用java中的zxing扫描多个条形码
我需要读取TIFF的pdf417条形码。图像上通常有多个条形码- 这是我的代码：用java中的zxing扫描多个条形码,java,zxing,Java,Zxing,我需要读取TIFF的pdf417条形码。图像上通常有多个条形码- 这是我的代码： InputStream in = null; BufferedImage bfi = null; File[] files = new File(DIR).listFiles(); for (int i = 0; i < files.length; i++) { if (files[i].isFile()) {
InputStream in = null;
BufferedImage bfi = null;
File[] files = new File(DIR).listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
try {
System.out.println(files[i].getName());
in = new FileInputStream(files[i]);
bfi = ImageIO.read(in);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
if (bfi != null) {
LuminanceSource ls = new BufferedImageLuminanceSource(bfi);
BinaryBitmap bmp = new BinaryBitmap(new HybridBinarizer(ls));
Reader reader = new MultiFormatReader();
Result result = null;
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
try {
result = reader.decode(bmp, decodeHints);
} catch (NotFoundException e) {
e.printStackTrace();
} catch (ChecksumException e) {
e.printStackTrace();
} catch (FormatException e) {
e.printStackTrace();
}
System.out.println(result.getBarcodeFormat());
System.out.println("Text " + result.getText());
System.out
.println("-------------------------------------------------------");
} else {
System.out.println("No Buffered Image for "
+ files[i].getName());
}
}
}
current version of code:
public static void main(final String[] args) {
BufferedImage bfi = null;
File[] files = new File(DIR).listFiles();
int counttiffs = 0;
String filename = null;
TreeMap<String, Exception> errormap = new TreeMap<String, Exception>();
int onebarcode = 0;
int twobarcodes = 0;
int threebarcodes = 0;
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
try (BufferedInputStream bfin = new BufferedInputStream(
new FileInputStream(files[i]))) {
filename = files[i].getName();
bfi = ImageIO.read(bfin);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (bfi != null) {
LuminanceSource ls = new BufferedImageLuminanceSource(bfi);
BinaryBitmap bmp = new BinaryBitmap(new HybridBinarizer(ls));
Reader reader = new MultiFormatReader();
GenericMultipleBarcodeReader greader = new GenericMultipleBarcodeReader(
reader);
Result[] result = null;
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
try {
result = greader.decodeMultiple(bmp, decodeHints);
} catch (NotFoundException e) {
errormap.put(filename, e);
} catch (NullPointerException e) {
errormap.put(filename, e);
}
if (result != null) {
switch (result.length) {
case 1:
onebarcode++;
break;
case 3:
threebarcodes++;
break;
default:
twobarcodes++;
}
try (BufferedWriter bfwr = new BufferedWriter(
new FileWriter(FILE, true))) {
bfwr.write(filename + ": number of barcodes found = "
+ result.length);
bfwr.newLine();
for (int j = 0; j < result.length; j++) {
bfwr.write(result[j].getText());
}
bfwr.newLine();
bfwr.write("---------------------------------------------------------");
bfwr.newLine();
counttiffs++;
} catch (IOException e) {
e.printStackTrace();
}
}
}
else {
System.out.println("No Buffered Image for "
+ files[i].getName());
}
}
}
根据您的经验，当条形码不笔直且边缘有小错误时，zxing有多明智？pixles没有完美打印？这看起来就像一个bug，我在中修复了它。您可以通过抓取3.1.1-SNAPSHOT来尝试修复吗？NPE听起来像个bug。你能澄清一下你正在使用的代码的哪个版本吗？也就是说，你编译的代码中的第163行是什么？我无法访问它。该方法被自动调用为GenericMultipleBarcodeReader。您至少不知道代码的哪个版本？您是指zxing的哪个版本？应该是最新的。我三周前就下载了它。嗯，不是100%确定，但在pom上写着：com.google.zxing-zxing-parent 3.1.1-SNAPSHOT-pom。我不是已经有3.1.1-Snapshot了吗？或者您正在谈论另一个包？是的，这意味着您正在引用最新的快照。当然，在我进行修复之前，您不会得到我的修复，但是现在我已经提交了修复并发布了一个新快照，您应该得到更新。你可能需要强迫Maven用-U选项检查它啊，对不起，我没有看到你现在就写了修复程序！我会试试看，然后再打给你。也许明天吧！太多了！完全一样？我认为不可能。这条线上再也没有解引用了。有点不同吗？或者，我认为你没有更新。你可以通过删除~/.m2/repository/com/google/zxing/来确保你没有本地缓存的工件。对，这是同一问题的另一个实例。我想就这些了。我刚刚又推了一张快照。
for (int i = 0; i < files.length; i++) {
try (BufferedInputStream bfin = new BufferedInputStream(
new FileInputStream(files[i]))) {
dateiname = files[i].getName();
bfi = ImageIO.read(bfin);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (bfi != null) {
LuminanceSource ls = new BufferedImageLuminanceSource(bfi);
BinaryBitmap bmp = new BinaryBitmap(new HybridBinarizer(ls));
Reader reader = new MultiFormatReader();
GenericMultipleBarcodeReader greader = new GenericMultipleBarcodeReader(
new ByQuadrantReader(reader));
Result[] result = null;
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
try {
result = greader.decodeMultiple(bmp, decodeHints);
} catch (NotFoundException e) {
e.printStackTrace();
System.out.println("No result");
System.out.println("+++++++++++++++++++++++++++++++");
}
if (result != null) {
for (int j = 0; j < result.length; j++) {
System.out.println(result[j].getText());
System.out.println("+++++++++++++++++++++++++++++++");
}
}
} else {
System.out.println("No Buffered Image for "
+ files[i].getName());
}
}
Exception in thread "main" java.lang.NullPointerException
at com.google.zxing.multi.GenericMultipleBarcodeReader.doDecodeMultiple(GenericMultipleBarcodeReader.java:109)
at com.google.zxing.multi.GenericMultipleBarcodeReader.doDecodeMultiple(GenericMultipleBarcodeReader.java:148)
at com.google.zxing.multi.GenericMultipleBarcodeReader.decodeMultiple(GenericMultipleBarcodeReader.java:65)
at barcode.ZXingTestMulti.main(ZXingTestMulti.java:86)
current version of code:
public static void main(final String[] args) {
BufferedImage bfi = null;
File[] files = new File(DIR).listFiles();
int counttiffs = 0;
String filename = null;
TreeMap<String, Exception> errormap = new TreeMap<String, Exception>();
int onebarcode = 0;
int twobarcodes = 0;
int threebarcodes = 0;
for (int i = 0; i < files.length; i++) {
if (files[i].isFile()) {
try (BufferedInputStream bfin = new BufferedInputStream(
new FileInputStream(files[i]))) {
filename = files[i].getName();
bfi = ImageIO.read(bfin);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (bfi != null) {
LuminanceSource ls = new BufferedImageLuminanceSource(bfi);
BinaryBitmap bmp = new BinaryBitmap(new HybridBinarizer(ls));
Reader reader = new MultiFormatReader();
GenericMultipleBarcodeReader greader = new GenericMultipleBarcodeReader(
reader);
Result[] result = null;
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
try {
result = greader.decodeMultiple(bmp, decodeHints);
} catch (NotFoundException e) {
errormap.put(filename, e);
} catch (NullPointerException e) {
errormap.put(filename, e);
}
if (result != null) {
switch (result.length) {
case 1:
onebarcode++;
break;
case 3:
threebarcodes++;
break;
default:
twobarcodes++;
}
try (BufferedWriter bfwr = new BufferedWriter(
new FileWriter(FILE, true))) {
bfwr.write(filename + ": number of barcodes found = "
+ result.length);
bfwr.newLine();
for (int j = 0; j < result.length; j++) {
bfwr.write(result[j].getText());
}
bfwr.newLine();
bfwr.write("---------------------------------------------------------");
bfwr.newLine();
counttiffs++;
} catch (IOException e) {
e.printStackTrace();
}
}
}
else {
System.out.println("No Buffered Image for "
+ files[i].getName());
}
}
}
java.lang.NullPointerException
at com.google.zxing.multi.GenericMultipleBarcodeReader.translateResultPoints(GenericMultipleBarcodeReader.java:163)
at com.google.zxing.multi.GenericMultipleBarcodeReader.doDecodeMultiple(GenericMultipleBarcodeReader.java:96)
at com.google.zxing.multi.GenericMultipleBarcodeReader.doDecodeMultiple(GenericMultipleBarcodeReader.java:148)
at com.google.zxing.multi.GenericMultipleBarcodeReader.decodeMultiple(GenericMultipleBarcodeReader.java:65)
at zBarcodes_Test.ZXingTestMulti.main(ZXingTestMulti.java:72)