Is there a way to define the sharing mode of a file w/ fstream?
If I make
fstream f("toto.txt");
I can''t open the file w/ another process before I close f.
Is there a way w/ Standart C++ (I now that the fstream MS specific can do this, but I want make it protable).
_______________
Jester, studient programmer
The Jester Home in French
Sharing file w/ fstream
The fstream constructor takes three parameters, but two of them have default values. To specify sharing mode, simply do the following:
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Thanks to Kylotan for the idea!
fstream f ( "filename.ext", ios::in|ios::out, filebuf::sh_read|filebuf::sh_write ); [ GDNet Start Here | GDNet Search Tool | GDNet FAQ ]
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Thanks to Kylotan for the idea!
Author
The problem is:
On VC++:
sh_read and sh_write are defined on fstream.h wich seems to be Microsoft specific (not in the std namespace) and independant of fstream.
The more near in the fstream header:
explicit basic_fstream(const char *_S, ios_base::openmode _M = in | out)
On Digital UNIX V4.0D w/ gcc 2.95:
No sh_read nor sh_write in the fstream.h.
The more affialte ctor i find is :
fstream(const char *name, int mode, int prot=0664);
Maybe that I miss some header?
_______________
Jester, studient programmer
The Jester Home in French
On VC++:
sh_read and sh_write are defined on fstream.h wich seems to be Microsoft specific (not in the std namespace) and independant of fstream.
The more near in the fstream header:
explicit basic_fstream(const char *_S, ios_base::openmode _M = in | out)
On Digital UNIX V4.0D w/ gcc 2.95:
No sh_read nor sh_write in the fstream.h.
The more affialte ctor i find is :
fstream(const char *name, int mode, int prot=0664);
Maybe that I miss some header?
_______________
Jester, studient programmer
The Jester Home in French
The concept of file protection, file sharing, file permissions is OS-specific, which is why it is not covered by standard C++
You could always write your own file buffer class, specialised in non-locking access to files and create fstream objects which use your file buffer class.
I understand that''s not what you want to hear, but that''s the only way to do it that I can see... beside using fstream.h
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[Docs (RTFM) | MSDN | SGI''s STL | OpenGL | File formats]
[C++ Must Haves (RTFS) | MinGW | Boost | Loki | FLTK | SDL ]
Stolen from Magmai Kai Holmlor, who held it from Oluseyi, who was inspired by Kylotan...
You could always write your own file buffer class, specialised in non-locking access to files and create fstream objects which use your file buffer class.
I understand that''s not what you want to hear, but that''s the only way to do it that I can see... beside using fstream.h
[Questions (STFW) | GDNet Start Here | GDNet Search | Forum FAQ | Google | Asking Smart Questions ]
[Docs (RTFM) | MSDN | SGI''s STL | OpenGL | File formats]
[C++ Must Haves (RTFS) | MinGW | Boost | Loki | FLTK | SDL ]
Stolen from Magmai Kai Holmlor, who held it from Oluseyi, who was inspired by Kylotan...
Author
This is annoying, thx for the reply all.
_______________
Jester, studient programmer
The Jester Home in French
_______________
Jester, studient programmer
The Jester Home in French
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