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In c is it possible to open a file for read write and without using a buffer
or second file change one character in the file and close it modified form

ex.
status.txt contains:
This is mode 1.

change to

This is mode 3

dave wrote:
> In c is it possible to open a file for read write and without using a buffer
> or second file change one character in the file and close it modified form

see:

std:stream::seekp
std:stream::write

dave wrote in message ...
>In c is it possible to open a file for read write and without using a buffer
>or second file change one character in the file and close it modified form
>
>ex.
>status.txt contains:
>This is mode 1.
>
>change to
>
>This is mode 3


std::fstream Zstat("status.txt", std::ios:ut | std::ios::binary);
Zstat.seekp( 13 );
if( not Zstat ){
using std::cout; // for NG posting
cout<<" file error="<<Zstat.flags()<<std::endl;
cout<<" ios::good="<<Zstat.good()<<std::endl;
cout<<" ios::bad="<<Zstat.bad()<<std::endl;
cout<<" ios::eof="<<Zstat.eof()<<std::endl;
cout<<" ios::fail="<<Zstat.fail()<<std::endl;
}
else{
Zstat << "3";
}

--
Bob R
POVrookie

"BobR" <> wrote in message
news:NBb2h.166757$...
>
> dave wrote in message ...
> >In c is it possible to open a file for read write and without using a
buffer
> >or second file change one character in the file and close it modified
form
> >
> >ex.
> >status.txt contains:
> >This is mode 1.
> >
> >change to
> >
> >This is mode 3
>
>
> std::fstream Zstat("status.txt", std::ios:ut | std::ios::binary);
> Zstat.seekp( 13 );
> if( not Zstat ){
> using std::cout; // for NG posting
> cout<<" file error="<<Zstat.flags()<<std::endl;
> cout<<" ios::good="<<Zstat.good()<<std::endl;
> cout<<" ios::bad="<<Zstat.bad()<<std::endl;
> cout<<" ios::eof="<<Zstat.eof()<<std::endl;
> cout<<" ios::fail="<<Zstat.fail()<<std::endl;
> }
> else{
> Zstat << "3";
> }
>
> --
> Bob R
> POVrookie
>
>

how bout using fopen with *FILE and fputs

dave wrote in message ...
>
>how bout using fopen with *FILE and fputs

Why, when you have std::fstream?

std::ifstream Ping("Some.png", std::ios_base::binary );
std::vector<unsigned char> Image;
char In(0);
while( Ping.get( In ) ){
Image.push_back( static_cast<unsigned char>( In ) );
}
std::cout<<"\n Image.size() = "<<Image.size()<<" bytes."<<std::endl;

--
Bob R
POVrookie