fstream : sh_write is not a member of 'std::basic_filebuf<_Elem,_Traits>'

[devendraC]

Hi

I am using fstream class for file I/O operations. When I upgrade my compiler to VC++ 7.1 from VC 6.0 I get compilation error on fstream related operation.
With 6.0 I was using include fstream.h, while with VC++ 7.1 I am using fstream as fstream.h is no longer supported with 7.1.

Sample Code:
filebuf *pFb = Fb.open ("abc", ios:ut, filebuf::sh_write);

Error:
sh_write is not a member of 'std::basic_filebuf<_Elem,_Traits>'


Regards
Devendra

[Acidy]

MSDN said

basic_filebuf *open(
   const char *_Filename,
   ios_base::openmode _Mode
);

where the 3rd param?

[JohnW@Wessex]

fstream is part of the STL library and is not the same as that used by fstream.h.

What you probably need is...

   filebuf *pFb = Fb.open("abc", ios_base::out);

From MSDN...

ios_base:penmode

typedef T3 openmode; static const openmode app, ate, binary, in, out, trunc; The type is an enumerated type T3 that describes an object that can store the opening mode for several iostreams objects. The distinct flag values are:

• app, to seek to the end of a stream before each insertion
• ate, to seek to the end of a stream when its controlling object is first created
• binary, to read a file as a binary stream, rather than as a text stream
• in, to permit extraction from a stream
• out, to permit insertion to a stream
• trunc, to truncate an existing file when its controlling object is first created

[devendraC]

Thanks John.

So with fstream the open function have 2 parameters only.

But what is the alternate of sh_write/sh_read in fstream now ??

Regards
Devendra

[NoHero]

But what is the alternate of sh_write/sh_read in fstream now ??

To write to a file use an ofstream to read use an ifstream.