Generate a PDF471 Barcode from byte array in Java

Aspose.BarCode Product Family
1

I need to generate a PDF471 Barcode from a byte array and not from text.
How can this be done in Java?

There exists a solution in .NET:
https://forum.aspose.com/t/generate-a-pdf471-barcode-from-byte-array/229207

Unfortunately this does not work in Java.

The basic way does not function:

String content = new String(data.readAllBytes(), StandardCharsets.UTF_8);

This ends up with additional bytes, which will cause an exception in the BarcodeGenerator like
“Maximum characters limit reached for BINARY compaction mode and 2 error correction level.
Encoded data length - 1345. Max available length - 1102.” - Where the initial byte array length is 782 - largely below the limit…

Doing something like:
byte[] dataBA = data.readAllBytes();
char[] charEncoded = new char[dataBA.length];
for (int i = 0; i < dataBA.length; ++i)
{
charEncoded[i] = (char)dataBA[i];
}
String content = new String(charEncoded);

doesn’t help either. The “problem” seems to be in the constructor of String.

2

@ThoKoc,

Could you please share your complete (runnable) sample code that are using in Java to reproduce the exception, we will check it soon.

3

Hi,

J1PMH77HBfFOtaTc.png (8.16 KB)

AsposeJavaTest.zip (2.54 KB)

4

Concerning post above by Thomas_Koch:

From debugging see the difference when stopping at line 23:

see picture in upper mail post

The content string is blown up. Seems to be utf-16.
By consequence the content will be too big for data in normal use.
(of course: the hello world functions, as always…)

5

Thanks for the samples.

We have logged a ticket with an id “BARCODEJAVA-1334” for your issue/requirements. We will investigate and look into the details and try to sort it out.

Once we have an update on it, we will let you know here.

6

Additional information about the byte array:
The byte array contains 10 leading bytes with an identification number and a zip. Byte 10 and 11 have the value 80 and 75, makes PK which is the start marker for the zip.
The content of the zip is:
Hello world!

7

@ThoKoc,

Thanks for sharing the additional information.

I have logged it with your existing ticket. This may help to evaluate your issue thoroughly.

8

Changing the charset seems to solve the problem:

String content = new String(data.readAllBytes(), StandardCharsets.ISO_8859_1);

9

@ThoKoc,

Thanks for sharing the workaround and good to know that your issue is sorted out by changing the charset. Should we close the thread/ticket or you need us to continue to evaluate the issue?

10

The issue can be closed.

11
12

@ThoKoc,

I have closed the topic/thread for your needs now.