[sane-devel] Does driver know it is scannning or previewing now with XSane?

[eagleskycloud]

Hi,

I have two question :
  1.To scan multi images,input a number in left corner edit box to indicate
the image number of XSane would scan

    There is a sensor In ADF.  It  could detecte are there papers in
ADF.Upper application could know whether there are papers in ADF by status
of the sensor. Which is the better way to achieve scanning multi images
between input a number of scanning image and add a function?

 2.Does driver know it is scannning or previewing now with XSane?
    I have achieved ADF duplex scan. I want to know how to judge it is
scanning or previewing in my driver ,so I could  handle the ADF duplex
preview

Thank you
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