Re: How to determine whether two USB HID device interfaces belong to same or different device?

From: Doron Holan [MS] (doronh_at_nospam.microsoft.com)
Date: 09/06/04 

Date: Mon, 6 Sep 2004 08:22:31 -0700

call SetupDiGetDeviceInterfaceDetail and pass in the optional
PSP_DEVINFO_DATA . SP_DEVINFO_DATA::DevInst is the field you want

d 

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"MS" <shyang1234@hotmail.com> wrote in message 
news:esiJ78$kEHA.3432@TK2MSFTNGP14.phx.gbl...
> How to get the DevInst for the interface? Could you tell me that? Thanks.
>
> "Doron Holan [MS]" <doronh@nospam.microsoft.com> ¦b¶l¥ó
> news:OyQcr9JkEHA.2340@TK2MSFTNGP11.phx.gbl ¤¤¼¶¼g...
>> when using SetupDi to enumerate the interfaces, you can also acquire the
>> DevInst for the interface.  once you have the DevInst, you can use the
>> CM_Xxx APIs to walk the device tree.  in our case, you would use the
> DevInst
>> and call (I think) CM_Get_Parent to get the parent DevInst.  you then
>> compare the parent DevInsts among the interfaces and you can group this
> way.
>>
>> d
>>
>>
>> -- 
>> Please do not send e-mail directly to this alias. this alias is for
>> newsgroup purposes only.
>> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>>
>>
>> "MS" <shyang1234@hotmail.com> wrote in message
>> news:OTekgiBkEHA.548@TK2MSFTNGP11.phx.gbl...
>> > Hi, all,
>> >    I attach two same USB HID devices into PC. The HID device has two
>> > reports which means two device interface in Windows. By using SetupDi
> APIs
>> > with HID GUID and HidP_GetCaps with the check of my VID and PID, I 
>> > could
>> > find 4 device interfaces of my two HID devices. The problem is that I
>> > could
>> > not determine which two device interfaces belong to the same device. Is
>> > there any method to determine that?
>> >
>> >
>>
>>
>
>

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