turning off buffering with pipeinputstream

[ramneekhanda]

hi folks,
i am using pipeinputstream to get the output from my subprocess.. i am unable to figure out how to make it unbuffered and i have tried various options but it doesnt seem to work. here is what i have tried so far:

take 1:

Code: Select all

    Poco::Pipe outPipe;
    ProcessHandle ph = Poco::Process::launch(makeReplacement, params, 0, &outPipe, &outPipe);
    Poco::PipeInputStream istr(outPipe);
    std::string line;
    while (std::getline( istr, line )) {
        proj.projectStream << line;
    }


take 2:

Code: Select all

    Poco::Pipe outPipe;
    ProcessHandle ph = Poco::Process::launch(makeReplacement, params, 0, &outPipe, &outPipe);
    Poco::PipeInputStream istr(outPipe);
    istr.rdbuf()->pubsetbuf(0, 0);
    Poco::StreamCopier::copyStreamUnbuffered(istr, proj.projectStream);
    int retcode = ph.wait();


any help is appreciated!

[alex]

Apparently, some standard library implementations are not conforming. Since POCO PipeStreams are buffered, the only way around it would be to create your own unbuffered hierarchy.

[ramneekhanda]

Apparently, some standard library implementations are not conforming. Since POCO PipeStreams are buffered, the only way around it would be to create your own unbuffered hierarchy.

Hmm.. thought so.. Thanks .