QPushButton that run external app

AZimmerer

Hi,

I have a quick question. I created a QPushButton called extapp_btn.
Now I want to connect it with an external app. In my example bellow
I push the button and notepad.exe should start.

How can I connect them?

-example code ----------------------------------

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QWebView>
#include <QUrl>
#include <QPushButton>
#include <QProcess>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->webView->load(QUrl("http://localhost"));

QPushButton * extapp_btn = new QPushButton(this);
extapp_btn->setGeometry(540,440,93,27);
extapp_btn->setText("External App");

QProcess *proc = new QProcess (this);
// proc->start ("notepad.exe");

QObject::connect(extapp_btn_btn,SIGNAL(clicked()),qApp,SLOT( START EXTERNAL APP ));

}

MainWindow::~MainWindow()
{
delete ui;
}

mrjj

Well just put the QProcess code into
START EXTERNAL APP slot ?
Or do u ask how to make slot ?
Also you say that qApp has the slot.
Dont you mean "this" for mainwidow ?

AZimmerer

Thanks for helping me out. I am complete noob. So what I want to do is. If I click on the button „extapp_btn“ notpad should start. How do I have to modify my code?

mrjj

@AZimmerer

You should read this
http://doc.qt.io/qt-5/signalsandslots.html

Anyway, you need to add slot to mainwin.

class MainWindow : public QMainWindow
{
Q_OBJECT
....
private slots: // this you might to write too
void StartApp(); // this is the slot. a normal function
..

and in mainwindow.cpp
void MainWindow::StartApp() {
QProcess::startDetached("notepad.exe");
}

then
QObject::connect(extapp_btn_btn,SIGNAL(clicked()),this,SLOT( StartApp()));

AZimmerer

thank you very much. worked like a charm :D

Gojir4

Hi,

You can even give the file to be opened in arguments :

QProcess::startDetached("notepad++",  QStringList() << "path/to/the/file.txt");

AZimmerer

@Gojir4 said in QPushButton that run external app:

Hi,

You can even give the file to be opened in arguments :
QProcess::startDetached("notepad++",  QStringList() << "path/to/the/file.txt");

Thanks for the help. much appreciated

QPushButton that run external app

MainWindow::~MainWindow() { delete ui; }

MainWindow::~MainWindow()
{
delete ui;
}