Re: [SLUG] C++ fstream class

Lucas King Wed, 10 Mar 2004 19:50:48 -0800

many thanks to those that replied. it works. i have been trying to make this work for the past three days. again thanks.

regards,

Lucas

[EMAIL PROTECTED] wrote:

On Thu, Mar 11, 2004 at 01:10:16AM +1100, Matthew Wlazlo wrote:

Ok let's try that again (hope i read the question right this time!)

using namespace std;
using namespace __gnu_cxx;

....

int fd = open("test.txt", O_RDONLY);
stdio_filebuf<char> in(fd, ios::in, false, 1024);
istream inf(&in);

string str;
while(!inf.eof()) {
        inf >> str;
        cout << str << endl;
}

close(fd);


Thanks!  I modified that program to use popen,
added the required headers, did a bit of error checking
and stuff and got the following.  Tested under
solaris/gcc3.3.1 and fedora/gcc3.3.2:

Note that I needed to change your if (!feof...).
because I was getting "world" twice.  I guess
that was a bug.  Anyway while(inf << ...) is
more idiomatic imho.  I got the same bug with
fopen as well as popen, fwiw.


#include <iostream>
#include <cstdio>
#include <ext/stdio_filebuf.h>


using namespace std;
using namespace __gnu_cxx;


int
main()
{

        FILE* fp = popen("echo hello, world", "r");
        if (0 == fp) {
                perror("popen");
                return 1;
        }

        stdio_filebuf<char> in(fp, ios::in);
        istream inf(&in);

        string str;
        while(inf >> str)
        {
                cout << str << endl;
        }
        cout << flush;

        if (-1 == fclose(fp)) {
                perror("fclose");
                return 1;
        }
}

************************************************************************ The information contained in this e-mail message and any accompanying files is or may be confidential.If you are not the intended recipient, any use, dissemination, reliance,forwarding, printing or copying of this e-mail or any attached files is unauthorised.This e-mail is subject to copyright. No part of it should be reproduced,adapted or communicated without the written consent of the copyright owner.If you have received this e-mail in error, please advise the sender immediately by return e-mail, or telephone and delete all copies.Fairfax does not guarantee the accuracy or completeness of any information contained in this e-mail or attached files. Internet communications are not secure, therefore Fairfax does not accept legal responsibility for the contents of this message or attached files. ************************************************************************

--
SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/
Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html

Re: [SLUG] C++ fstream class

Reply via email to