RE: Some java some perl
I did this question in here because I was aspecting that I was not the first
crazy man doing something like this. I'm a perl programmer not a java
programmer.
I know that I'll have problems calling one from the other like this.
Probabli the final release will be a Server/Client application to avoid this
issue and give me the fridum to have interfaces in diferent machines in
diferent countries, but for now I would be glade to have it simple.
What I give was a test script, in the real world the script takes 15 minutes
to 3 hours at least to run.
I tryed to do the interface with perlTK and the results was not very OS
like.
I would be hapy if someone can help me.
I need to run something like: perl -e 'print "ola\n" foreach (1..100)'.
Thanks
Marcos
-Original Message-
From: R. Joseph Newton [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 11, 2004 3:48 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: Some java some perl
[EMAIL PROTECTED] wrote:
> I'm doing one interface in java that will call some perl scripts. I need
to
> catch the output and I don't know how to do it.
>
> If I execute the 'ls' command my java program finnish if I call the perl
my
> program don't finnish. What am I missing?
What are you expecting from your call to Perl? Note that shelling out has
the
same dangers with Java as with Perl.
>
>
> import java.io.DataInputStream;
> import java.io.IOException;
>
> public class Test {
> public static void main(String[] args) {
> try {
> Runtime r = Runtime.getRuntime();
>
> String[] aStr = {"-e", "'print(\"Ola\n\") foreach
(1..100);'"};
>
> Process p = r.exec("perl", aStr);
You told the system to open the perl compiler here. You may also have
Offered
it 100 lines like this:
"Ola
""Ola
Which Perl would have a very hard time interpreting as code.
>
> //Process p = r.exec("ls");
>
> DataInputStream strm = new
DataInputStream(p.getInputStream());
>
> String str;
> while ((str = strm.readLine()) != null){
> System.out.println(str);
> }
> } catch (IOException e) {
> e.printStackTrace();
> }
> }
> }
>
> Thanks
> Marcos
The code above is straight Java. Although it does inicdentally call the
Perl
interpreter, it is not presented with any further directions, and therefore
does
nothing. It is probably not the right place to discuss the Java
Runtime::exec
function. That would be more appropriate on a Java list [use Google to find
one] For what it is worth, perl is generally called with a script name or
code
as the first parameter..
Please learn how to use each language well on its own before you try to
develop
cross-platform programs.
Joseph
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RE: Some java some perl
Hello Joseph,
>> String[] aStr = {"-e", "'print(\"Ola\n\") foreach
(1..100);'"};
>>
>> Process p = r.exec("perl", aStr);
>
> You told the system to open the perl compiler here. You may also have
Offered
> it 100 lines like this:
> "Ola
> ""Ola
> Which Perl would have a very hard time interpreting as code.
[...]
> For what it is worth, perl is generally called with a script name or code
> as the first parameter..
I think you misread. The above calls the following :
perl -e 'print("Ola\n") foreach (1..100);'
which is a valid invocation of perl.
I have no useful information to add, since I do not know why the OP's
program doesn't work. It's been a long time since I've done Java... And I do
agree this is probably not the right place to post this, because the perl
runs well, so the problem is the Java. Still, I thought I'd set the records
straight.
J-S
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Re: Some java some perl
[EMAIL PROTECTED] wrote:
> I'm doing one interface in java that will call some perl scripts. I need to
> catch the output and I don't know how to do it.
>
> If I execute the 'ls' command my java program finnish if I call the perl my
> program don't finnish. What am I missing?
What are you expecting from your call to Perl? Note that shelling out has the
same dangers with Java as with Perl.
>
>
> import java.io.DataInputStream;
> import java.io.IOException;
>
> public class Test {
> public static void main(String[] args) {
> try {
> Runtime r = Runtime.getRuntime();
>
> String[] aStr = {"-e", "'print(\"Ola\n\") foreach (1..100);'"};
>
> Process p = r.exec("perl", aStr);
You told the system to open the perl compiler here. You may also have Offered
it 100 lines like this:
"Ola
""Ola
Which Perl would have a very hard time interpreting as code.
>
> //Process p = r.exec("ls");
>
> DataInputStream strm = new DataInputStream(p.getInputStream());
>
> String str;
> while ((str = strm.readLine()) != null){
> System.out.println(str);
> }
> } catch (IOException e) {
> e.printStackTrace();
> }
> }
> }
>
> Thanks
> Marcos
The code above is straight Java. Although it does inicdentally call the Perl
interpreter, it is not presented with any further directions, and therefore does
nothing. It is probably not the right place to discuss the Java Runtime::exec
function. That would be more appropriate on a Java list [use Google to find
one] For what it is worth, perl is generally called with a script name or code
as the first parameter..
Please learn how to use each language well on its own before you try to develop
cross-platform programs.
Joseph
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
Some java some perl
I'm doing one interface in java that will call some perl scripts. I need to
catch the output and I don't know how to do it.
If I execute the 'ls' command my java program finnish if I call the perl my
program don't finnish. What am I missing?
import java.io.DataInputStream;
import java.io.IOException;
public class Test {
public static void main(String[] args) {
try {
Runtime r = Runtime.getRuntime();
String[] aStr = {"-e", "'print(\"Ola\n\") foreach (1..100);'"};
Process p = r.exec("perl", aStr);
//Process p = r.exec("ls");
DataInputStream strm = new DataInputStream(p.getInputStream());
String str;
while ((str = strm.readLine()) != null){
System.out.println(str);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Thanks
Marcos
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