To call a string containing file path in a command

[Nick_Neo]

void MainWindow::on_pushButton_clicked()
{
    QString filename = QFileDialog::getOpenFileName(this, tr("Open"),
                                                    "S://MATLAB/",
                                                    "MATLAB Code files (*.m);;All Files (*.*)");
    QProcess* p = new QProcess(this);
    p->start("C:/\"Program Files\"/MATLAB/R2013a/bin/matlab.exe -nosplash -nojvm -r run('filename');");
}

void MainWindow::on_pushButton_clicked()
{
    QString filename = QFileDialog::getOpenFileName(this, tr("Open"),
                                                    "S://MATLAB/",
                                                    "MATLAB Code files (*.m);;All Files (*.*)");
    QProcess* p = new QProcess(this);
    p->start("C:/\"Program Files\"/MATLAB/R2013a/bin/matlab.exe -nosplash -nojvm -r run('filename');");
}

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But I'm unable to use the string filename to run MATLAB script file. Instead of sending the file path like "S:/MATLAB/test.m" , the variable name "filename" is being executed in the run command. I have to manually enter the file path. Is there any other way to redirect the file path to run it directly on a mouse-click.?

[stampede]

You need to use the value of variable 'filename' and not the string constant "filename".

p->start( QString("C:/\"Program Files\"/MATLAB/R2013a/bin/matlab.exe -nosplash -nojvm -r run('%1');").arg(filename) );

p->start( QString("C:/\"Program Files\"/MATLAB/R2013a/bin/matlab.exe -nosplash -nojvm -r run('%1');").arg(filename) );

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void function(const QString& s);
...
QString string = ...;
...
function(string);
...
function("string");

void function(const QString& s);
...
QString string = ...;
...
function(string);
...
function("string");

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Do you understand the difference between the two above function calls ?

[Nick_Neo]

Now I get it. Thank you

[Nick_Neo]

But what if my filename was S:/MATLAB files/test.m
In console window of MATLAB only the first part of the command i.e., run('S:/MATLAB is being executed giving an error :A MATLAB string constant is not terminated properly.

[Lesiok]

Use another variant of start method :

QString app( "C:/Program Files/MATLAB/R2013a/bin/matlab.exe" );
QStringList arguments;
arguments << "-nosplash" << "-nojvm" << "-r" << QString("run('%1')").arg(filename);
p->start(app,arguments);

QString app( "C:/Program Files/MATLAB/R2013a/bin/matlab.exe" );
QStringList arguments;
arguments << "-nosplash" << "-nojvm" << "-r" << QString("run('%1')").arg(filename);
p->start(app,arguments);

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[wysota]

You need to use proper shell escaping or use a variant of QProcess::start() which accepts arguments in separate strings.