Re: Executing diff.exe with System call

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 05 Sep 2009 21:43:46 -0400

Message-ID:

<h7v44i$elk$3@news.albasani.net>

Lew wrote:

Hakan wrote:

I want to call the Windows version of the GNUDiff utilities from a
Java application with a call to the Runtime routines. I downloaded and
installed it and wrote the code that seemed to be right. This is the
equivalence of what I have for a call trying to compare two files
redirecting outout to a file.

String[] args=new String[5];
args[0]=C:\HL\GnuWin32\bin\diff.exe;
args[1]=C:\HL\eclipse\workspace\JIAS\getdeck.txt; (file 1)
args[2]=C:\HL\eclipse\workspace\JIAS\ddeck.txt; (file 2)
args[3]=">";
args[4]="diffres.txt" (output file)

try
{
Runtime.getRuntime().exec(args):
}
catch(IOException e)
{

}

Yet nothing happens. It compiles and runs, but the output file is
nowhere to be found. Where have I gone wrong?

Second by not looking in the right directory for "diffres.txt". It will
go in the classpath because you haven't told it otherwise, probably in
the same directory as the .class file as the class you claim "compiles
and runs".

I don't believe that the redirect operator works the way you are calling
"diff". I'm not familiar with using Runtime, but I think you might have to
call the shell to call "diff" for it to recognize redirection.

--
Lew