error when initialize ifstream with string

[Lingyun Yang]

hi every one,

I meet a compile error in my small homework program:
Can I innitialize ifstream with a string?
or I must come back to char* style string?


Thank you!

Lingyun


//----------- here is part of my small program ---------------
string dicname("tofel. bok.gb2312");

char buf[256];
ifstream fdic(dicname);
while(fdic.getl ine(buf,256))
{}

//---------------- Here is the compile error ------------------
/home/lyyang/cpp-proj/wordwar.cpp: In function `int main()':
/home/lyyang/cpp-proj/wordwar.cpp:29: error: no matching function for
call to `
std::basic_ifst ream<char, std::char_trait s<char> >::basic_ifstre am(
std::string&)'
/usr/lib/gcc-lib/i386-pc-linux-gnu/3.3.2/include/g++-v3/iosfwd:89:
error: candidates
are: std::basic_ifst ream<char, std::char_trait s<char>[color=blue]
>::basic_ifstre am(const std::basic_ifst ream<char,[/color]
std::char_trait s<char> >&)
/usr/lib/gcc-lib/i386-pc-linux-gnu/3.3.2/include/g++-v3/fstream:519:
error:
std::basic_ifst ream<_CharT, _Traits>::basic _ifstream(const
char*, std::_Ios_Openm ode) [with _CharT = char, _Traits =
std::char_trait s<char>]
/usr/lib/gcc-lib/i386-pc-linux-gnu/3.3.2/include/g++-v3/fstream:504:
error:
std::basic_ifst ream<_CharT, _Traits>::basic _ifstream()
[with
_CharT = char, _Traits = std::char_trait s<char>]

[Leor Zolman]

Re: error when initialize ifstream with string

On Sun, 11 Apr 2004 01:36:16 GMT, Lingyun Yang <yzine@insightb b.com> wrote:
[color=blue]
>hi every one,
>
>I meet a compile error in my small homework program:
>Can I innitialize ifstream with a string?
>or I must come back to char* style string?[/color]

The fstream constructors do require a char* style string, but fortunately
it is trivial to get one from a std::string: just apply the c_str() member
function, e.g.:
ifstream fdic(dicname.c_ str());
-leor

[color=blue]
>
>
>Thank you!
>
>Lingyun
>
>
>//----------- here is part of my small program ---------------
>string dicname("tofel. bok.gb2312");
>
>char buf[256];
>ifstream fdic(dicname);
>while(fdic.get line(buf,256))
>{}[/color]

--
Leor Zolman --- BD Software --- www.bdsoft.com
On-Site Training in C/C++, Java, Perl and Unix
C++ users: Download BD Software's free STL Error Message Decryptor at:

https://www.bdsoft.com/tools/stlfilt.html

[Leor Zolman]

Re: error when initialize ifstream with string

On Sun, 11 Apr 2004 01:36:16 GMT, Lingyun Yang <yzine@insightb b.com> wrote:
[color=blue]
>hi every one,
>
>I meet a compile error in my small homework program:
>Can I innitialize ifstream with a string?
>or I must come back to char* style string?[/color]

The fstream constructors do require a char* style string, but fortunately
it is trivial to get one from a std::string: just apply the c_str() member
function, e.g.:
ifstream fdic(dicname.c_ str());
-leor

[color=blue]
>
>
>Thank you!
>
>Lingyun
>
>
>//----------- here is part of my small program ---------------
>string dicname("tofel. bok.gb2312");
>
>char buf[256];
>ifstream fdic(dicname);
>while(fdic.get line(buf,256))
>{}[/color]

--
Leor Zolman --- BD Software --- www.bdsoft.com
On-Site Training in C/C++, Java, Perl and Unix
C++ users: Download BD Software's free STL Error Message Decryptor at:

https://www.bdsoft.com/tools/stlfilt.html

[David Harmon]

Re: error when initialize ifstream with string

On Sun, 11 Apr 2004 01:36:16 GMT in comp.lang.c++, Lingyun Yang
<yzine@insightb b.com> wrote,[color=blue]
>ifstream fdic(dicname);[/color]

ifstream fdic(dicname.c_ str());

[David Harmon]

Re: error when initialize ifstream with string

On Sun, 11 Apr 2004 01:36:16 GMT in comp.lang.c++, Lingyun Yang
<yzine@insightb b.com> wrote,[color=blue]
>ifstream fdic(dicname);[/color]

ifstream fdic(dicname.c_ str());