C and XML

Hi,

I understand that XML documents are usually parsed by applications at
run-time, and I wonder if it is possible to have the program change
its behavior based on updates to the XML document? I was told that the
C standard library doesn't provide the tools to do that. However, a C
program can use OS-specific functions which would allow it, and many
OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
such functions available on my OS, and if so, what are those?

Thank you.

Regards,
Rayne

lancer6238@gmail.com writes:

> Hi,
>
> I understand that XML documents are usually parsed by applications at
> run-time, and I wonder if it is possible to have the program change
> its behavior based on updates to the XML document? I was told that the
> C standard library doesn't provide the tools to do that. However, a C
> program can use OS-specific functions which would allow it, and many
> OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
> such functions available on my OS, and if so, what are those?

The functions that are available to you are the same function that are
available everywhere else. There are functions that let you open and read
files, or check the file's last modification timestamp.

It's all a matter of implementing a framework that checks if its XML
configuration file has changed, and if so reloads its contents.



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On 04/27/2009 08:14 PM, lancer6238@gmail.com wrote:
> Hi,
>
> I understand that XML documents are usually parsed by applications at
> run-time, and I wonder if it is possible to have the program change
> its behavior based on updates to the XML document? I was told that the
> C standard library doesn't provide the tools to do that. However, a C
> program can use OS-specific functions which would allow it, and many
> OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
> such functions available on my OS, and if so, what are those?
>
> Thank you.
>
> Regards,
> Rayne

Install the Redhat equivalent of Debian's libexpat1-dev. It's a library
that lets you read XML files from the C language.

lancer6238@gmail.com writes:

> Hi,
>
> I understand that XML documents are usually parsed by applications at
> run-time, and I wonder if it is possible to have the program change
> its behavior based on updates to the XML document? I was told that the
> C standard library doesn't provide the tools to do that. However, a C
> program can use OS-specific functions which would allow it, and many
> OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
> such functions available on my OS, and if so, what are those?

It's not native to the OS. You have to add it.
Pick a language, then search for XML support in that language.
Java, perl, etc.

On 04/28/2009 04:28 PM, Maxwell Lol wrote:
> lancer6238@gmail.com writes:
>
>> Hi,
>>
>> I understand that XML documents are usually parsed by applications at
>> run-time, and I wonder if it is possible to have the program change
>> its behavior based on updates to the XML document? I was told that the
>> C standard library doesn't provide the tools to do that. However, a C
>> program can use OS-specific functions which would allow it, and many
>> OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
>> such functions available on my OS, and if so, what are those?
>
> It's not native to the OS. You have to add it.

What do you mean add it, to the OS or what?

> Pick a language, then search for XML support in that language.
> Java, perl, etc.

Why pick a language? The OP is already asking/trying to accomplish XML
parsing in *C* language, What Java, Perl, etc has to do with the
original question?

Why not C? See http://expat.sourceforge.net/
and also C++ http://xerces.apache.org/xerces-c/

--
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Balwinder S Dheeman <bsd.SANSPAM@cto.homelinux.net> writes:

> On 04/28/2009 04:28 PM, Maxwell Lol wrote:
>> lancer6238@gmail.com writes:
>>
>>> Hi,
>>>
>>> I understand that XML documents are usually parsed by applications at
>>> run-time, and I wonder if it is possible to have the program change
>>> its behavior based on updates to the XML document? I was told that the
>>> C standard library doesn't provide the tools to do that. However, a C
>>> program can use OS-specific functions which would allow it, and many
>>> OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
>>> such functions available on my OS, and if so, what are those?
>>
>> It's not native to the OS. You have to add it.
>
> What do you mean add it, to the OS or what?

To your application.

>
>> Pick a language, then search for XML support in that language.
>> Java, perl, etc.
>
> Why pick a language? The OP is already asking/trying to accomplish XML
> parsing in *C* language, What Java, Perl, etc has to do with the
> original question?

He was saying that XML parsers exist for pretty much all languages.

>
> Why not C? See http://expat.sourceforge.net/
> and also C++ http://xerces.apache.org/xerces-c/

Using gnome? No problem.

http://www.xmlsoft.org/

--
In view of all the deadly computer viruses that have been spreading
lately, Weekend Update would like to remind you: when you link up to
another computer, you’re linking up to every computer that that
computer has ever linked up to. — Dennis Miller

Balwinder S Dheeman <bsd.SANSPAM@cto.homelinux.net> writes:

> On 04/28/2009 04:28 PM, Maxwell Lol wrote:
>> lancer6238@gmail.com writes:
>>
>>> Hi,
>>>
>>> I understand that XML documents are usually parsed by applications at
>>> run-time, and I wonder if it is possible to have the program change
>>> its behavior based on updates to the XML document? I was told that the
>>> C standard library doesn't provide the tools to do that. However, a C
>>> program can use OS-specific functions which would allow it, and many
>>> OSs have that capability. I'm using RedHat Enterprise Linux 5. Are
>>> such functions available on my OS, and if so, what are those?
>>
>> It's not native to the OS. You have to add it.
>
> What do you mean add it, to the OS or what?

The OS is everything: kernel, libraries, utilities, header files, etc.

I don;t thnk you need to modify the kernel.
>
>> Pick a language, then search for XML support in that language.
>> Java, perl, etc.
>
> Why pick a language? The OP is already asking/trying to accomplish XML
> parsing in *C* language, What Java, Perl, etc has to do with the
> original question?

I'm not sure he requires a C solution. I read it as an example language.


>
> Why not C? See http://expat.sourceforge.net/
> and also C++ http://xerces.apache.org/xerces-c/

C is fine as well. As I said, first pick a language..