Runtime.exec()

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3 total messages Started by Christoph Sperle Tue, 02 Nov 1999 00:00

#408

Author: Christoph Sperle
Date: Tue, 02 Nov 1999 00:00

34 lines
1382 bytes

Hi,

I have a Problem with the exec-Method of the Runtime-Object. On the
DOS-Commandline this statement works propperly:

command.com /c copy C:\print.ps lpt1

but with the exec-Method it doesen't. Here is my Programm:


import java.io.*;

public class doscommand {

    public static void main (String[]args){

        int i;
        InputStream is;

        try{
            is = Runtime.getRuntime().exec("command.com /c copy C:\\print.ps
lpt1").getInputStream();
            while((i = is.read()) != -1) System.out.print((char)i);
        }
        catch(java.io.IOException e) {
            System.err.println(e.getMessage());
            System.exit(1);
    }
}


Why is this? Can anyone help me?

Thank you, christoph.

Re: Runtime.exec()

#409

Author: geoff_robinson
Date: Tue, 02 Nov 1999 00:00

51 lines
1888 bytes

Try breaking this apart so you can do a little debugging.

Process p = r.exec(command);
p.waitFor();

see if it works, then do the Input Stream stuff.

Geoff


In article <7vmjmm$s23$1@n.ruf.uni-freiburg.de>,
  "Christoph Sperle" <sperle@wi.ba-loerrach.de> wrote:
> Hi,
>
> I have a Problem with the exec-Method of the Runtime-Object. On the
> DOS-Commandline this statement works propperly:
>
> command.com /c copy C:\print.ps lpt1
>
> but with the exec-Method it doesen't. Here is my Programm:
>
> import java.io.*;
>
> public class doscommand {
>
>     public static void main (String[]args){
>
>         int i;
>         InputStream is;
>
>         try{
>             is = Runtime.getRuntime().exec("command.com /c copy
C:\\print.ps
> lpt1").getInputStream();
>             while((i = is.read()) != -1) System.out.print((char)i);
>         }
>         catch(java.io.IOException e) {
>             System.err.println(e.getMessage());
>             System.exit(1);
>     }
> }
>
> Why is this? Can anyone help me?
>
> Thank you, christoph.
>
>


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Re: Runtime.exec()

#410

Author: Mohan Shenoy
Date: Wed, 03 Nov 1999 00:00

6 lines
754 bytes

What is the error message?

--
Mohan Shenoy
Email: shenoym@vsnl.com
http://personal.vsnl.com/mohans

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