[SOLVED] Cannot read second page scanned via ADF

Cannot read second page scanned via ADF

I have a Brother mutlifunction networked printer/scanner/fax (model MFC-9140CDN). I am trying to use the following code with WIA, to retrieve items scanned in with the document feeder:

const int FEEDER = 1;

var manager=new DeviceManager();
var deviceInfo=manager.DeviceInfos.Cast<DeviceInfo>().First();
var device=deviceInfo.Connect();
device.Properties["Pages"].set_Value(1);
device.Properties["Document Handling Select"].set_Value(1);

var morePages=true;
var counter=0;
while (morePages) {
    counter++;
    var item=device.Items[1];
    item.Properties["Bits Per Pixel"].set_Value(1);
    item.Properties["Horizontal Resolution"].set_Value(300);
    item.Properties["Vertical Resolution"].set_Value(300);

    var img=(WIA.ImageFile)item.Transfer();
    var path=String.Format(@"C:\Users\user1\Documents\test_{0}.tiff",counter);
    img.SaveFile(path);

    var status=(int)device.Properties["Document Handling Status"].get_Value();
    morePages = (status & FEEDER) > 0;
}

When the Transfer method is reached for the first time, all the pages go through the document feeder. The first page gets saved with img.SaveFile to the passed-in path, but all the subsequent pages are not available - device.Items.Count is 1, and trying device.Items[2] raises an exception.

In the next iteration, calling Transfer raises an exception -- understandably, because there are now no pages in the feeder.

How can I get the subsequent images that have been scanned into the feeder?

(N.B. Iterating through all the device properties, there is an additional unnamed property with the id of 38922. I haven't been able to find any reference to this property.)

Update

I couldn't find a property on the device corresponding to WIA_IPS_SCAN_AHEAD or WIA_DPS_SCAN_AHEAD_PAGES, but that makes sense because this property is optional according to the documentation.

I tried using TWAIN (via the NTwain library, which I highly recommend) with the same problem.

Solution

This is a networked scanner, and I was using the WSD driver.

Once I installed the manufacturer's driver, the behavior is as expected -- one page goes through the ADF, after which control is returned to the program.

(Even now, when I use WIA's CommonDialog.ShowSelectDevice method, the scanner is available twice, once using the Windows driver and once using the Brother driver; when I choose the WSD driver, I still see the issue.)