[xml] Read&Write Files with unicode/UTF-16 names (on Windows) (was: RE: Read tree from FILE* ?)

[Trappel Martin <martin trappel ksengineers at>]

> I wrote:
> Any Windows users out there who'd share (some example code) 
> how they get around the windows-filenames issue?

Well, after looking at xmlReadIO(..) and also looking at
xmlRegisterInputCallbacks(..) I've decided to skip all that and just use
xmlReadMemory(..) and xmlDocDumpFormatMemoryEnc(..) and read/write the files
myself to a character buffer.
This works OK, since I'm only using the tree API at the moment.

Still, allow me to phrase two questions:
* Is there an opposite to xmlReadIO, something like xmlWriteIO ?
* Is anyone using the xmlRegisterInputCallbacks(..) to open files with wide
character names? (It seems to me this would require some additional
wrapping, since the callback functions get char* for the file URL. So I'd
first had to encode the wchar_t filename to utf8 and the, in the callback,
decode it again.)


best regards / mit freundlichen Grüßen,
Martin Trappel


> -----Original Message-----
> From: Trappel Martin [mailto:martin trappel ksengineers at] 
> Sent: Monday, April 23, 2007 9:17 AM
> To: veillard redhat com
> Cc: xml gnome org
> Subject: Re: [xml] Read tree from FILE* ?
>
> > -----Original Message-----
> > From: Daniel Veillard [mailto:veillard redhat com]
> > Sent: Sunday, April 22, 2007 9:56 PM
> > To: Trappel Martin
> > Cc: xml gnome org
> > Subject: Re: [xml] Read tree from FILE* ?
> >
> > On Fri, Apr 20, 2007 at 11:32:18AM +0200, Trappel Martin wrote:
> > > Hello!
> > >
> > > I successfully can use xmlDocFormatDump(FILE*, xmlDocPtr,
> > int) to save
> > > my xml document tree to a file.
> > >
> > > However, I seem unable to find out how to _read_ a document
> > tree from
> > > a FILE*.
> > > Is there an opposite funtion to xmlDocDump?
> > >
> > > (The reason why I want to use FILE* is that I'm on windows and 
> > > therefore my filenames are UTF-16 which I can't give to 
> libxml. If 
> > > there is another solution to this problem than via 
> opening the file 
> > > myself I would also take that one. :)
> >
> >   And if your program and libxml2 happen to have been compiled with 
> > even slightly different flags, the library and your program will 
> > expect different version of FILE * structure and this will 
> crash and 
> > burn. This is such a problem that basically I avoid this in API.
> >   You can certainly create what you need based on
> >     http://xmlsoft.org/html/libxml-parser.html#xmlReadIO
>
> Thanks for the pointer. Will certainly look into this.
> (And, yes, already had a crach with FILE* ... That's why I recompiled
> libxml2 to use the same lib as our app ... But you're 
> probablby right when you say one is better of not depending 
> on this api :)
>
>
> Any Windows users out there who'd share (some example code) 
> how they get around the windows-filenames issue?
>
>
> Cheers,
> Martin
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