitor insertion and removal, how to determine whether to insert or remove the drive letter, and how to obtain the drive letter.

Reply:

Respondent: ffsb (for petty assets) Credit: 100 level: user2 Date: 11:07:49 ID: 37208771

Form1::OnCreate    //================Dev Notfi============================    DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;    ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );    NotificationFilter.dbcc_size =        sizeof(DEV_BROADCAST_DEVICEINTERFACE);    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;    NotificationFilter.dbcc_classguid = g_UsbioID;    DevNotify = RegisterDeviceNotification( Handle,        &NotificationFilter,        DEVICE_NOTIFY_WINDOW_HANDLE    );==========================//---------------------------------------------------------------------------void __fastcall TDCForm::WMDeviceChange(TMessage & Msg){    if(Msg.WParam == DBT_DEVICEARRIVAL)    {        PDEV_BROADCAST_HDR hDev = (PDEV_BROADCAST_HDR)Msg.LParam;        if(hDev->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)        {// Do nothing!        }    }    else if(Msg.WParam == DBT_DEVICEREMOVECOMPLETE)    {        PDEV_BROADCAST_HDR hDev = (PDEV_BROADCAST_HDR)Msg.LParam;        if(hDev->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)        {if(DisconnBtn->Enabled)        {DisconnBtn->Click();        }        }    }}

Respondent: ffsb (for petty assets) Credit: 100 level: user2 Date: 11:09:09 ID: 37208826

This is a bit messy.

Respondent: sumoyu () reputation: 100 level: user1 Date: 11:12:45 ID: 37208961

Thank you! Try me

Respondent: sumoyu () reputation: 100 level: user1 Date: 11:21:04 ID: 37209265

What is g_usbioid?

Respondent: ffsb (for petty assets) Credit: 100 level: user2 Date: 11:51:19 ID: 37210214

USB hardware ID,

Respondent: sumoyu () reputation: 100 level: user1 Date: 12:42:52 ID: 37211248

How to obtain the hardware ID? During debugging, I tracked and found that MSG. wparam = dbt_devnodes_changed

Respondent: ffsb (for petty assets) Credit: 100 level: user2 Date: 14:00:41 ID: 37213378

Device_policy_window_handle ==> device_policy_window_handle | device_policy_all_interface_classes to track all USB devices.

Respondent: cczlp (not confused) reputation: 117 level: star2 Date: 14:01:41 ID: 37213414

When msg. wparam = dbt_devnodes_changed, take the number of specified devices, increase is insert, decrease is remove.

Respondent: sumoyu () reputation: 100 level: user1 Date: 15:05:05 ID: 37215482

After USB is removed, an event msg. wparam = dbt_deviceremovecomplete is generated, and an event msg. wparam = dbt_devnodes_changed is generated. After the USB is removed, the code in both events is executed (as if msg. wparam = dbt_devnodes_changed was executed first .) Also, you can use a function to obtain all USB guids.

Respondent: ffsb (for petty assets) Credit: 100 level: user2 Date: 15:31:02 ID: 37216498

Setupdixxxxx: I forgot the title. Check it.

 

Well, the above are all nonsense. Let's look at the masterworks:

Http://www.codeproject.com/Articles/14500/Detecting-Hardware-Insertion-and-or-Removal

Http://www.codeproject.com/Articles/119168/Hardware-Change-Detection

Generally, the imported registerdevicenotification-> GUID is not as elegant as you think. Read this blog:

Http://blogs.msdn.com/ B /doronh/archive/2006/02/15/532679.aspx