File I/O

[Robert L Hamilton]

method Boilerplate(input_data) static signals IOException,InterruptedException;

/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/   
/*         B O I L E R P L A T E            */
/* Identifies program source  et c.         */
/*                                          */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

say "input data were . . . . . " input_data ;

parse source Name MethClass Source ;

say Name ';  ' MethClass '; ' Source '  . . .From parse source in BP , , ,  ';

cmd = 'cmd /c dir "C:\\program files" ' 

say 'the command is . . . . .  ' cmd;

r = Runtime.getRuntime()
p = r.exec(cmd)

class StreamFiler extends Thread
     is=InputStream
     filename=String
 
    
--34567890123456789012345678901234567890123456789    
    method StreamFiler(is2=InputStream, outputfilename=String)        --        constructor method
        is = is2
       
 
    method run() public        --    a method that runs when the Thread object is started
       outputfilename='C:\\out_file.txt'               --     outputfilename
            do
            br = BufferedReader(InputStreamReader(is))    --    create an object to read an output stream
           
           
            outfile = BufferedWriter(FileWriter(outputfilename))    --     create an object to write data to a file
            line=String null
            line = br.readLine        --    read the first line
            loop while line \= null
--                System.out.println(type ">" line)
                outfile.write(line,0,line.length)    --    write input line to output file
                outfile.newLine                      --    advance file to next line
                line = br.readLine                   --    read a new input line
                end
            outfile.close        --    close the file when done
            catch ioe=IOException        --        intercept any io errors and print a trace
                ioe.printStackTrace()
         end


The code above compiles and runs but does not produce an output file.

BobH

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[rvjansen]

Hi Bob,

several things: as it is now, it needs a

    method main(args=String[]) static

to start running if you invoke it by the class name that is given by
your source filename. The Boilerplate method is not called
automatically. You will not need it, as the main method is called
automatically on startup. It will provide the first argument to the
program in args[0] - which can be used instead of your input_data.

If I have some time tonight I will try to make it run with the thread
reading the stream - if no one beats me to it.

best regards,

René

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[Marc Remes]

Runtime.getRuntime().exec needs an array.

In your (Windows) case :

execArray[0] = 'cmd.exe"
execArray[1] = "/c"
execArray[2] = 'dir "C:\\program files"'

I use the following method :

  method rxExecArray(execArray = String[]) private

    do
       p = Runtime.getRuntime().exec(execArray)

       in = BufferedReader(InputStreamReader(p.getInputStream()))
       linenum = 0
       Loop forever
          line = in.readLine
          if line = null then leave
          linenum = linenum + 1
          rxStdout[linenum] = line
       End
       rxStdout['0'] = linenum

       in = BufferedReader(InputStreamReader(p.getErrorStream()))
       linenum = 0
       Loop forever
          line = in.readLine
          if line = null then leave
          linenum = linenum + 1
          rxStderr[linenum] = line
       End
       rxStderr['0'] = linenum

       p.waitFor()
       rxRc = p.exitValue()
       p.getInputStream().close()
       p.getErrorStream().close()
       p.getOutputStream().close()

    catch InterruptedException
       rxStdout['0'] = 0
       rxStderr['0'] = 0
       rxRc = -9

    catch IOException
       rxStdout['0'] = 0
       rxStderr['0'] = 0
       rxRc = -9
    end

    return rxRc



Best regards

Marc Remes

IBM Certified IT Specialist
IBM Global Technology Services
Mobile: [phone]
mailto:mremes@...

Robert Hamilton <[hidden email]>
Sent by: [hidden email]

11/10/2010 08:11 PM

Please respond to
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Subject	[Ibm-netrexx] File I/O

method Boilerplate(input_data) static signals IOException,InterruptedException;

/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/   
/*         B O I L E R P L A T E            */
/* Identifies program source  et c.         */
/*                                          */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

say "input data were . . . . . " input_data ;

parse source Name MethClass Source ;

say Name ';  ' MethClass '; ' Source '  . . .From parse source in BP , , ,  ';

cmd = 'cmd /c dir "C:\\program files" ' 

say 'the command is . . . . .  ' cmd;

r = Runtime.getRuntime()
p = r.exec(cmd)

class StreamFiler extends Thread
     is=InputStream
     filename=String
 
    
--34567890123456789012345678901234567890123456789    
    method StreamFiler(is2=InputStream, outputfilename=String)        --        constructor method
        is = is2
       
 
    method run() public        --    a method that runs when the Thread object is started
       outputfilename='C:\\out_file.txt'               --     outputfilename
            do
            br = BufferedReader(InputStreamReader(is))    --    create an object to read an output stream
           
           
            outfile = BufferedWriter(FileWriter(outputfilename))    --     create an object to write data to a file
            line=String null
            line = br.readLine        --    read the first line
            loop while line \= null
--                System.out.println(type ">" line)
                outfile.write(line,0,line.length)    --    write input line to output file
                outfile.newLine                      --    advance file to next line
                line = br.readLine                   --    read a new input line
                end
            outfile.close        --    close the file when done
            catch ioe=IOException        --        intercept any io errors and print a trace
                ioe.printStackTrace()
         end


The code above compiles and runs but does not produce an output file.

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[alansam]

On 10 November 2010 12:53, Marc Remes <[hidden email]> wrote:

Runtime.getRuntime().exec needs an array.

In your (Windows) case :

execArray[0] = 'cmd.exe"
execArray[1] = "/c"
execArray[2] = 'dir "C:\\program files"'

While an interesting exercise in itself, I fail to see why you take a system neutral environment like the JVM and make it system dependent by using operating system commands.  The whole point of the Java world is to make programs "write once, debug everywhere" not "write for this platform, then rewrite for the next platform, then..."

The java.io.File class provides a perfectly system independent way of listing the contents of a directory (http://download.oracle.com/javase/1.5.0/docs/api/java/io/File.html#list%28%29) that does the job without jumping through hoops and creating a separate runtime environment.  e.g:

fn = File('C:/Program Files')
ff = fn.list()
loop ix = 0 to ff.length - 1
  say ff[ix]
end ix

The same class also provides all kinds of information about File objects, like file type, size, attributes etc.

If you're looking for an alternative to Windows Batch then Java based languages are a very bad choice: horses for courses...

Alan.
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[Tom Maynard]

On 11/10/2010 4:28 PM, Alan Sampson wrote:

fn = File('C:/Program Files')
ff = fn.list()
loop ix = 0 to ff.length - 1
  say ff[ix]
end ix

This code also requires a preliminary "import java.io.File" ... but otherwise serves as an excellent example.

Tom.

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[alansam]

On 10 November 2010 15:01, Tom Maynard <[hidden email]> wrote:

On 11/10/2010 4:28 PM, Alan Sampson wrote:

fn = File('C:/Program Files')
ff = fn.list()
loop ix = 0 to ff.length - 1
  say ff[ix]
end ix

This code also requires a preliminary "import java.io.File" ... but otherwise serves as an excellent example.

Tom.

Really?  Didn't for me...

A.

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[Kermit Kiser]

Bob ;

That code does not look quite like what you shared before. Did you accidentally omit the part that calls your method? As René pointed out, there is not much point in defining classes and methods if no code accesses them. NetRexx will create a basic class and "main" method so Java can start your program but you have to do the rest.

Your method is also missing the code that creates the stream handler threads and starts them. Below is a modified version of your code that will work. (Note - using "source"for both input and output variable in parse seems to break the NetRexx interpreter.)

The system command you execute may write to both the standard output and the error output streams in general. If either one fills it's output buffer, the whole command will hang. That is why you need separate threads to read each stream.

As Alan pointed out, although this code is valid for issuing system commands in general, using it this way to issue a "dir" command limits your program to only run on Windows systems. There are Java class library methods that are easier to use for getting directory and file information and they work on Unix or Mac systems as well as Windows systems.


-- Kermit

-----------------------------------------------------------------------------------------------------------------------------------

Boilerplate(arg)

method Boilerplate(input_data) static signals IOException,InterruptedException;

/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/  
/*         B O I L E R P L A T E            */
/* Identifies program source  et c.         */
/*                                          */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

say "input data were . . . . . " input_data ;

parse source Name MethClass fileSource

say Name ';  ' MethClass '; ' fileSource '  . . .From parse source in BP , , ,  ';

cmd = 'cmd /c dir "C:\\program files" '

say 'the command is . . . . .  ' cmd;

r = Runtime.getRuntime()
p = r.exec(cmd)
          
errorGobbler = StreamGobbler(p.getErrorStream(), "ERROR")   -- any error message?    
outputFiler = StreamFiler(p.getInputStream(), 'filename-is-ignored-now')     -- any output?
errorGobbler.start()                                        -- kick them off
outputFiler.start()

class StreamFiler extends Thread
     is=InputStream
     filename=String
 
    method StreamFiler(is2=InputStream, outputfilename=String)        --        constructor method
        is = is2
 
    method run() public        --    a method that runs when the Thread object is started
       outputfilename='C:\\out_file.txt'               --     outputfilename
            do
            br = BufferedReader(InputStreamReader(is))    --    create an object to read an output stream
          
          
            outfile = BufferedWriter(FileWriter(outputfilename))    --     create an object to write data to a file
            line=String null
            line = br.readLine        --    read the first line
            loop while line \= null
--                System.out.println(type ">" line)
                outfile.write(line,0,line.length)    --    write input line to output file
                outfile.newLine                      --    advance file to next line
                line = br.readLine                   --    read a new input line
                end
            outfile.close        --    close the file when done
            catch ioe=IOException        --        intercept any io errors and print a trace
                ioe.printStackTrace()
         end
    
class StreamGobbler extends Thread
     is=InputStream
     type=String
  
    method StreamGobbler(is2=InputStream, type2=String)
        is = is2
        type = type2
  
    method run() public
        do
            br = BufferedReader(InputStreamReader(is))
            line=String null
            line = br.readLine
            loop while line \= null
                System.out.println(type ">" line)
                line = br.readLine
                end
            catch ioe=IOException
                ioe.printStackTrace()
            end


-----------------------------------------------------------------------------------------------------------------------------------


On 11/10/2010 11:11 AM, Robert Hamilton wrote:

method Boilerplate(input_data) static signals IOException,InterruptedException;

/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/   
/*         B O I L E R P L A T E            */
/* Identifies program source  et c.         */
/*                                          */
/* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/

say "input data were . . . . . " input_data ;

parse source Name MethClass Source ;

say Name ';  ' MethClass '; ' Source '  . . .From parse source in BP , , ,  ';

cmd = 'cmd /c dir "C:\\program files" ' 

say 'the command is . . . . .  ' cmd;

r = Runtime.getRuntime()
p = r.exec(cmd)

class StreamFiler extends Thread
     is=InputStream
     filename=String
 
    
--34567890123456789012345678901234567890123456789    
    method StreamFiler(is2=InputStream, outputfilename=String)        --        constructor method
        is = is2
       
 
    method run() public        --    a method that runs when the Thread object is started
       outputfilename='C:\\out_file.txt'               --     outputfilename
            do
            br = BufferedReader(InputStreamReader(is))    --    create an object to read an output stream
           
           
            outfile = BufferedWriter(FileWriter(outputfilename))    --     create an object to write data to a file
            line=String null
            line = br.readLine        --    read the first line
            loop while line \= null
--                System.out.println(type ">" line)
                outfile.write(line,0,line.length)    --    write input line to output file
                outfile.newLine                      --    advance file to next line
                line = br.readLine                   --    read a new input line
                end
            outfile.close        --    close the file when done
            catch ioe=IOException        --        intercept any io errors and print a trace
                ioe.printStackTrace()
         end


The code above compiles and runs but does not produce an output file.

BobH

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[Robert L Hamilton]

Works on DELL laptop Windoze XP SP3

bobh

On Wed, Nov 10, 2010 at 5:01 PM, Tom Maynard <[hidden email]> wrote:

On 11/10/2010 4:28 PM, Alan Sampson wrote:

fn = File('C:/Program Files')
ff = fn.list()
loop ix = 0 to ff.length - 1
  say ff[ix]
end ix

This code also requires a preliminary "import java.io.File" ... but otherwise serves as an excellent example.

Tom.

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[Tom Maynard]

On 11/11/2010 11:14 AM, Robert Hamilton wrote:

Works on DELL laptop Windoze XP SP3

I withdraw my earlier proviso.  The code compiles and runs just fine exactly as in the original post.  I must have been hallucinating.  (It happens.)

Tom

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[Thomas.Schneider.Wien]

Hello Tom Maynard:

Relating Halluniciaton:

Do you know, what exacltly will happen on the 21.12.2012 ??

*NOT* the end of our living.
*NOT* the Apokalypse.

What is (will be) really happening on this day is:

Our well beloved SUN is appreaching the *middle* of our *local Universe*, exactly on this day.

Therefore, our SUN will produce a LOT of protuberances.

This will, in fact, influence life on this earth very dramatically:

1.) We will see so called POLAR-LIGHT (usually only in the SUMMER in FINLAND and SWEDEN) *all araound of the Earth)

2.) Most probably, on *our Earth*, we will have one day where all:

    a) Handy's won't work
    b) GPS Systems won't work
    c) Satellite Systems won't work

3.) Thus, we would simply see out Earth surrounded by POLAR Lights.
Very fascinating, you will see.

4.) The old Mayas, as you do (hopefully) know, did predict this Day in their calendar as day Number 13.0.0.0.0

5.) Actually, the SUN is in this position (in the middle of the milky-way) only all
26.000 years (exactly speaking, only all 25.800 years quoting the current
rotation time of the (our) earth ...

Now, my question, dear *informatic people*

6.) Wherefrom did the Mayas in their famous calender get this knowledge from ???

Thomas Schneider.
=============================================================
 
Niverse
a
Am 11.11.2010 19:53, schrieb Tom Maynard:

On 11/11/2010 11:14 AM, Robert Hamilton wrote:

Works on DELL laptop Windoze XP SP3

I withdraw my earlier proviso.  The code compiles and runs just fine exactly as in the original post.  I must have been hallucinating.  (It happens.)

Tom

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[rvjansen]

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

best regards,

René

On Fri, Nov 12, 2010 at 4:44 PM, Thomas Schneider <[hidden email]> wrote:

> Hello Tom Maynard:
>
> Relating Halluniciaton:
>
> Do you know, what exacltly will happen on the 21.12.2012 ??
>
> *NOT* the end of our living.
> *NOT* the Apokalypse.
>
> What is (will be) really happening on this day is:
>
> Our well beloved SUN is appreaching the *middle* of our *local Universe*,
> exactly on this day.
>
> Therefore, our SUN will produce a LOT of protuberances.
>
> This will, in fact, influence life on this earth very dramatically:
>
> 1.) We will see so called POLAR-LIGHT (usually only in the SUMMER in FINLAND
> and SWEDEN) *all araound of the Earth)
>
> 2.) Most probably, on *our Earth*, we will have one day where all:
>
>     a) Handy's won't work
>     b) GPS Systems won't work
>     c) Satellite Systems won't work
>
> 3.) Thus, we would simply see out Earth surrounded by POLAR Lights.
> Very fascinating, you will see.
>
> 4.) The old Mayas, as you do (hopefully) know, did predict this Day in their
> calendar as day Number 13.0.0.0.0
>
> 5.) Actually, the SUN is in this position (in the middle of the milky-way)
> only all
> 26.000 years (exactly speaking, only all 25.800 years quoting the current
> rotation time of the (our) earth ...
>
> Now, my question, dear *informatic people*
>
> 6.) Wherefrom did the Mayas in their famous calender get this knowledge from
> ???
>
> Thomas Schneider.
> =============================================================
>
> Niverse
> a
> Am 11.11.2010 19:53, schrieb Tom Maynard:
>
> On 11/11/2010 11:14 AM, Robert Hamilton wrote:
>
> Works on DELL laptop Windoze XP SP3
>
> I withdraw my earlier proviso.  The code compiles and runs just fine exactly
> as in the original post.  I must have been hallucinating.  (It happens.)
>
> Tom
>
> _______________________________________________
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>
>
>
> --
> Thomas Schneider Projects ReyC & LOGOS on www.KENAI.com
> _______________________________________________
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>
>
>

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[alansam]

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
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[Thomas.Schneider.Wien]

Hi Alan, *and all* :

1.) Do *not* know, whether the Mayas did have Rexx :-(
2.) They *must have had*, as thery did have an 11, 12, *and* 13 arithmetic (at the same time) :-) :-) :-)
 3.) they therefore have been able to calculate soooo many things, for instance,

*The Day* 13.0.0.0  0 (Maya Notation)

   -- which is --

*By instance*, *by default*, **or** by *eternity:

The 21.12.2012 (Austrian Notation), which is denoted 21/12/2012 *or*
12/21/2012     -- guess why  :-) :-) :-)  -- and guess where :-) :-) :-)

So What !

Isn't it time ??
For what ?

Thomas Schneider.
=============================================================
Am 12.11.2010 17:47, schrieb Alan Sampson:

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
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[Thomas.Schneider.Wien]

Hi Alan
   I'm working as you:

*by brain*
*using my fingers*

Thomas Schneider.
==============================================================
Am 12.11.2010 17:47, schrieb Alan Sampson:

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
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[Fernando Cassia-2]

On Fri, Nov 12, 2010 at 12:44 PM, Thomas Schneider <[hidden email]> wrote:
> Our well beloved SUN is appreaching the *middle* of our *local Universe*,
> exactly on this day.

The only SUN I worshipped was *SUN* Microsystems. Sadly the *Sun* is
gone, but luckily I can see on the *ORACLE* that a lot of its *STARS*
will continue SHINING ON, thanks to open source (ie OpenJDK,
Netbeans,Glassfish, Virtualbox, etc ).

With kind regards,
FC
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[George Hovey-2]

Wasn't it Incas that used knots?

On Fri, Nov 12, 2010 at 11:47 AM, Alan Sampson <[hidden email]> wrote:

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
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[alansam]

On 12 November 2010 10:20, George Hovey <[hidden email]> wrote:

Wasn't it Incas that used knots?

Ancient mariners, I thought :-)

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[Thomas.Schneider.Wien]

Both Inca's and Mayas did use knot's to count things:


1,2,3,4,5,6,7,8,9

Interestingly, the Mayas had their own notation for mathmatics:

'I'   did mean FIVE
'II'  did mean TEN
'III' did mean FIFTEEN
... and 'IIII' did mean TWENTY.

Hence, they did simply denote *one hand* by a *I*.
                                                     *two hands* by a *II*

They didn't have a DECIMAL *based* system therefore, but a system based on FIVE, and differences/additions to five, denoted by *dots*

DOT. DOT DOT, DOT DOT DOT, DOT DOT DOT, *FIVE*

The *DOTS* have been written vertically, interestingly.

Probably to +save space+ ...

Thomas Schneider. .

===============================================================

Am 12.11.2010 19:20, schrieb George Hovey:

Wasn't it Incas that used knots?

On Fri, Nov 12, 2010 at 11:47 AM, Alan Sampson <[hidden email]> wrote:

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
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[Thomas.Schneider.Wien]

Hello George again,

2 question:

1.) what *is the difference* between a *D*OT and a *KN*OT
2.) *and* , what they do have common ?

HINT: Do read them from right to left  :-) :-) :-)

Thomas.
=============================================================

Am 12.11.2010 19:20, schrieb George Hovey:

Wasn't it Incas that used knots?

On Fri, Nov 12, 2010 at 11:47 AM, Alan Sampson <[hidden email]> wrote:

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
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I will need your help, please.

I am sending you a message in varios languages:

... --- ...

:I  ::=::  II  ::: :-) :-) :-)

Dai mi busho, moi milacik, jeden,  dwa, tri, djakujem, doswidania
Dai mi bushi, moi kochanie, rast, dwa, dzi, dcickuja, dowicenia.

Give me a kiss, my darling, one, two, three, bye, bye

Gib mir ein Bussi, mein Liebling, eins, zwei, drei;
Auf WiederSchaun!
==========================================================
Capisci ???

===============================================
Am 12.11.2010 19:37, schrieb Thomas Schneider:

Both Inca's and Mayas did use knot's to count things:


1,2,3,4,5,6,7,8,9

Interestingly, the Mayas had their own notation for mathmatics:

'I'   did mean FIVE
'II'  did mean TEN
'III' did mean FIFTEEN
... and 'IIII' did mean TWENTY.

Hence, they did simply denote *one hand* by a *I*.
                                                     *two hands* by a *II*

They didn't have a DECIMAL *based* system therefore, but a system based on FIVE, and differences/additions to five, denoted by *dots*

DOT. DOT DOT, DOT DOT DOT, DOT DOT DOT, *FIVE*

The *DOTS* have been written vertically, interestingly.

Probably to +save space+ ...

Thomas Schneider. .

===============================================================

Am 12.11.2010 19:20, schrieb George Hovey:

Wasn't it Incas that used knots?

On Fri, Nov 12, 2010 at 11:47 AM, Alan Sampson <[hidden email]> wrote:

On 12 November 2010 08:07, René Jansen <[hidden email]> wrote:

Hi Tom,

that is fascinating to know. I hope the Mayas had some rope with knots
that encoded some early form of Rexx and did not bother with curly
braces in any way. But may we try to stay on-topic?

Rope?  Knots?  Now I'm interested...  Do they work in the JVM?  Do tell...

A.
--
Can't tweet, won't tweet!

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Ibm-netrexx mailing list
[hidden email]

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