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Re: [libxml++] SIGABRT received during xmlpp::Document::write_to_string_formatted

The Glib::convert seems ok. It effectively throws a Glib::ConvertError exception, but you did not catch it in your test case.
According to the Glib::ustring documentation, I have to use ustring::raw() with operator <<(). It effectively works fine.
I made some slight modifications of my program, and I do not have the SIGABRT anymore. Now I've got an exception in Glib::ustring Glib::ustring xmlpp::Document::do_write_to_string( 
    const Glib::ustring& encoding,
    bool format)

In this function if I replace
	Glib::ustring result((char*)buffer, length);
by
      	Glib::ustring result((char*)buffer);

no more exception is raised...

And in xmlencode.cpp I can then output my raw data by
std::cerr << result_xml.raw() << std::endl;
Is there a reason to use Glib::ustring result((char*)buffer, length) instead of Glib::ustring result((char*)buffer) ? 


Murray Cumming a écrit :

This seems to be a problem with Glib::convert() (and the conversion
function that you were using before).

You see this earlier when you store the result of Glib::convert in a
ustring instead of a std::string (which makes sense, because it's a utf8
string.).

Glib::ustring's operator<< then throws an exception when trying to
convert the utf8 back into something that std::cerr can take. Using
g_warning() shows some ??s, suggesting that Glib::convert() was not
successful. I don't know whether the conversion should be successful.
You can see this in the attached version of the test case. 
But I would expect Glib::convert to throw a Glib::ConvertError
exception, as documented here:
http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/group__CharsetConv.html#ga2

So please file a glibmm bug report about that at bugzilla.gnome.org.
It's probably an issue in glib, but we'll hopefully track that down.

You might play with Glib::convert_with_fallback() for now.


On Tue, 2005-01-11 at 23:47 +0100, Cyril PICARD wrote:
For for the link, it's quite simpler now... but still SIGABRT... Still no idea on my side... 

Here is my code and the 'gdb info st' output:

*** code
#include <libxml++/libxml++.h>

#include <glibmm/convert.h>
#include <string>
#include <iostream>

int main(int argc, char **argv)
{
  xmlpp::Document doc;
  xmlpp::Element * elem = 0;
  std::string my_encoding = "ISO-8859-1";
  doc.set_internal_subset("GEDCOM", "", "gedcom60.dtd");
  doc.add_comment("Generated by libgedcomparser - part of GHOSTS project");
  elem = doc.create_root_node("GEDCOM");
  std::string converted = Glib::convert("blah éo", "UTF-8", my_encoding);
  elem->set_child_text(converted);
  std::cerr << converted << std::endl;

  doc.write_to_file_formatted("xmlencode.xml", my_encoding);
  std::cerr << "write_to_file_formatted OK" << std::endl;
  Glib::ustring result_xml;
  result_xml = doc.write_to_string_formatted(my_encoding);
  std::cerr << "write_to_string_formatted OK" << std::endl;
  std::cerr << result_xml << std::endl;
  return 0;
}

*** gdb info st:
Program received signal SIGABRT, Aborted.
[Switching to Thread 1024 (LWP 15825)]
0x403aa621 in kill () from /lib/libc.so.6
Current language:  auto; currently c
(gdb) info st
#0  0x403aa621 in kill () from /lib/libc.so.6
#1  0x4017826b in raise (sig=6) at signals.c:65
#2  0x403aba53 in abort () from /lib/libc.so.6
#3  0x402f7895 in __cxxabiv1::__terminate(void (*)()) ()
   from /usr/lib/libstdc++.so.3
#4  0x402f7880 in __cxxabiv1::__terminate(void (*)()) ()
   from /usr/lib/libstdc++.so.3
#5  0x402f79e0 in __cxa_rethrow () from /usr/lib/libstdc++.so.3
#6  0x402ede29 in std::__throw_length_error(char const*) ()
   from /usr/lib/libstdc++.so.3
#7 0x0804af61 in std::string::_Rep::_S_create(unsigned, std::allocator<char> co 
nst&) (__capacity=4294967295, __alloc= 0xbffff4c0)
    at /usr/include/g++-v3/bits/basic_string.tcc:371
#8 0x0804ab98 in char* std::string::_S_construct<char const*>(char const*, char 
 const*, std::allocator<char> const&, std::forward_iterator_tag) (
__beg=0x806e168 "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM \"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOS 
TS project-->\n<GEDCOM>blah éo</GEDCOM>\n", __end=0x806e167 "",
    __a= 0xbffff4c0) at /usr/include/g++-v3/bits/basic_string.tcc:143
#9 0x40034674 in std::string::string(char const*, unsigned, std::allocator<char 
> const&) (this=0xbffff520,
__s=0x806e168 "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n<!DOCTYPE GE DCOM SYSTEM \"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS 
---Type <return> to continue, or q <return> to quit---
 project-->\n<GEDCOM>blah éo</GEDCOM>\n", __n=4294967295, __a= 0xbffff4c0)
    at /usr/include/g++-v3/bits/basic_string.h:666
#10 0x401c40c4 in Glib::ustring::ustring(char const*, unsigned) (
    this=0xbffff520,
src=0x806e168 "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n<!DOCTYPE GE DCOM SYSTEM \"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS 
 project-->\n<GEDCOM>blah éo</GEDCOM>\n", n=170)
    at /usr/include/g++-v3/bits/stl_alloc.h:571
#11 0x40025d27 in xmlpp::Document::do_write_to_string(Glib::ustring const&, bool 
) (this=0xbffff6a0, encoding= 0xbffff5a0, format=true) at document.cc:309
#12 0x400259b8 in xmlpp::Document::write_to_string_formatted(Glib::ustring const 
&) (this=0xbffff6a0, encoding= 0xbffff5a0) at document.cc:266
#13 0x0804a318 in main (argc=1, argv=0xbffff734) at xmlencode.cpp:25
#14 0x40398280 in __libc_start_main () from /lib/libc.so.6

Murray Cumming wrote:


On Tue, 2005-01-11 at 20:59 +0100, Cyril PICARD wrote:
I understand your comments, but I don't understand how to correctly UTF-8-encode my string. I thought my conversion was ok since 
- I use the ConvertInput function provided in the libxml2 code samples



You might have more success with the Glib::convert() methods:
http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/group__CharsetConv.html





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------------------------------------------------------------------------

#include <libxml++/libxml++.h>

#include <glibmm/convert.h>
#include <string>
#include <iostream>
#include <glibmm.h> //For g_warning()

int main(int argc, char **argv)
{
 try
 {
   xmlpp::Document doc;
   xmlpp::Element * elem = 0;
   std::string my_encoding = "ISO-8859-1";
   doc.set_internal_subset("GEDCOM", "", "gedcom60.dtd");
   doc.add_comment("Generated by libgedcomparser - part of GHOSTS project");
   elem = doc.create_root_node("GEDCOM");

   Glib::ustring converted = Glib::convert("blah éo", "UTF-8", my_encoding);

   //std::cerr doesn't understand utf8, but g_warning() probably does:
   g_warning("converted=%s", converted.c_str());

   elem->set_child_text(converted);
//This throws a "Invalid byte sequence in conversion input" Glib::Error exception 
   std::cerr << converted << std::endl;


   doc.write_to_file_formatted("xmlencode.xml", my_encoding);
   std::cerr << "write_to_file_formatted OK" << std::endl;


   Glib::ustring result_xml;

   //This throws an exception:
   result_xml = doc.write_to_string_formatted(my_encoding);

   std::cerr << "write_to_string_formatted OK" << std::endl;
   std::cerr << result_xml << std::endl;
 }
 catch(const xmlpp::exception& ex)
 {
   std::cerr << "xmlpp::exception: " << ex.what() << std::endl;
   return 0;
 }
 catch(const Glib::Error& ex)
 {
   std::cerr << "Glib::Error exception: " << ex.what() << std::endl;
   return 0;
 }
 catch(const std::exception& ex)
 {
   std::cerr << "std::exception: " << ex.what() << std::endl;
   return 0;
 }
}
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