is device interface path (DevicePath) persistent ?

Is device interface path [ i.e. the DevicePath parameter of the
SetupDiOpenDeviceInterface function or DevicePath member of the
SP_DEVICE_INTERFACE_DETAIL_DATA structure ] persistent
1) between reboots? I.e. will sequential SetupDi*-style enumerations made in
the same Windows session give the same DevicePath for the same device
interface?
2) over reboots? i.e. will enumerations before and after reboot give the
same DevicePath for the same device interface ?
Many thanks!
Igor.

Doron
Thu Jun 30 03:08:23 CDT 2005

it is the same across reboots if and only if the device is plugged into the
same slot/hub/connection point. if it is the same device plugged into
another connection point, even though the device is the same, the path will
not be. why do you need to store the path?
d


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"igor" <no-spam@hotmail.com> wrote in message
news:OyAHV2NfFHA.3940@tk2msftngp13.phx.gbl...
> Is device interface path [ i.e. the DevicePath parameter of the
> SetupDiOpenDeviceInterface function or DevicePath member of the
> SP_DEVICE_INTERFACE_DETAIL_DATA structure ] persistent
> 1) between reboots? I.e. will sequential SetupDi*-style enumerations made
> in the same Windows session give the same DevicePath for the same device
> interface?
> 2) over reboots? i.e. will enumerations before and after reboot give the
> same DevicePath for the same device interface ?
> Many thanks!
> Igor.
>

Doron
Fri Jun 09 01:08:47 CDT 2006

yes if and only if the device is plugged into the same slot/port or it has a
unique ID (like a serial number) on the bus

d

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"igor" <no-spam@hotmail.com> wrote in message
news:OyAHV2NfFHA.3940@tk2msftngp13.phx.gbl...
> Is device interface path [ i.e. the DevicePath parameter of the
> SetupDiOpenDeviceInterface function or DevicePath member of the
> SP_DEVICE_INTERFACE_DETAIL_DATA structure ] persistent
> 1) between reboots? I.e. will sequential SetupDi*-style enumerations made
> in the same Windows session give the same DevicePath for the same device
> interface?
> 2) over reboots? i.e. will enumerations before and after reboot give the
> same DevicePath for the same device interface ?
> Many thanks!
> Igor.
>