#include <QProcess>
#include <QStringList>

#include <QProcess>
#include <QStringList>
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(hello()));
    delete ui;
}

void MainWindow::hello()
{
    QStringList arguments;
    arguments << "Enable custom transitions" << "Droid Sans" << "Black";
    QProcess::execute("/path/to/my/script/script.sh", arguments);
}

ui->myComboBox->doStuff();

#include <QtCore>
#include <QtGui>

class MainWindow : .....
{
   // ....

   public slots:
      void hello();
   
  // ....
};

ui->myComboBox->currentText(); //This property holds the text of the current item.

connect(ui->myComboBox, SIGNAL(currentIndexChanged(QString),
this,
SLOT(comboBoxCurrentIndexChanged(QString));

void MainWindow::comboBoxCurrentIndexChanged(const QString &text) {
   //Do something
}