RE: [xml] Problem with basic libxml functions

[Sagar Rastogi <rastogi students iiit net>]

Hello.. both of u were perfectly right. I was assuming that the 
white-spaces in the xml file will be ignored. Thanks a lot.

Sagar

On Mon, 22 Mar 2004, Jesse Pelton wrote:

> You need to understand how XML handles whitespace; see
> http://www.w3.org/TR/2004/REC-xml-20040204/.  The text node to which Bill is
> referring is the whitespace (newline + space characters) that you've used to
> format your document. 
>
> <terminal_preference>
> </terminal_preference>
>
> is not equivalent to
>
> <terminal_preference></terminal_preference>
>
> or
>
> <terminal_preference/>
>
> unless you provide a DTD the indicates the whitespace should be ignored.
>
> I imagine the code you've snipped assumes child_of_cur points to a list of
> children, but text node have no children.
>
> > -----Original Message-----
> > From: William M. Brack [mailto:wbrack mmm com hk] 
> > Sent: Sunday, March 21, 2004 6:15 AM
> > To: Sagar Rastogi
> > Cc: xml gnome org
> > Subject: Re: [xml] Problem with basic libxml functions
> >
> >
> > Sagar Rastogi said:
> > > Hi
> > Hi Sagar
> >
> > >        I am working on an enhancement to make the panel-run-dialog
> > > "smart", i.e. it should be able to remember whether the user wanted
> > > to run
> > > a command in terminal or not. So next time the user runs the same
> > > command,
> > > his preference is remembered. (Bug no. 77300).
> > >   I am storing the data in an xml file in the foll. format
> > >
> > > <?xml version="1.0"?>
> > > <terminal_preference>
> > >         <command>
> > >                 <name> Program name like "galeon" or "nautilus"
> > > </name>
> > >                 <terminal> true or false </terminal>
> > >         </command>
> > >         <command>
> > >                 ...
> > >         </command>
> > > </terminal_preference>
> > >
> > > I am using libxml functions to parse/write to the xml file. I have
> > > used
> > > them exactly in the way specified in examples. Foll is a code
> > > extract:
> > >
> > > <snip>
> > >
> > >   //cur points to root node at the start.
> > >   cur = cur->xmlChildrenNode;
> > >         printf("Reaches here 3.2 \n");  //This gets printed
> > >         //cur points to command
> > >         while(cur) {
> > >                 printf("Reaches here 3.3 \n"); //This gets printed
> > >                 child_of_cur = cur->xmlChildrenNode;
> > >
> > > <snip>
> >
> > Ah, a most unfortunate spot to "snip"... I can see what you have
> > done with the variable "child_of_cur", but I have absolutely no way
> > to tell what you do in the following lines with it or with the
> > variable "cur".  Certainly the cause of your "crash" is not on these
> > specific lines of code, but probably somewhere later in the loop.
> >
> > > The contents of my xml file are:
> > >
> > > <?xml version="1.0"?>
> > > <terminal_preference>
> > > </terminal_preference>
> > >
> > >   As is obvious from the code extract, the control enters 
> > the while
> > > loop
> > > when it shouldn't. The program crashes at the line:
> >
> > Hmmm... well, it's not obvious to *me* why it shouldn't enter the
> > while loop.  Your element <terminal_preference> looks to me like it
> > has text content which will be a child node, so I would expect it to
> > enter the loop.
> >
> > >  child_of_cur = cur->xmlChildrenNode
> > >   Could somebody please tell me what is the error here?
> > >
> > > Regards
> > > Sagar Rastogi
> >
> > I heartily recommend to you that you learn to use the gdb debugger,
> > and step through your code.  That should help you to see where you
> > are going wrong.
> >
> > Bill
> >
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