twain4java
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DenisLAD
Crashing behavior
When we calling the scanning action to the second time the application get crashed
Can you provide additional information?
Kind error: ?
Log outputs: ?
Scanner vendor: HP, Canon, ...
JVM Version: JDK? 32 or 64 bits VM?
Windows version: ?
JDK 1.8 64x The way you calling the functions Like singleton utility class using windows 10 Testing using epson DS-530
/**
* Singleton class for managing Twain operations.
*
* Author: ahmad.a
*/
public final class RFTwainManager {
// The single instance of the RFTwainManager class
private static RFTwainManager instance;
private int color = 0;
boolean acquisitionComplete = false;
private final Object lock = new Object();
private CountDownLatch latch = new CountDownLatch(1);
// Private constructor to prevent instantiation from outside the class
private RFTwainManager() {
}
/**
* Get the singleton instance of RFTwainManager.
*
* @return the singleton instance
*/
public static synchronized RFTwainManager getInstance() {
if (instance == null) {
instance = new RFTwainManager();
}
return instance;
}
/**
* Get a list of available Twain sources.
*
* @return a list of available sources
*/
public List<Source> getAvailableSources() {
List<Source> lsSource = new ArrayList<>();
try {
lsSource = SourceManager.instance().getSources();
} catch (TwainException ex) {
Logger.getLogger(RFTwainManager.class.getName()).log(Level.SEVERE, null, ex);
}
return lsSource;
}
public boolean selectSourceDevice(String sourceName) {
if (sourceName == null) {
return false;
}
try {
TwainScanner.getScanner().select(sourceName);
TwainSource ts = Twain.getSourceManager().selectSource(sourceName);
ts.open();
ts.setState(4);
if (!ts.isDeviceOnline()) {
return false;
}
try {
// get the available resolutions if need it
TwainCapability tc = ts.getCapability(Twain.ICAP_XRESOLUTION);
//get the color mode :
tc = ts.getCapability(Twain.ICAP_PIXELTYPE);
for (Object t : tc.getItems()) {
color = (Integer) t;
if (color == 1) { // color mode support colors
break;
}
}
if (ts.getCapability(Twain.CAP_FEEDERENABLED).intValue() == 1) {
}
return true;
} finally {
ts.close();
ts.setState(3);
}
} catch (TwainException ex) {
Message.showMessageDialog(MessageType.Error, "Error", ex.getMessage());
}
return false;
}
/**
* Acquire an image from the specified source.
*
* @param sourceName the name of the Twain source
* @return the path of the acquired image
*/
public String acquireImage(String sourceName) {
List<File> files = new ArrayList<>();
final TwainScanner scanner = TwainScanner.getScanner();
// Runnable to handle Twain events
Runnable listenerRunnable = new Runnable() {
@Override
public void run() {
TwainListener listener = new TwainListener() {
@Override
public void update(TwainIOMetadata.Type type, TwainIOMetadata metadata) {
if (type == TwainIOMetadata.EXCEPTION) {
Message.showMessageDialog(MessageType.Warning, "Warning", metadata.getException().getMessage());
return;
}
if (type == TwainIOMetadata.NEGOTIATE && metadata.getState() == 4) {
TwainSource ts = metadata.getSource();
ts.setXferMech(Twain.TWSX_NATIVE);
try {
ts.setShowUI(false);
ts.setShowProgressBar(false);
ts.setCapability(Twain.ICAP_PIXELTYPE, color);
ts.setCapability(Twain.CAP_FEEDERENABLED, false);
} catch (Exception e) {
scanner.removeListener(this);
ts.setCancel(true);
}
}
boolean finish = false;
if (type == TwainIOMetadata.MEMORY || (type == TwainIOMetadata.ACQUIRED && metadata.getState() == 7)) {
finish = true;
}
if (finish) {
final BufferedImage img = metadata.getImage();
metadata.setImage(null);
try {
File f = File.createTempFile("scan", ".png");
try (ImageOutputStream ios = new FileImageOutputStream(f)) {
ImageIO.write(img, "PNG", ios);
}
synchronized (lock) {
files.add(f);
acquisitionComplete = true;
scanner.removeListener(this);
latch.countDown(); // Signal that acquisition is complete
}
} catch (IOException e) {
Message.showMessageDialog(MessageType.Warning, "Warning", e.getMessage());
}
}
}
};
scanner.addListener(listener);
}
};
Thread listenerThread = new Thread(listenerRunnable);
listenerThread.start();
try {
scanner.select(sourceName);
scanner.acquire();
// Wait until the image acquisition is complete
waitForAcquisition();
} catch (TwainException ex) {
Logger.getLogger(RFTwainManager.class.getName()).log(Level.SEVERE, null, ex);
} finally {
}
return files.isEmpty() ? "" : files.get(0).getAbsolutePath();
}
private void waitForAcquisition( ) {
synchronized (lock) {
while (!acquisitionComplete) {
try {
lock.wait(); // Wait until notified
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // Restore interrupted status
// Optionally, handle interruption
}
}
}
}
}
Thank you for this project now after some Changing of my code it's working perfect But when I try to pass show UI flag true it's not working and not shown any action
Sorry, for long answer. UI it's driver feature. It could be unaccesible from the library.
You could check it on your device
TwainSource.isUIControllable();