Question

How redirect console output to my program?

Asked by: oraelbis

Hi.
I need execute some native function from dll. It's ok.
But this function results printed in console.
I need have access for these results for parsing and analysing from my java program.
Another problem. When I execute this function, I can see output results only when my java program terminated.

Thanks.

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Asked On
2004-07-01 at 04:45:16ID21044576
Tags

output

,

from

,

java

,

redirect

Topic

Java Programming Language

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Answers

 

by: girionisPosted on 2004-07-01 at 04:55:18ID: 11445617

How do you execute the native function? Is it through JNI or are you using the Runtime class?

 

by: oraelbisPosted on 2004-07-01 at 05:15:39ID: 11445780

I use JNI

 

by: girionisPosted on 2004-07-01 at 05:17:26ID: 11445792

Can you not get the i/o stream somehow? Or do you already get it and the data is displayed in the console?

 

by: oraelbisPosted on 2004-07-01 at 05:54:06ID: 11446095

I need get iinput stream for this data (redirect Ыныеуьющге to my input stream).
At carrent time I have results only in consele after my program terminated.

 

by: girionisPosted on 2004-07-01 at 06:26:44ID: 11446430

How does the output stream of the dll work? Can you not obtain it somehow and then read the data from Java?

 

by: oraelbisPosted on 2004-07-01 at 06:58:03ID: 11446748

> How does the output stream of the dll work? Can you not obtain it somehow and then read the data >from Java?
Yes. I cant get dll output from java.
And have not dll sorce code and specification. I dont know how dll function work.
This function return boolean result
result = FooFunction( some parameters);
and print some results on OS standart output (console).
I need read this results from my java program after function executed.

 

by: x4uPosted on 2004-07-01 at 06:58:48ID: 11446756

As a quick 'n dirty hack you could use dup2 at the C side to redirect the output to the input stream and then read it from System.in in Java.
dup2 (STDOUT_FILENO, STDIN_FILENO);

You'll need to include "unistd.h" and maybe "fcntl.h" as well (extern C if you use C++).
But this will also redirect everything written to System.out to System.in.

 

by: girionisPosted on 2004-07-01 at 07:04:52ID: 11446817

What I was going to suggest next was to dump output from DLL to a file and then read it from Java but if you don't have the source code then that's impossible.

Sorry I am stumped now :(

 

by: oraelbisPosted on 2004-07-01 at 07:25:20ID: 11446999

Ok. I' m not C++ programmer.
but how about writing new C++ dll wich will use Foo dll and create new C function.
Is it possible create something like:

InputStream result = FooFunction2( some parameters, oldresult);


 

by: girionisPosted on 2004-07-01 at 07:27:59ID: 11447021

Not sure... In other words you want to write a wrapper class. Maybe you can also ask a question to the C/C++ topic areas?

 

by: Giant2Posted on 2004-07-01 at 07:44:35ID: 11447214

>how about writing new C++ dll wich will use Foo dll and create new C function.
Sure, but you must manage all in the C code.
Giant.

 

by: orangehead911Posted on 2004-07-01 at 08:49:21ID: 11448021

I have done something like this, but it was over two years ago and I can't remember. If you can wait until tomorrow, I'll be happy to post some code. Otherwise, I would suggest having this question moved to the C or C++ TA.

 

by: oraelbisPosted on 2004-07-24 at 23:18:42ID: 11630857

Thank's all fo ideas

 

by: elrichalPosted on 2004-08-12 at 06:13:04ID: 11783405

Maybe you need to flush std* from the dll in order to keep actualised the output, other solution could be to comunicate it through a file. Do do this you can redirect the C std* lines to a file (as explained in support.microsoft.com/support/kb/articles/Q58/6/67.asp)

Good luck,

elrichal

20120131-EE-VQP-002

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