Best Direction on Spawning Process Async

[cka via Digitalmars-d-learn]

On Wednesday, 16 September 2015 at 16:30:46 UTC, Mike McKee wrote:
> This really shows the beauty and simplicity of the D language 
> compared to C++. Check this out in Qt/C++:
>
> http://stackoverflow.com/questions/32593463/spawn-async-qprocess-from-dynamic-library-peek-output-until-done
>
> ...see how much nicer the D version is here that Ali did, 
> versus the Qt/C++ technique.

Here is an alternative Qt sample to handle the output of a 
process line by line and to get notified when it finishes:


#include <QCoreApplication>
#include <QProcess>

int main(int argc, char *argv[])
{
     QCoreApplication a(argc, argv);

     QProcess scanner;

     QObject::connect(&scanner, &QProcess::readyRead, [&] {
         while (!scanner.atEnd()) {
             auto line = scanner.readLine();
             // process line
         }
     });

     // select the QProcess::finished(int) overload
     void (QProcess::*finishedSignal)(int) = &QProcess::finished;

     QObject::connect(&scanner, finishedSignal, [] (int) {
        // proces finished
        QCoreApplication::quit();
     });

     scanner.start("avscanner");

     return a.exec();
}