Capturing stdout from C++ library

[obsidian]

I have a C++ library I am accessing using JNA. During operation it prints various pieces of information to the stdout, which I would like to be able to capture within Java. The prints appear on the output, so I assume that it should be possible to do this.

However, I have tried capturing the Java System.out, using System.setOut, and that does not seem to work. Does anybody know a way of capturing the stdout?

Thanks

[Wellton Barros]

Hello friend, you must in C ++ must return byte array, and receive as Java byte [].

I hope this helps!

Wellton S. Barros

www.cafecanudo.com.br

+55 62 9602-0305

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[Kustaa Nyholm]

On 17 Jun 2015, at 16:56, obsidian <stephe...@gmail.com> wrote:

> I have a C++ library I am accessing using JNA. During operation it prints various pieces of information to the stdout, which I would like to be able to capture within Java. The prints appear on the output, so I assume that it should be possible to do this.

This is not really a Java nor JNA question.

You need to figure out how to do that on the C/C++ side and you can then bring the data over to Java and this is where JNA can help.


How ever, if you are on Unix/Linux/Mac OS you could possibly just pipe the output to a socked and read that directly in Java…come to think of it, you can execute any program from Java directly and capture the output, this would be the easiest if can compile your C++ lib to an application that can be executed.

br Kusti


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[Timothy Wall]

Are you using a C or C++ library? manipulating stdout/stderr is different from cout/cerr.

You should look up how to redirect those streams first, then you will better understand how you can perform that manipulation from Java.

It *is* possible to redirect those streams to a file (which then would be easy to read from Java).

Note that Java’s System.out is entirely different from native code’s output buffers. The C or C++ runtimes have their own mechanisms for delivering text output to the terminal, and *that* is what you have to intercept.