About Kodak scanner i1220 second scan failed

[yewanji]

Recently, when I scanned with this product, I found that the first scan was successful and there was no problem. However, in the second scan, there were serious problems. I searched for a long time, but I could not solve them，I simulate a web project in the example below. When the scan is finished, sleep for 5 seconds and start the scan again

public class TwainExample implements ScannerListener {

static TwainExample app;

Scanner scanner;

public TwainExample() throws ScannerIOException {
    scanner = Scanner.getDevice();
    scanner.addListener(this);
    scanner.acquire();
}

public void update(ScannerIOMetadata.Type type, ScannerIOMetadata metadata) {
    if (type.equals(ScannerIOMetadata.ACQUIRED)) {
        System.out.println("Have an image now!");
    } else if (type.equals(ScannerIOMetadata.NEGOTIATE)) {
        ScannerDevice device = metadata.getDevice();
        try {
            device.setShowUserInterface(false);
            device.setShowProgressBar(true);
            device.setResolution(100);
        } catch (Exception e) {
            e.printStackTrace();
        }
    } else if (type.equals(ScannerIOMetadata.STATECHANGE)) {
        System.err.println("current state"+metadata.getStateStr());
        if (metadata.isFinished()) {
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("sleep done restart my job");
            try {
                scanner.acquire();
            } catch (ScannerIOException e) {
                e.printStackTrace();
            }
        }
    } else if (type.equals(ScannerIOMetadata.EXCEPTION)) {
        metadata.getException().printStackTrace();
    }
}

//The error log is as follows uk.co.mmscomputing.device.twain.TwainIOException: uk.co.mmscomputing.device.twai n.TwainScanner.setException: jtwain: EXCEPTION 0xC00000FD thrown in twain source or source manager. This may have left the twain subsystem in an unstable state. Please restart application or web-browser. at uk.co.mmscomputing.device.twain.TwainScanner.signalException(TwainSca nner.java:131) at uk.co.mmscomputing.device.twain.jtwain.signalException(jtwain.java:28 7) at uk.co.mmscomputing.device.twain.jtwain.cbexecute(jtwain.java:243) at uk.co.mmscomputing.device.twain.jtwain.nstart(Native Method) at uk.co.mmscomputing.device.twain.jtwain.access$200(jtwain.java:12) at uk.co.mmscomputing.device.twain.jtwain$1.run(jtwain.java:338) uk.co.mmscomputing.device.twain.TwainException: jtwain: EXCEPTION 0xC00000FD thr own in twain source or source manager. This may have left the twain subsystem in an unstable state. Please restart application or web-browser. at uk.co.mmscomputing.device.twain.jtwain.ncallSourceManager(Native Meth od) at uk.co.mmscomputing.device.twain.jtwain.callSourceManager(jtwain.java: 104) at uk.co.mmscomputing.device.twain.TwainSourceManager.call(TwainSourceMa nager.java:24) at uk.co.mmscomputing.device.twain.TwainIdentity.open(TwainIdentity.java :70) at uk.co.mmscomputing.device.twain.TwainSource.open(TwainSource.java:99)

    at uk.co.mmscomputing.device.twain.TwainSourceManager.openSource(TwainSo

urceManager.java:93) at uk.co.mmscomputing.device.twain.jtwain.cbexecute(jtwain.java:234) at uk.co.mmscomputing.device.twain.jtwain.nstart(Native Method) at uk.co.mmscomputing.device.twain.jtwain.access$200(jtwain.java:12) at uk.co.mmscomputing.device.twain.jtwain$1.run(jtwain.java:338) //This question has puzzled me for a long time

[Jugen]

@yewanji I've had a similar problem I think. Recently I tried using a static instance of Scanner and that seemed to help:

private static Scanner scanner = Scanner.getDevice();
private static ScannerListener prevListener;

public TwainExample() throws ScannerIOException {
    if ( prevListener != null ) scanner.removeListener( prevListener );
    scanner.addListener( this );
    prevListener = this;
    scanner.acquire();
}