libxmlplusplus-general

[libxml++] Re: Problems using libxml++

[Christophe de V. <cde...@al...>]

Hi,

Bastian_Pfennigschmidt/CODESCO/DE...@co... wrote:

>
> Hello,
>
> I've tried to read and write an XML file using your great library - 
> but I'm running into some problems,
> it would be very nice, if you could give me some code snippets.
>

Did you have a look to the examples ? If you think something important 
is missing in it, just tell us.

> Here are my problems:
>
> 1. When I create an XML using write_to_string or write_to_file and 
> there are special characters, like
> German umlauts, they are not converted into entities. The XML file is 
> UTF-8 encoded.
>
> mXMLParser->get_document()->write_to_string("UTF-8");
>
> When I try to parse the output, I got a parsing error, because the 
> special characters are not valid in UTF-8.
>

Don't forget that in-memory libxml++ encoding is supposed to be UTF-8. 
Any call to a function of the API is waiting for UTF-8 encoded strings. 
So if you gave it ISO-xxx encoded string with special characters this 
probably led to your problem.

>
> And my second problem:
>
> I'm using write_to_file_formatted to get a formated file. If I use 
> write_to_file I get a document with only to lines.
> But if I parse this formatted file again and write it back to file, 
> the formatting are gone (see my attachment).
>

The formatting was gone with write_to_file_formatted ? Or did you use 
write_to_file the second time ?

>
>
> Many thanks for your help
>

Your welcome.

BTW please use the mailing list next time you need help.


Cheers,

Christophe

[libxml++] Re: Problems using libxml++

[Christophe de V. <cde...@al...>]

Bastian_Pfennigschmidt/CODESCO/DE...@co... wrote:

> Encoding problem: I thought that the libxml encodes all special 
> characters to entities if I write it to xml, but it seems to be that
> I'm responsible to do that - ok!
>

Yes you are. The easier is to use iconv (which I personnaly wrap into a 
c++ class, making it even easier to use).

> Formatting problem:
>
> Yes, I'm using write_to_file_formatted every time, it's the same with 
> write_to_string_formatted, the formatting was gone after
> parsing and writing the second time.
>

I cannot reproduce this. Please provide an example.
What version of libxml++ and libxml2 do you use ?


Christophe

[libxml++] Re: Problems using libxml++

[Christophe de V. <cde...@al...>]

Hi

In the code you sent I see only calls to write_to_string, no 
write_to_string_formatted at all. So understanding the formatting 
problem is a bit difficult :-)
It would be better if you could reproduce the problem in a small 
program, possibly based on dom_read_write example.

Regards,

Christophe

Bastian_Pfennigschmidt/CODESCO/DE...@co... wrote:

>
> Here's my class in which I use the libxml++
> Have a look at XMLInit and XMLDeinit
>
> I've updated to the newest available versions of libxml++ and libxml2.
>
> It's compiled as stdcall 2Byte - because of the application in which I 
> use
> the libxml++
> There are no problems with the libxml++ or libxml2 except this 
> formatting problem.
>

[libxml++] Re: Problems using libxml++

[Christophe de V. <cde...@al...>]

Bastian_Pfennigschmidt/CODESCO/DE...@co... wrote:

> <snip>
>
> If I compile the dom_read_write example the output looks fine, even 
> when I use
> write_to_file instead of write_to_file_formatted.
>

It's because formatting is done by inserting whitespaces that are kept 
as text nodes when parsing. So writing it again keep the formatting.

>
> Something get wrong - maybe there are some conflicts with my other 
> libraries.


Do you have other parts of your program using libxml2 without libxml++ ? 
Normaly it shouldn't alterate the behavior of libxml++ with formatting 
but we never know : some settings for formatting are global one and I 
could have missed one when saving the context before the effective writing.
When you lose the formatting of the output, is everything on a single 
line or two, or is it just messed up ?

> So, I think there is no way to get a clean formatted xml output with 
> my project settings.
>
>
> Thanks for help 


Your welcome


Christophe

[libxml++] Re: Problems using libxml++

[Christophe de V. <cde...@al...>]

Bastian_Pfennigschmidt/CODESCO/DE...@co... wrote:

>
> My application is a kind of plugin for another program, its linked as 
> a dll.
> I have to link against six other libraries.
> In my code I only use the libxml++.
>
>
> If I use write_to_string without formatting I got the output in two 
> lines, the first with the xml tag <?xml ... ?>
> and the rest of the file as a singe line in the second line of the file.
>
> xmlDocument.write_to_file("without_formatting.xml", "UTF-8");
> xmlDocument.write_to_file_formatted("with_formatting.xml, "UTF-8");
>
> (see attachments)
>
>
> Now the formatting is right in with_formatting.xml, but if I parsed it 
> again and save it, you got a document
> like the one I've attached to my second mail.
>

Strange. It looks a bit like if you modified the tree and saved it with 
write_to_file : some formatting whitespaces are still there, some other 
not at all.

Let me know if you solve the problem and what was the reason.

Regards,

Christophe