«

Hi all,

I want to use a single std::stringbuf for writing (by a std:stream)
and for reading (by a std::istream), concurrently in two threads.
This came to my mind, because the code for reading should be the same
as with any ordinary istream, and it cannot be changed.

Now my problem is, that I do not get any data inside the reading loop
std:fstream tempfile("test.pdf", std::ios_base:ut |
std::ios_base::trunc | std::ios_base::binary);
while (!is->eof()) {
is->read(buffer, bufferSize);
tempfile.write(buffer, is->gcount());
tempfile.flush;
}

The writing thread proceeds as expected and finally finishes writing.

Any hints or comments?

Thanks,
Christoph

fuenfzig schrieb:

> Hi all,
>
> I want to use a single std::stringbuf for writing (by a std:stream)
> and for reading (by a std::istream), concurrently in two threads.
> This came to my mind, because the code for reading should be the same
> as with any ordinary istream, and it cannot be changed.
>
> Now my problem is, that I do not get any data inside the reading loop
> SNIP

Hi again,

let me put it differently. I just tested, that it does not depend on
multi-threading.
If I write to the stringbuf in a std:stream (or a std::iostream) and
then try to read
with a std::istream* is (or the same std::iostream* is), it does not
work either.
I immediatly get, (is->fail() == true)
Also tried is->seekg(0); with the same result.

Does anybody have an example showing usage of stringbuf with
std:stream and std::istream?
Or can somebody give some details on the internals, when
(is->fail()==true) and (is->eof()==true) does occur?

Thanks very much,
Christoph