Hello,

I have code written using the basic fstream object on a Win32 system.  This
is of course simply a typedef for basic_fstream<char, char_traits<char> >.

This object can not be used to write or read files that are larger than 2Gb
in size, as it would appear (from looking at the iosfwd header) that the
underlying streamoff and streamsize types are typedef'd to long and int. On
Win64 systems, these are typedef'd to __int64, so it seems that on Win64
systems fstream can in fact be used to read and write large files.

However, is there a way I can define a new type and define a char_traits for
this type so that I can use basic_fstream to read and write large files on
Win32?  Looking into the std c++ iostream headers, it is not clear that this
is in fact doable, as many things seem to depend on these basic streamoff
and streamsize typedefs, which are not mutable in my own class.

I would like to know whether I am reading this correctly, or whether people
have had success in doing this, i.e. creating a char_traits type that when
used with basic_fstream will allow for large (>2Gb) file reading and
writing.

Thanks,

-Eric Twietmeyer

(MSDN no-spam alias: MSDNNospam170@nospam.nospam)