QProcess: invalid arguments

cdwijs

Hi All,

I'm working on a rasperry pi running rasperian, with Qt Creator 4.2.0 based on Qt 5.7.1
I'm trying to start the external process "raspivid -o file.h264". I've written the following code snippet:

void ExternalCamera::slotStartCapture(QString filename)
{
    QStringList arguments;

    arguments <<"-o file.h264";


    myProcess->setArguments(arguments);
    myProcess->setProgram("/usr/bin/raspivid");

    myProcess->start();
    myProcess->waitForFinished(20000);
    qDebug()<<myProcess->exitCode();
    qDebug()<<myProcess->errorString();


}

Then I see this in the applications output window:

"Invalid command line option (-o file.h264)\n"
64
"Unknown error"

What am I doing wrong?
Cheers,
Cedric

mrjj

Hi
can you try
arguments <<"-o" << "file.h264";

SGaist

Hi,

As @mrjj as well as QProcess's documentation, each element of the options should be put in the argument list separately.

cdwijs

@mrjj said in QProcess: invalid arguments:

arguments <<"-o" << "file.h264";

It works, Thank you. For future reference:

void ExternalCamera::slotStartCapture(QString filename)
{
    QStringList arguments;
    arguments <<"-o" << "file.h264";
    //arguments <<"-o file.h264";


    myProcess->setArguments(arguments);
    myProcess->setProgram("/usr/bin/raspivid");

    myProcess->start();
    myProcess->waitForFinished(20000);
    qDebug()<<myProcess->exitCode();
    qDebug()<<myProcess->errorString();


}

console output:

0
"Unknown error"

Pablo J. Rogina

@cdwijs it looks your issue is solved. If so, please don't forget to mark your post as such. Thanks.