怎么捕获非标准usb设备插入或拔出消息？  收藏


我用mfc开发，用OnDeviceChange（UINT nEventType,DWORD_PTR dwData）消息回调函数来处理消息，但是一个奇怪的问题就是某些非标准usb设备（比如一些电子钥匙），插入或拔出的时候始终只发送 DBT_DEVNODES_CHANGED消息（即nEventType== 7）,而且dwData始终为0；但是如果插入一些普通U盘，就可以截获到DBT_DEVICEARRIVAL、 DBT_DEVICEREMOVECOMPLETE等消息。这是怎么回事那？
    另外，我想滤除其它usb设备插入与拔出时产生的DBT_DEVNODES_CHANGED消息，我该怎么办？一定要写过滤驱动程序吗？还有其它办法没有？
    多谢多谢！并祝愿大家十一和中秋双节快乐！


告诉你吧，这个得自己注册事件
BOOL CRSDlg::DoRegisterDeviceInterface(GUID InterfaceClassGuid, HDEVNOTIFY *hDevNotify)
{
DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
    DWORD Err;


    ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );
    NotificationFilter.dbcc_size = 32;
       // sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    NotificationFilter.dbcc_classguid = InterfaceClassGuid;


    *hDevNotify = RegisterDeviceNotification(GetSafeHwnd(), &NotificationFilter,
       DEVICE_NOTIFY_WINDOW_HANDLE    );
    if(!*hDevNotify)
    {
        Err = GetLastError();
CString str;
str.Format(_T(“RegisterDeviceNotification failed: %lx.”),Err);
        DT((LPCSTR)str);
        return FALSE;
    }
 DT(“RegisterDeviceNotification Successed :) ”);
//UnregisterDeviceNotification(*hDevNotify);
    return TRUE;
}


 检测 DBT_DEVNODES_CHANGED 要调用一下专用设备的SDK


 Scanning for attached USB devices:
USB Device 0: VendorID: 0×0451 ProductID 0×9001
OnDeviceChange message: 00000007 (DBT_DEVNODES_CHANGED)
OnDeviceChange message: 00000007 (DBT_DEVNODES_CHANGED)
Device successfully opened.
Get current device parameters was successful.
OnDeviceChange message: 00000007 (DBT_DEVNODES_CHANGED)


void USB_event::RegisterNotification()
{
DEV_BROADCAST_DEVICEINTERFACE devIF = {0};
devIF.dbcc_size = sizeof(devIF);
devIF.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
devIF.dbcc_classguid = GUID_INTERFACE_CP210x; //MY_DEVICE_GUID;
m_hNotifyDevNode = RegisterDeviceNotification(window_ptr->winId(),
&devIF, DEVICE_NOTIFY_WINDOW_HANDLE);
}


The GUID looks like this:
DEFINE_GUID(GUID_INTERFACE_CP210x, 0×993f7832, 0×6e2d, 0×4a0f, 0xb2, 0×72,
0xe2, 0xc7, 0×8e, 0×74, 0xf9, 0×3e);


Code Snippet


protected override void OnSourceInitialized(EventArgs e)


{


base.OnSourceInitialized(e);


HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;


if (hwndSource != null)


{


hwndSource.AddHook(new HwndSourceHook(this.hwndSourceHook));


}


}


IntPtr hwndSourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)


{


if (msg == Win32.WM_DEVICECHANGE)


{


if ((int)wParam == Win32.DBT_DEVICEARRIVAL)


{


RaiseDeviceArrived();


}


else if ((int)wParam == Win32.DBT_DEVICEREMOVECOMPLETE)


{


RaiseDeviceRemoved();


}


}


return IntPtr.Zero;


}

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十月 29, 2009 at 3:35 上午 by yippee 58 次
Category: Info
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