Re: [xml] Problem with xmlReadFile on Windows and 0x10 characters

[Nikolay Sivov <bunglehead gmail com>]

On 6/23/2010 16:41, James Ytterstene wrote:
> Hello
>
> Im writing a c++ wrapper where i read a XML file with the 
> xmlReadFile("filename", NULL, 0);
> I have created the file via libxml2 calls and got it saved to disk.
>
> The file im trying to read in my example is:
> --------------------------------------------------------------------
> <?xml version="1.0" encoding="UTF-8"?>
> <config>
> <configuration name="testSaveLoadXMLFileLayout">
> <parameter name="floatParam1" datatype="float">92345.1</parameter>
> </configuration>
> </config>
>
> Now my problem:
> -----------------------------
> If i have the file unchanged from any windows editor the line ending 
> is CR only but
> if someone edit the file it will be changed to CRLF (Stupid windows 
> editors but we must use them)
> If i now try to read the file back in libxml2 i will get an extra node 
> at each line only containing 0x10. Blanks on the new line seems to be 
> cleared ok.
> If i change the xmlReadFile and add the option XML_PARSE_NOBLANKS i 
> can read the file back ok. But when reading about that option i find
> many posts about not to use it, so im confused here.
Hi, James.

We're using this option in Wine for ms-like xml processing wrapper. So 
it's used for both CR/CRLF files, cause some files bundled with app 
could have a CRLF formatting. And I have to say that there's no problem 
with it, and no bugs reported for open/parsing that could be affected by 
this, AFAIK.

If I remember correctly compliant parser shouldn't care about return 
codes inside markups, and text/CDATA/comments should be processed as is 
in file.
> When i read about libxml2 and how files should be parsed i get the 
> feeling that the parser should handle the CRLF when reading files and 
> always
> save the new files with CR only. So the extra CRLF shouIdn't be any 
> issue but I can be wrong here.
> Is there any general solution for the parsing of files so the CR CRLF 
> doesnt add any extra nodes?
Yes, saving is another story. In Wine to get more win-like output we 
have to mess with output stream and add line-feeds. So libxml2 doesn't 
provide a way to customize this thing (and it shouldn't actually, 
according to standards). If you need a properly formatted output you 
need to rewrite a node dumping yourself.
> /James