[Boost-users] Boost Process continuously read output

Subject: [Boost-users] Boost Process continuously read output
From: Surya Kiran Gullapalli (suryakiran.gullapalli_at_[hidden])
Date: 2018-05-16 03:11:10

Hi,
I'm trying to read outputs/logs from different processes and display them
in a GUI. The processes will be running for long time and produce huge
output. I'm planning to stream the output from those processes and display
them according to my needs. All the while allow my gui application to take
user inputs and perform other actions.

What I've done here is, from main thread launch two threads for each
process. One for launching the process and another for reading output from
the process.

This is the solution I've come up thus far.

// Process Class
class MyProcess {
namespace bp = boost::process;
boost::asio::io_service mService; // member variable of the class
bp::ipstream mStream // member variable of the class
std::thread mProcessThread, mReaderThread // member variables of the class.

public void launch();
};

void
MyProcess::launch()
{
mReaderThread = std::thread([&](){
std::string line;
while(getline(mStream, line)) {
std::cout << line << std::endl;
}
});

mProcessThread = std::thread([&]() {
auto c = boost::child ("/path/of/executable", bp::std_out > mStream,
mService);

mService.run();
mStream.pipe().close();
}
}

// Main Gui class
class MyGui
{
MyProcess process;
void launchProcess();
}

MyGui::launchProcess()
{
process.launch();
doSomethingElse();
}

The program is working as expected so far. But I'm not sure if this is the
correct solution. Please let me know if there's any
alternative/better/correct solution

Thanks,
Surya