Automatic document feeder with hpaio backend

[Danilo Câmara]

I'm trying to scan from the ADF with hpaio backend using the latest source from the truncated_image_hack branch. The test case code is:

import java.io.IOException;
import java.net.InetAddress;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;

import au.com.southsky.jfreesane.SaneDevice;
import au.com.southsky.jfreesane.SaneException;
import au.com.southsky.jfreesane.SaneSession;
import au.com.southsky.jfreesane.SaneStatus;

public class Test {

    private static final Logger myLogger = Logger.getLogger("au.com.southsky.jfreesane");

    public static void main(String[] args) throws IOException, SaneException {
        // Turn up logging levels
        for (Handler handler : Logger.getLogger("").getHandlers()) {
            handler.setLevel(Level.FINE);
        }
        myLogger.setLevel(Level.FINE);

        SaneSession session = null;
        SaneDevice device = null;
        try {
            InetAddress address = InetAddress.getByName("localhost");
            session = SaneSession.withRemoteSane(address);

            device = session.getDevice("hpaio:/usb/Deskjet_4620_series?serial=CN582736YP47TN");

            device.open();

            device.getOption("source").setStringValue("ADF");     // [Flatbed], ADF
            device.getOption("mode").setStringValue("Color");     // [Lineart], Gray, Color
            device.getOption("resolution").setIntegerValue(200);  // 100, 200, 300, 600 (75)

            while (true) {
                try {
                    device.acquireImage();

                } catch (SaneException e) {
                    if (e.getStatus() == SaneStatus.STATUS_NO_DOCS) {
                        // this is the out of paper condition that we expect
                        break;
                    } else {
                        // some other exception that was not expected
                        throw e;
                    }
                }
            }

        } finally {
            if (device != null) try { device.close(); } catch (IOException e) { e.printStackTrace(); }
            if (session != null) try { session.close(); } catch (IOException e) { e.printStackTrace(); }
        }
    }
}

The output ends with:

...
FINE: Reached end of records
Sep 29, 2014 2:38:50 PM au.com.southsky.jfreesane.FrameInputStream readFrame
WARNING: truncated read (got 11,674,368, expected 14,187,600 bytes)
Sep 29, 2014 2:38:50 PM au.com.southsky.jfreesane.FrameInputStream readFrame
WARNING: padded image with 2,513,232 null bytes
Exception in thread "main" au.com.southsky.jfreesane.SaneException: STATUS_DEVICE_BUSY
    at au.com.southsky.jfreesane.SaneSession.acquireImage(SaneSession.java:134)
    at au.com.southsky.jfreesane.SaneDevice.acquireImage(SaneDevice.java:91)
    at Test.main(Test.java:39)
ABRT problem creation: 'success'

Maybe the STATUS_DEVICE_BUSY happens because the scanner is loading/ejecting the next pages in the ADF.

I try set A4 paper size (0, 0)->(210, 297). The padding reduced to 168,606 bytes and the exception was thrown. I could not find a size near A4 that didn't cause padding. The size (0, 0)->(130, 185) didn't cause padding but the exception happened anyway.

The full log is attached.

Regards

[Danilo Câmara]

If I try to wait after the first image is acquired, the next pages are ejected.

[James Ring]

I suspect there may be a spurious call to cancel() in there, will take a look when I get home. I'm going to add better logging in the process!

sent from my phone

On Sep 29, 2014 12:11 PM, "Danilo Câmara" <dfca...@gmail.com> wrote:

If I try to wait after the first image is acquired, the next pages are ejected.

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[James Ring]

Does it work with scanadf?

On Mon, Sep 29, 2014 at 12:10 PM, Danilo Câmara <dfca...@gmail.com> wrote:
> If I try to wait after the first image is acquired, the next pages are
> ejected.
>

[Danilo Câmara]

scanadf works

[James Ring]

Can you try commenting out line 181 of SaneSession.java:

cancelDevice(handle);

And see if that works?

[Danilo Câmara]

Yes, it works.

Thank you very much.

[James Ring]

Ok, it confirms my suspicion that we're sending sane_cancel at the
wrong time. Unfortunately it's not a quick fix, I'll have to sit down
and think about how to do it better. Referring to
http://www.sane-project.org/html/doc013.html, I think we need to keep
track of whether the device is in setup or image acquisition mode.
When in acquisition mode, any action taken by the user other than
acquireImage should cause cancel() to be sent first.