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Escape sequence in java

Hi,
  I have a problem in executing a command which takes parameters in double quotes. Seems like the following program is ignoring the double quotes, can any body help how this can be done in Java, I used to do these things in C using escape sequece (\" \").

String s = "";
s = new String ("/myfiles/command " + "-P");
Process p = Runtime.getRuntime.exec(s);

is getting executed on the command line as /myfiles/command -P instead of /myfiles/command "-P".

I tried "\"-P\"" and many combination like this unsucessfully.

thanks
Aravind
0
arvindhp
Asked:
arvindhp
1 Solution
 
sdussingerCommented:
It appears that the Java Runtime class parses the string you pass in and breaks on whitespace no matter what you do.

A solution to this would be:

String [] argVector = {"/myfiles/command", "-P"}
Process p = Runtime.exec (argVector);

This way, any arguments which you normally would have put into quotes will still be treated as a single argument, rather than multiple arguments split on whitespace.

HTH

--Steve
0
 
sdussingerCommented:
It appears that the Java Runtime class parses the string you pass in and breaks on whitespace no matter what you do.

A solution to this would be:

String [] argVector = {"/myfiles/command", "-P"}
Process p = Runtime.exec (argVector);

This way, any arguments which you normally would have put into quotes will still be treated as a single argument, rather than multiple arguments split on whitespace.

HTH

--Steve
0
 
eattrigCommented:
How were you using the \" character in conjunction with String?  Can you submit what you have tried?  I have tried instantiating String with "/myfiles/command \"-P\"" and outputing the String to the console and come back with /myfiles/command "-P", just like you wanted.
0
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sdussingerCommented:
eattrig:

I tried a whole bunch of different ways to do this, just like arvindhp did. I also wrote a little C program which simply counted its args and displayed the results.

Whenever I tried to handle a quoted string using Runtime.exec(String), it failed to create the arguments correctly. If the quoted arg does not contain spaces, then it works as you expect. However, if the quoted arg does contain spaces, the Runtime.exec (String) method breaks the quoted string at the spaces.

As near as I can tell, the issue here isn't in the String class. That works just fine. You can easily create a string with embedded quotes, no problem. The problem comes in when you try to pass that string to the Runtime.exec(String) method.


--Steve
0
 
kotanCommented:
Try this

String [] argVector = {"/myfiles/command", "\"-P\""}
Process p = Runtime.exec (argVector);
0
 
hanumansettiCommented:
Try this,

String s = "";
s = new String ("/myfiles/command " + "\"-P\"");


If u give System.out.println(s);

Output:
=======

/myfiles/command "-P"

0
 
daittCommented:
I think it's "/myfiles/command \\\"-P\\\"" :)
Regards
Dai
0
 
arvindhpAuthor Commented:
Hi,
  this answer is OK, but when I compile this I am getting the following error, can any one help how to proceed.
--------------------------------------------
argVector.java:571: Can't make static reference to method java.lang.Process exec(java.lang.String) in class java.lang.Runtime. Process p = Runtime.exec(argVector);
----------------------------------------------------
0
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