?
Solved

reset iostream

Posted on 1997-04-25
1
Medium Priority
?
367 Views
Last Modified: 2006-11-17
Can anyone tell me how I can reset an ostrstream.

char buf[512];
ostrstream os(buf,512);

//... put stuff into os

cout << os.rdbuf();

//... at this point I would like to reset
//... to the beginning of the stream in order
//... to use it again.

Thanks
Carson
0
Comment
Question by:carsonw
1 Comment
 

Accepted Solution

by:
Sigma031497 earned 100 total points
ID: 1162990
To set the read pointer, use seekg(pos, ios::beg), where pos is the offset from the start of the file.

To set the write pointer, use seekp(pos, ios::beg).

Hence in your case you want to do do

os.seekp(0, ios::beg);

Keep in mind, that the file will not be modified, just the write pointer. Any new data you write will overwrite the previous data, but data which you will not overwrite will remain. If you want to clear the file of all data, the only way you can do this is

os.close();
os.open(name, ios::out | ios::trunc);

0

Featured Post

Receive 1:1 tech help

Solve your biggest tech problems alongside global tech experts with 1:1 help.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.
Suggested Courses

579 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question