Re: [libxml++] parser problem

[dexter <de...@ba...>]

Hi!

First of all, I think you slightly misunderstood what i wrote.

1. I'm aware of that I don't have DTD in my xml. I have a very good 
reason for that. Namely, I don't need it. I'll do the validation with a 
schema and not with DTD. (I also know that libxml++ doesn't contain a 
wrapper to do that, but i've already applied Emilien KIA's patch, so now 
it is capable to do validation with schemas)

2. The problem is not with the validation (It does not even get there).
The problem is that the xml is _not_ well formed. And what I would like 
is to get the error somehow in my program, but instead it just writes 
error messages to the console. Of course I use exceptions as you wrote, 
and I catch everything at the end [catch (...)], but this error cannot 
be catched because - as i noticed - it doesn't raise an exception.

With the method I mentioned in my previous mail, I'm able to catch those 
error, but I thougth - maybe - there's a simplier way to do that.

I hope it's more clear now.

--
Balazs

> ----- Original Message -----
> From: Glück Attila Béla <glu...@gm...>
> To: lib...@li...
> Sent: Wed, Jan 30, 2008 8:04:56 AM +0100
> Subject: [libxml++] parser problem
> 
> Hi Balazs!
> 
> First: You don't have DTD in your xml. libxml++ can read it from your
> xml, or from an another file:
> <?xml version="1.0"?>
> <!DOCTYPE settings SYSTEM "myxml.dtd">
> You can't validate your xml with the DomParser without a correct DTD.
> 
> Second: You need catch the exceptions. 
> Something like this:
> try {
>     conf->load_general_settings("general.xml");
> } catch (xmlpp::internal_error& ex) {
>     Gtk::MessageDialog dlg(_("Internal error in the xml
> parser!"),false, Gtk::MESSAGE_ERROR,Gtk::BUTTONS_OK);
>     dlg.set_secondary_text(ex.what()); dlg.run();
>     return -1;
> } catch (xmlpp::validity_error& ex) {
> ...
> } catch (xmlpp::exception& ex) {
>     Gtk::MessageDialog dlg(_("Error in the xml parser!"),false,
>                            Gtk::MESSAGE_ERROR,Gtk::BUTTONS_OK);
>     dlg.set_secondary_text(ex.what());
>     dlg.run();
>     return -1;
> }
> 
> In this program I should not work with the bad xml, but sometimes 
> it possible. In this case you need only a try-catch block in 
> your code at the read, and it will work fine. But don't forget send a 
> message to the user. Much easier to correct the bug in the xml, if 
> you know, it is there.
> If you have problem with the validation, you can switch it of, 
> and force the reading.
> Something like this:
> 
> void read_from_xml(const char* file, bool validation=true)
> {
>   xmlpp::DomParser parser;
>   parser.set_validate(validation);
>   parser.parse_file(file);
> ..
> }
> 
> try {
>   read_from_xml("myxml.xml");
> } catch (xmlpp::validity_error& ex) {
>   log.add_warning("myxml validation failed!");
>   read_from_xml("myxml.xml",false);
> }
> 
> Attila
> 
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