run Macos terminal command from QT

sashapont

I try to execute command but there are no result in output... :( I try
QStringList arguments;
arguments << "";
QProcess exec;
exec.start("time", arguments);
exec.waitForFinished();
qDebug() << exec.readAllStandardOutput();

And I try

 QStringList arguments;
arguments <<"time";
 QProcess exec;
 exec.start("/bin/sh", arguments);
 exec.waitForFinished();
 qDebug() << exec.readAllStandardOutput();

What I am doing wrong?

koahnig

The output of time is rather short IIRC. This might be a buffer problem. Try to use a commend with considerably more output and check if this is shown.
At least this tells you if you have a fundamental problem.

mrjj

did you try with full path for time ?
/usr/bin/time or where it is on your distro

Also if you run it by hand as "/bin/sh time" does that produce the result you expect?

sashapont

Is not work

mrjj

@sashapont
I think your issue is the sh shell.

if you read
http://stackoverflow.com/questions/10701504/command-working-in-terminal-but-not-via-qprocess

it seems you need "-c" to make SH run the time command as its external.

 QStringList arguments;
arguments << "-c" << "time" ;
 QProcess exec;
 exec.start("/bin/sh", arguments);
 exec.waitForFinished();
 qDebug() << exec.readAllStandardOutput();

mrjj

note

it seems that "time" displays on stderror so you need to read from readAllStandardError and not readAllStandardOutput

Below code display output of time on ubuntu box.

#include <QStringList>
#include <QProcess>
#include <QDebug>
#include <QByteArray>
 
 
int main(int argc, char *argv[])
{
    QProcess exec;
    QStringList arguments;
    arguments <<  "-c" << "time" ;
    exec.start("/bin/sh", arguments);
    int res=exec.waitForStarted();
 
    if (! res )
    qDebug() << exec.errorString();
 
    exec.waitForFinished();
    QByteArray outData1 = exec.readAllStandardOutput();
    qDebug()<<QString(outData1);
    QByteArray outData2 = exec.readAllStandardError();
    qDebug()<<QString(outData2);
 
}