How to use scanner ADF with SANE in linux using Morena

Question

Hi! I'm using Morena libraries to access my scanner in my linux by the SANE backend. I'm able to scan one page, but I just can't scan all the pages on the scanner. I've tried loops and status but nothing successfull.
Using linux utility "scanadf" works great, it scans all the pages. I don't know what I'm missing.
Hope some one out there has used the Morena project to accesso SANE scanners.
Best regards!

Answer 1

Hope, that something of the below will help:
According to the Sane specification, Sane backend (i.e. scanner) should report the "out of paper" situation by returning SANE_STATUS_NO_DOCS status code. Some backends do it by default, some require to set a special sane option, so that they accept the fact that "application wants to use ADF". E.q. when you scan multiple papers using ADF just by default options with our scanner HP ScanJet 6300C, it will result in endless repeated scans. In that situation you need to examine the list of backend's options and find the appropriate adf option name. In case of our HP ScanJet scanner, you need to call setOption("source", "ADF");
Is is possible, that some backends need to be inform to pull the next paper into the adf (something like change document option).
How To detect out of paper using Morena
1) Morena produces acquired data via Java ImageProducer interface. When image was acquired correctly, it will send imageComplete(ImageConsumer.STATICIMAGEDONE). When some error occurs, it will send imageComplete(ImageConsumer.IMAGEERROR). Developer can track these values. MorenaImage class has it's own getStatus() method, which reflects these values. Here is an example how to:
MorenaImage image;
SaneSource source=SaneConnection.selectSource(null);
source.setResolution(100);
source.setOption("mode", "Color");
source.setOption("source", "ADF");
do
{ image = new MorenaImage(source);
System.out.println("Size of acquired image is " + image.getWidth() + " x " + image.getHeight() + " x " + image.getPixelSize() + ", image.getStatus=" + image.getStatus());
} while (image.getStatus() == ImageConsumer.STATICIMAGEDONE);
2) When developer decides not to buffer the acquired image, it is possible to omit MorenaImage class:
Image image;
SaneConnection saneConnection=null;
try
saneConnection = SaneConnection.connect("localhost");
SaneSource source=saneConnection.selectSource(null,null);
source.setOption("mode", "Color");
source.setResolution(100);
source.setOption("source", "ADF");
do
image=Toolkit.getDefaultToolkit().createImage(source);
MediaTracker tracker=new MediaTracker(this);
tracker.addImage(image, 0);
try
{ tracker.waitForAll();
catch (InterruptedException e)
{ e.printStackTrace();
tracker.removeImage(image);
System.out.println("Size of acquired image is " + image.getWidth(this) + " x " + image.getHeight(this) + ", saneConnection.getResultCode()=" + saneConnection.getResultCode());
} while (saneConnection.getResultCode() != SaneConstants.SANE_STATUS_NO_DOCS);
catch (Exception e)
{ e.printStackTrace();
finally
{ if(null!=saneConnection)
try
{ saneConnection.close();
catch (Exception e)
{ e.printStackTrace();
3) Quit simple solution is to detect a size of the acquired images. If the size = 0 (or -1 in some scanners), stop the scanning.
Martin Motovsky