Re: [ZPT] How to write input to a file and run a perl script

2007-04-30 Thread Tino Wildenhain 

Charu ASTHANA schrieb:

Dear users,

I am fairly new to zope.  i am not much of a computer scientist but I 
can do some programming.

ok so here is my problem:

I have ot create a web page, which asks the user for some inputs and 
upload of a data file.
The input values and the file name (the uploaded file will be saved on 
the server) are to be written to a text file that will be saved on the 
server.
This text file will then be given as input to a perl program that will 
read and do some calculations.


Now I have reached so far:
I have created a web page which asks for user inputs.
Then when the user submits the form :
  a) I create another web page that shows the user what all he has 
inputted and ,
   b) also send the input ( thought he set parameter list) to a python 
script.


Now I am not able to understand ???
1) how to write all the set of parameter that python script has got onto 
a text file ( i do not clearly understand about the limitations of 
script in zope context)


Well what you edit via browser in Zope is called thru-the-web scripting
and is made as secure as possible. So you _dont_ have access to the
servers filesystem from there.

However, you have extfile and localfs as ready to install products
which enable limited filesystem access to create the objects there.

Still then you would have to find a way to call that external
script.

2) Also how do I call a perl script from this python script. ( i could 
not understand the concept of external methods)


External methods are created as python source files in the extensions
directory and contain at least one function. In these scripts you
can do everything python enables you to do, including filesystem access
and popen() for startig external tools.

Any pointers will be very helpful. Also any example of similar code will 
be beneficial.


There are a lot cerveats when it comes to such constructs. You can
easily enable big security holes to your system when you arent
very carefully. Thats why TTW-scripting is so isolated.

Btw, what exact type of some calculations does your perl
script do? I'd expect it easier to just rewrite it in
pure python.

Other approaches would be to provide the form in zope maybe
and then just direct the action to a cgi-bin which is or
calls your perl script (depending on its interface)

Regards
Tino
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Re: [ZPT] How to write input to a file and run a perl script

2007-04-30 Thread Charlie Clark 

Am 30.04.2007, 15:23 Uhr, schrieb Charu ASTHANA [EMAIL PROTECTED]:


Dear users,
 I am fairly new to zope.  i am not much of a computer scientist but I  
can do some programming.

ok so here is my problem:


 I have ot create a web page, which asks the user for some inputs and  
upload of a data file.


The input values and the file name (the uploaded file will be saved on  
the server) are to be written to a text file that will be saved on the  
server.


Why do you want to save to a file rather than the Zope database? If you  
need access to the file system you must use an ExternalMethod.


This text file will then be given as input to a perl program that will  
read and do some calculations.

 Now I have reached so far:



I have created a web page which asks for user inputs.



Then when the user submits the form :
  a) I create another web page that shows the user what all he has  
inputted and ,
   b) also send the input ( thought he set parameter list) to a python  
script.



 Now I am not able to understand ???


1) how to write all the set of parameter that python script has got onto  
a text file ( i do not clearly understand about the limitations of  
script in zope context)


Look at context.REQUEST.form in the PythonScript for the values. You  
cannot access the file system from within a PythonScript


2) Also how do I call a perl script from this python script. ( i could  
not understand the concept of external methods)


You cannot. How complex is the perl script? It might make sense to rewrite  
it in Python to be able to use it from within Zope otherwise you must use  
an ExternalMethod to invoke your perl script, pass it the data and get a  
response from it but would be fairly complicated.


 Any pointers will be very helpful. Also any example of similar code  
will be beneficial.


For what you want to do it seems strange to want to use Zope rather than  
using a Perl cgi script. If you are going to stick with the Zope then you  
should probably spend some time reading the Zope Book to understand what  
Zope is, how it works and what it lets you do.


Charlie
--
Charlie Clark
eGenix.com

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