[boost] Re: boost::filesystem in Windows 95

From: Robert Mathews (rmathews_at_[hidden])
Date: 2005-03-15 17:22:10

Well ... except that it doesn't give the same information without at least
some work, because of a quirk about root directories. For example, calling
FindFirstFile with a UNC path like \\computer\share as input fails. There is
a note in the Win32 docs about this. Apparently you'd need to call it with
\\computer\share\* . So, at a minimum if you called FindFirstFile instead of
GetFileAttributesA, you'd need to append a '*' at the end of it first.

Rob.

"Jorge Lodos" <lodos_at_[hidden]> wrote in message
news:20050315185100.52ABC12953_at_Panther.segurmatica.com...
> Hi
>
> We have a code base for Windows that compiles with common settings for all
> Windows platforms. When using boost::filesystem, this is no longer
possible,
> due to the fact that Windows implementation in
operations_posix_windows.cpp
> uses the API function GetFileAttributesExA, not available in Windows 95.
>
> GetFileAttributesExA could be replaced by FindFirstFile, which gives the
> same information and is available in all Windows platforms.
>
> This API is used in two different places, BOOST_FILESYSTEM_DECL bool
> _is_empty( const path & ph ) implementation and BOOST_FILESYSTEM_DECL
> boost::intmax_t file_size( const path & ph ) implementation. Using
> FindFirstFile instead of  GetFileAttributesExA we would get:
>
>
>
>     BOOST_FILESYSTEM_DECL bool _is_empty( const path & ph )
>
>     {
>
> #   ifdef BOOST_POSIX
>
>
>
> ........
>
>
>
> #   else
>
>
>
>     WIN32_FIND_DATA ;
>
>     HANDLE hf = ::FindFirstFileA(ph.string().c_str(), &ffd);
>
>     if (hf == INVALID_HANDLE_VALUE)
>
>         boost::throw_exception( filesystem_error(
>
>           "boost::filesystem::is_empty",
>
>           ph, fs::detail::system_error_code() ) );
>
>     CloseHandle(hf);
>
>     return ( ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
>
>       ? is_empty_directory( ph )
>
>       :( !ffd.nFileSizeHigh && !ffd.nFileSizeLow );
>
>
>
> #   endif
>
>     }
>
>
>
>
>
>     BOOST_FILESYSTEM_DECL boost::intmax_t file_size( const path & ph )
>
>     {
>
> #   ifdef BOOST_POSIX
>
>
>
> .......
>
>
>
> #   else
>
>       // by now, intmax_t is 64-bits on all Windows compilers
>
>       WIN32_FIND_DATA ;
>
>       HANDLE hf = ::FindFirstFileA(ph.string().c_str(), &ffd);
>
>       if (hf == INVALID_HANDLE_VALUE)
>
>         boost::throw_exception( filesystem_error(
>
>           "boost::filesystem::file_size",
>
>           ph, fs::detail::system_error_code() ) );
>
>      CloseHandle(hf);
>
>      if ( (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) !=0 )
>
>         boost::throw_exception( filesystem_error(
>
>           "boost::filesystem::file_size",
>
>           ph, "invalid: is a directory",
>
>           is_directory_error ) );
>
>       return (static_cast<boost::intmax_t>(ffd.nFileSizeHigh)
>
>           << (sizeof(ffd.nFileSizeLow)*8))
>
>         + ffd.nFileSizeLow;
>
> #   endif
>
>     }
>
>
>
> Is there any chance this could be solved in boost::filesystem?
>
> Thank you for boost :-)
>
>
>
> Best regards
>
> Jorge
>
>
>
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