Solved Application Interface

[JasonB]

Hi,

How can I open a certain file with the default application when a button is clicked?

In other words what I want is to be able to open a file when a button is click.

[Joel Bodenmann]

@JasonB You can use QDesktopServices::openUrl(). From the documentation:

"If the URL is a reference to a local file (i.e., the URL scheme is "file") then it will be opened with a suitable application instead of a Web browser."

[JasonB]

This is my code ,I m trying to open a pdf file (ubuntu 12.04) but it is not opening.

void MainWindow::on_pushButton_clicked()
{
// QProcess* process = new QProcess;
// QString program = "/home/mytsp00042/Desktop/try.txt";
// process->start(program);

QDesktopServices::openUrl(QUrl::fromUserInput("file::/home/mytsp00042/Desktop/c-gui-programming-with-qt-4-2ndedition(1).pdf"));;

}

[mcosta]

Hi and welcome to devnet,

for local files I suggest to use QUrl::fromLocalFile()
BTW the to use file protocol you should use 3 slashes file:///home/mytsp00042/Desktop/c-gui-programming-with-qt-4-2ndedition(1).pdf

[JasonB]

@mcosta Hey, i tried both.. none of them is working.
void MainWindow::on_pushButton_clicked()
{
QProcess* process = new QProcess;
QString program = "cmd.exe";
process->execute(program);
i tried this code on windows and it worked. but same code is not working on Ubuntu 12.04.

[mcosta]

@JasonB said:

@mcosta Hey, i tried both.. none of them is working.
void MainWindow::on_pushButton_clicked()
{
QProcess* process = new QProcess;
QString program = "cmd.exe";
process->execute(program);
i tried this code on windows and it worked. but same code is not working on Ubuntu 12.04.

"cmd.exe" on Linux? (or I missed something)

To make QDestokService::openUrl() working you must be sure your system has a default application for PDF files

[JasonB]

@mcosta yeah it is having deafault pdf viewer

QDesktopServices ::openUrl(QUrl::fromLocalFile("file::///home/mytsp00042/Desktop/c-gui-programming-with-qt-4-2ndedition(1).pdf"));

i tried that code. no success.

[JKSH]

@JasonB said:

QDesktopServices ::openUrl(QUrl::fromLocalFile("file::///home/mytsp00042/Desktop/c-gui-programming-with-qt-4-2ndedition(1).pdf"));

Is that a typo? You're only supposed to have 1 colon (':').

Anyway, you can check if your QUrl is correct or not:

QUrl url = QUrl::fromLocalFile("file:///home/mytsp00042/Desktop/c-gui-programming-with-qt-4-2ndedition(1).pdf");
qDebug() << url.isValid();

QString str = url.toLocalFile();
QFile file(str);
qDebug() << file.exists();

[Joel Bodenmann]

This Qt 5.4 program works very well for me on both Linux and Windows:

#include <QApplication>
#include <QString>
#include <QDir>
#include <QUrl>
#include <QDesktopServices>

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

    QString path = QDir::toNativeSeparators("/home/tectu/Desktop/foo.pdf");
    QDesktopServices::openUrl(QUrl("file:///" + path));

    return a.exec();
}

[mcosta]

@JasonB said:

@mcosta yeah it is having deafault pdf viewer

QDesktopServices ::openUrl(QUrl::fromLocalFile("file::///home/mytsp00042/Desktop/c-gui-programming-with-qt-4-2ndedition(1).pdf"));

i tried that code. no success.

you have to use a single colon : character in the URL

[JasonB]

@Joel-Bodenmann
Thanks.
Its working.

[Joel Bodenmann]

@JasonB Glad to hear that.
Can you please mark this thread as [SOLVED] and upvote the answer(s) that helped you solving your problem?