The debugger pops up a dialog to inform you when this happens. Dev c++ make file 用法.
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Dev_broadcast_deviceinterface C K
P: n/a | My application is using RegisterDeviceNotification() to detect
attachment and removal of a USB HID-class device.
The form is receiving WM_DEVICECHANGE messages with wParam set to
DBT_DEVICEARRIVAL or DBT_DEVICEREMOVECOMPLETE.
I want to identify the device that has arrived or been removed by
examining the dbcc_name member of the DEV_BROADCAST_DEVICEINTERFACE
structure.
This is my declaration for DEV_BROADCAST_DEVICEINTERFACE:
<StructLayout(LayoutKind.Sequential)> _
Public Structure DEV_BROADCAST_DEVICEINTERFACE
Dim dbcc_size As Integer
Dim dbcc_devicetype As Integer
Dim dbcc_reserved As Integer
Dim dbcc_classguid As Guid
Dim dbcc_name As Short
End Structure
This is my code to call RegisterDeviceNotification:
Dim dbi As New DEV_BROADCAST_DEVICEINTERFACE
Dim size As Integer
size = Marshal.SizeOf(dbi)
dbi.dbcc_size = size
dbi.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE
dbi.dbcc_reserved = 0
dbi.dbcc_classguid = HidGuid 'obtained with HidD_GetHidGuid()
dbi.dbcc_name = 0
Dim buffer As IntPtr = Marshal.AllocHGlobal(size)
Marshal.StructureToPtr(dbi, Buffer, True)
Dim r As IntPtr
r = RegisterDeviceNotification(frmMy.Handle, buffer,
DEVICE_NOTIFY_WINDOW_HANDLE)
This is (a portion of) the WndProc subroutine:
Protected Overrides Sub WndProc(ByRef m As Message)
MyBase.WndProc(m)
Dim broadcastHeader As DEV_BROADCAST_HDR
Select Case m.Msg
'Look for a WM_DEVICECHANGE message.
Case WM_DEVICECHANGE
lstResults.Items.Add('WM_DEVICECHANGE')
If (m.WParam.ToInt32 = DBT_DEVICEARRIVAL) Then
lstResults.Items.Add('DBT_DEVICEARRIVAL')
'LParam is a pointer to a structure that begins with a
DEV_BROADCAST_HDR structure.
broadcastHeader = _
CType(m.GetLParam(broadcastHeader.GetType),
DEV_BROADCAST_HDR)
'Is it a device interface?
If (broadcastHeader.dbch_devicetype =
DBT_DEVTYP_DEVICEINTERFACE) Then
'LParam is a pointer to a DEV_BROADCAST_DEVICEINTERFACE
structure.
broadcastDeviceInterface = _
CType(m.GetLParam(broadcastDeviceInterface.GetType ),
DEV_BROADCAST_DEVICEINTERFACE)
lstResults.Items.Add('size = ' &
CStr(broadcastDeviceInterface.dbcc_size))
The dbcc_size parameter returns 194, but I've been unsuccessful at
retrieving broadcastDeviceInterface.dbcc_name. I've also tried
declaring dbcc_name in DEV_BROADCAST_DEVICEINTERFACE as:
<MarshalAs(UnmanagedType.LPTStr)> Dim dbcc_name As String
and:
Dim dbcc_name As String
and:
Dim dbcc_name as IntPtr
and using Marshal.PtrToStringAuto
Any suggestions welcome.
Jan Axelson
www.Lvr.com
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Dev Broadcast Deviceinterface
Retrieving dbccname string from a DEVBROADCASTDEVICEINTERFACE structure. Visual Basic.NET Forums on Bytes. Find answers to Cannot marshal string from DEVBROADCASTDEVICEINTERFACE in WMDEVICECHANGE message from the expert community at Experts Exchange. Find answers to Cannot marshal string from DEVBROADCASTDEVICEINTERFACE in WMDEVICECHANGE message from the expert community at Experts Exchange. How to get friendly device name from DEVBROADCASTDEVICEINTERFACE and Device Instance ID I've registered a window with RegisterDeviceNotification and can successfully recieve DEVBROADCASTDEVICEINTERFACE messages. However, the dbccname field in the returned struct is always empty. The struct I have is defined as such: StructLayout(Lay. By the way, I do not understand why you want to use IOCTL and not use the libusb-win32 API (from usb.h)? And what is the compiler you used?