How to get the scanner resolution list

Hi.



I develop WIA scan app using Windows.Device.Scan API.

http://ift.tt/1kw2BeZ

I want to get the scanner resolution list which is supported by the target device, but Scan API does not have such function according to my study.



However, in spite of metro app, the preinstalled app on Windows8.1 can get the scanner resolution list .

How to get the scanner resolution list in my App?

Sorry for my poor English.

thanks.