Ndtyjky

I'm using the twain.jar to connect with Plustek SN8016U scanner.
Everything is working perfect if I plugged scanner before application running.

But if I start the application first with unplugged scanner device, after that I plugged scanner --> the exception is thrown by getDeviceNames method.

The below is demo code:

Scanner sc = Scanner.getDevice();

try {

    sc.getDeviceNames();

} catch (Exception e) {

    // Throw exception if I unplugged scanner before application running and plugged after

    e.printStackTrace();

}

I debug the code, it seen the data (indentity) is cached after jtwain init.
I try to re init the jtwain, but no affected.
The below is library code that I think have a issue:

public String getDeviceNames() throws ScannerIOException {

    Vector var1 = new Vector();

    jtwain.getIdentities(this, var1);

    String var2 = new String[var1.size()];

    Enumeration var3 = var1.elements();



    // TwainIdentity is cached hear. After I pluggin scanner, the vaule is not changed.

    for(int var4 = 0; var3.hasMoreElements(); ++var4) {

        TwainIdentity var5 = (TwainIdentity)var3.nextElement();



        var2[var4] = var5.getProductName();

    }



    return var2;

}

I use mmscomputing library at hear: https://www.programcreek.com/java-api-examples/index.php?source_dir=Classeur-master/mmscomputing/uk/co/mmscomputing/device/twain/pdfapplet/TwainPdfAppletExample.java#

Any body give me a help. Thanks you.