[Boost-users] Problems with boost::filesystem::path

From: Johnson, Donald W MVK Contractor (Donald.W.Johnson_at_[hidden])
Date: 2005-04-26 11:41:37

Boost::filesystem::path is failing to create any paths. If always throws and
exception stating invalid path. In the main function I call 

        boost::filesystem::path::default_name_check(
boost::filesystem::native );
        boost::filesystem::initial_path();

The attempts to construct paths are in the pattern

        boost::filesystem::path(some_path_name);

Specificly the error occurs here in constructing a path

   void path::m_path_append( const std::string & src, name_check checker )
    {
      // convert backslash to forward slash if checker==native 
      // allow system-specific-root if checker==no_check || checker==native

      assert( checker );
      assert( src.size() == std::strlen( src.c_str() ) ); // no embedded 0

      if ( src.size() == 0 ) return;

      std::string::const_iterator itr( src.begin() );

      // [root-filesystem]
#     ifdef BOOST_WINDOWS
      if ( (checker == no_check || checker == native) && src.size() >= 2 )
// This fails       
        {
        ...

Since fore some reasion it seemed to be failing to get the native checker I
tired this instead

        boost::filesystem::path(some_path_name,boost::filesystem::native);

But the above test still fails.

This seems to be related to the filesystem code being used in the main
application and a DLL.

I added this line to boost/config/user.hpp

        #define BOOST_FILESYSTEM_DYN_LINK

So the library should be dynamicly linked and it being used in two places
shouldn't be a problem. If I trace the function in a debugger all calls to
the filesystem library look like this

	>
FESMLibDebug.dll!boost::filesystem::path::default_name_check(bool (const
std::basic_string<char,std::char_traits<char>,std::allocator<char> > &)*
new_check=0x004573e2) 

	>	FESMLibDebug.dll!boost::filesystem::path::m_path_append(const
std::basic_string<char,std::char_traits<char>,std::allocator<char> > &
src={...}, bool (const
std::basic_string<char,std::char_traits<char>,std::allocator<char> > &)*
checker=0x004573e2)

So it doesn't look like im getting 2 copies of boostfile system. I previously
was getting calls to 
$(APPNAME)!boost::filesystems and $(DLLNAME)!boost::filesystems.

        However, if I incluede the source files of the dll directly into the
application the problem dissapears. Anyone know what I missed? This is with
Visual C++ 2003 and Windows XP. 

Thanks 
Donald Johnson