multiple qprocess arguments

[czilla]

I am invoking a linux system process using QProcess. The process works, but when I supply more arguments than the three prescribed arguments it gives an error.

sox.start("sox", infile.wav -c 1 outfile.wav remix 0 1);

How can I make it accept my last argument "remix 0 1"?

#include <QtGui>
#include <QApplication>
 
int main(int argc, char* argv[])
{
   QApplication app(argc, argv);
 
   QProcess sox;            //instantiate the process****
   QStringList args1;       //declare arguments
   args1 << "infile.wav";   //collect arguments to be envoked with qprocess
   args1 << "-c 1";         //collect arguments to be envoked with qprocess
   args1 << "outfile.wav";  //collect arguments to be envoked with qprocess
   //args1 << "remix 0 1";  //collect arguments to be envoked with qprocess
 
   sox.start("sox", args1); //pass qprocess and arguments to start method
   QByteArray output;       //understood by QString
   while(sox.waitForReadyRead())
      output += sox.readAll();
qDebug() << "sox" << args1;
}

#include <QtGui>
#include <QApplication>

int main(int argc, char* argv[])
{
   QApplication app(argc, argv);

   QProcess sox;            //instantiate the process****
   QStringList args1;       //declare arguments
   args1 << "infile.wav";   //collect arguments to be envoked with qprocess
   args1 << "-c 1";         //collect arguments to be envoked with qprocess
   args1 << "outfile.wav";  //collect arguments to be envoked with qprocess
   //args1 << "remix 0 1";  //collect arguments to be envoked with qprocess

   sox.start("sox", args1); //pass qprocess and arguments to start method
   QByteArray output;       //understood by QString
   while(sox.waitForReadyRead())
      output += sox.readAll();
qDebug() << "sox" << args1;
}

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[Lesiok]

What it is "it gives an error" ? What error ?

[anda_skoa]

Are you sure that "remix 0 1" is a single argument?
Would you pass that quoted on the shell?

My guess is that these are actually three arguments

QStringList args1;
   args1 << "infile.wav";
   args1 << "-c";
   args1 << "1";
   args1 << "outfile.wav";
   args1 << "remix";
   args1 << "0";
   args1 << "1";

QStringList args1;
   args1 << "infile.wav";
   args1 << "-c";
   args1 << "1";
   args1 << "outfile.wav";
   args1 << "remix";
   args1 << "0";
   args1 << "1";

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or

QStringList args1;
args1 << "infile.wav" << "-c" << "1" << "outfile.wav" << "remixe" << "0" << "1";

QStringList args1;
args1 << "infile.wav" << "-c" << "1" << "outfile.wav" << "remixe" << "0" << "1";

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Rule of thumb: any space on the commandline starts a new argument, unless it is escaped or quoted.

Cheers,
_

[czilla]

apologies for not posting correctly.

When the system process is called by QProcess it does not produce any result, however when it is entered on a terminal it works. Here is the complete command:

sox infile.wav -c 1 outfile.wav remix 0 1

[Lesiok]

As anda_skoa said : You have 7 args not 3.