Detect a USB Device

I have a USB printer and I know its vendor ID and product ID. How can I know
it is connected from my C# application?

BTW, I am trying to use winapi calls not wmi.

"USB Device User" wrote:

> I have a USB printer and I know its vendor ID and product ID. How can I know
> it is connected from my C# application?

One way is via Setup API (it's a managed API so you will have to PInvoke
it). Start with function SetupDiGetClassDevs.

USB Device User wrote:
> BTW, I am trying to use winapi calls not wmi.
>
> "USB Device User" wrote:
>
>> I have a USB printer and I know its vendor ID and product ID. How can I know
>> it is connected from my C# application?

I tried SetupDi functions. It is easy for HID to get GUID and VID/PID. But
for general USB device, how can I get GUID and VID/PID from the api calls?

"Philip Ries [MSFT]" wrote:

> One way is via Setup API (it's a managed API so you will have to PInvoke
> it). Start with function SetupDiGetClassDevs.
>
> USB Device User wrote:
> > BTW, I am trying to use winapi calls not wmi.
> >
> > "USB Device User" wrote:
> >
> >> I have a USB printer and I know its vendor ID and product ID. How can I know
> >> it is connected from my C# application?
> .
>

"USB Device User" <> wrote in message
news:60FB1C84-C1E3-42EA-9848-...
> I tried SetupDi functions. It is easy for HID to get GUID and VID/PID. But
> for general USB device, how can I get GUID and VID/PID from the api calls?

Have you tried SetupDiGetClassDevs ?
-- pa

> "Philip Ries [MSFT]" wrote:
>
>> One way is via Setup API (it's a managed API so you will have to PInvoke
>> it). Start with function SetupDiGetClassDevs.
>>
>> USB Device User wrote:
>> > BTW, I am trying to use winapi calls not wmi.
>> >
>> > "USB Device User" wrote:
>> >
>> >> I have a USB printer and I know its vendor ID and product ID. How can
>> >> I know
>> >> it is connected from my C# application?
>> .
>>

Yes, I did. I can pass Null to enumerate all devices. But which api call
should I use to get VID/PID?

"Pavel A." wrote:

> "USB Device User" <> wrote in message
> news:60FB1C84-C1E3-42EA-9848-...
> > I tried SetupDi functions. It is easy for HID to get GUID and VID/PID. But
> > for general USB device, how can I get GUID and VID/PID from the api calls?
>
> Have you tried SetupDiGetClassDevs ?
> -- pa
>
> > "Philip Ries [MSFT]" wrote:
> >
> >> One way is via Setup API (it's a managed API so you will have to PInvoke
> >> it). Start with function SetupDiGetClassDevs.
> >>
> >> USB Device User wrote:
> >> > BTW, I am trying to use winapi calls not wmi.
> >> >
> >> > "USB Device User" wrote:
> >> >
> >> >> I have a USB printer and I know its vendor ID and product ID. How can
> >> >> I know
> >> >> it is connected from my C# application?
> >> .
> >>

> Yes, I did. I can pass Null to enumerate all devices. But which api call
> should I use to get VID/PID?

SetupDiGetDeviceRegistryProperty returns a hardware ID.

And there is a doc page about how the USB HW IDs are composed from VID/PID.

--
Maxim S. Shatskih
Windows DDK MVP

http://www.storagecraft.com

"Maxim S. Shatskih" <> wrote:
>
>> Yes, I did. I can pass Null to enumerate all devices. But which api call
>> should I use to get VID/PID?
>
>SetupDiGetDeviceRegistryProperty returns a hardware ID.
>
>And there is a doc page about how the USB HW IDs are composed from VID/PID.

Is there? The format has not changed since Windows 95 OSR2, but I thought
it was officially undocumented. Do you remember which page this is on?
--
Tim Roberts,
Providenza & Boekelheide, Inc.

Tim Roberts wrote:
> "Maxim S. Shatskih" <> wrote:
>>> Yes, I did. I can pass Null to enumerate all devices. But which api call
>>> should I use to get VID/PID?
>> SetupDiGetDeviceRegistryProperty returns a hardware ID.
>>
>> And there is a doc page about how the USB HW IDs are composed from VID/PID.
>
> Is there? The format has not changed since Windows 95 OSR2, but I thought
> it was officially undocumented. Do you remember which page this is on?

I recently stumbled into it in a section titled "Enumeration of USB
Composite Devices":

http://msdn.microsoft.com/en-us/libr...8VS.85%29.aspx

> Is there? The format has not changed since Windows 95 OSR2

There was an MSDN page somewhere which documents the PnP IDs layout for all common buses.

--
Maxim S. Shatskih
Windows DDK MVP

http://www.storagecraft.com