Re: WM_DEVICECHANGE PARAMETERS

Hi,
I need to monitor several types of devices at the same time :
- keyboard (not all HID's)
- Comports
- Disks

Can I register multiple times for this ?

Greetings,
Rob.


"Doron Holan [MSFT]" wrote:

you need to register with a specific device interface. this tells you the
type of device. once you have the devicce instance path on the arrival
notification you can use setupdi to open up the properties for the device
and read the "ComPort" property (for a COM port)

d

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"Rob" <Rob@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:A51D55EF-F958-40F2-920C-1AD0DB3D73A8@xxxxxxxxxxxxxxxx
Hi,
I also had the problem that LParam is 0.
See codefragment below for the right (?) way to register, in order to
solve
that.

My problem is that when I plug in a device (like a COMPORT) I would like
to
know 2 things :
1) WHat kind of device was plugged (comport, I need the IF-GUID I think)
2) What it's devicename is (Like COM1:)

This seems impossible without to determine from the notification-info.
See : http://69.10.233.10/KB/cs/HardwareHelper.aspx
and : http://www.codeproject.com/KB/system/HwDetect.aspx?display=PrintAll

monitoring the entire devicelist seems the only option.
I hope I'm wrong about this.

Any tips ?


//****** CODE fragment: ******

DEV_BROADCAST_DEVICEINTERFACE NotificationFilter;
GUID tmp={0,0,0,""};
ZeroMemory( &NotificationFilter, sizeof(NotificationFilter) );

NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
NotificationFilter.dbcc_classguid = tmp;

m_hDevNotify = RegisterDeviceNotification(m_hWnd ,&NotificationFilter,
DEVICE_NOTIFY_WINDOW_HANDLE|DEVICE_NOTIFY_ALL_INTERFACE_CLASSES);

//****** end CODE fragment: ******



Greetings,
Rob.




"rseedle" wrote:

I am recieving the plug in / unplug events correctly but the WPARAM
always
has a 7 in it. If I understand correctly the WPARAM should specify the
values

DBT_DEVICEARRIVAL 0x8000
and
DBT_DEVICEREMOVECOMPLETE 0x8004

What is up with that ?

Randy Seedle


.

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