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hidglobal / digitalpersona-devices

DigitalPersona Security Devices support library
https://hidglobal.github.io/digitalpersona-devices/index.html
MIT License
64 stars 41 forks source link

Device Id #35

Closed crissulb95 closed 1 year ago

crissulb95 commented 1 year ago

hello again.

Im trying to get a unique id from my fingerprint reader, but anytime i disconnect and connect my device on any pc and try to get it to log into the console thru getDeviceInfo(deviceId) method, is never the same.

Is it like this on purpose or is something else happening?

a-bronx commented 1 year ago

Hello!

A word from a WebSdk developer:

Not all fingerprint devices are having unique deviceId. Different devices from different vendors have different approaches and most of the devices have no any unique Id associated with it. From our point of view if device does not have any persistent unique device Id we would randomly generate it when device gets connected to USB. To know if device has persistent or volatile you would need call getDeviceInfo() and check DeviceInfo.eUidType field of a DeviceUidType type. The DeviceUidType enumeration lists types of unique identifiers of fingerprint readers:

enum DeviceUidType {
    Persistent = 0,
    Volatile = 1,    
}

So if eUidType set to 0, this means the deviceId is persistent and would not change after device was disconnected from USB and connected again. If eUidType set to 1, this means the deviceId is volatile and would change every time after device was disconnected from USB and connected again.

crissulb95 commented 1 year ago

Thanks for your quickly response!!