How to access a file with only the filepath as a string in Qt/C++?

Question

I currently have the filepath of the file that I want to access as a string, but I'm not sure if Qt has a feature that allows you to access that file with only the filepath.

I'm saving the filepath to an INI file and I want to take that filepath to open the json file that is a part of that path. This is what I've tried so far - the code would go into openFile()

void saveFileLocation(QString filename) 
{
    QSettings *settings = new QSettings(Ve::Widgets::SettingsWindowWidget::INI_FILE, QSettings::IniFormat);
    QDir dir;
    QString filePath = dir.filePath(filename);
    settings->setValue("projectFile", filePath);
    on_menuRecent_Files_aboutToShow(filePath);
}
void openFile(QString filepath) 
{   
    *insert code here*
}
void on_menuRecent_Files_aboutToShow(QString filePath)
{
    QAction* openAction = ui->menuRecent_Files->addAction(filePath);
    connect(openAction, SIGNAL(triggered()), this, SLOT(openFile(filePath)));


}

I want to implement an action option, that has text of the filepath, and when clicked, opens up the file that I want to access. Is there a Qt feature that allows you to do this?

"opens the file" as in "open the file to read its bytes" or "launch the associated application"? — Matteo Italia
– Matteo Italia, Commented Jun 7, 2019 at 20:39
saveFileLocation() is leaking the settings object. You don't really need to use new at all in that code, but if you do use it, you need to delete what you new. — Remy Lebeau
– Remy Lebeau, Commented Jun 7, 2019 at 20:41
What you mean by access is very vague. With that said Qt supports both options that @MatteoItalia mentioned. — drescherjm
– drescherjm, Commented Jun 7, 2019 at 20:42

Tom Kim · Accepted Answer · 2019-06-08 15:49:57Z

1

Try this:

To open with system default associated application:

void openFile(QString filepath) 
{   
    QDesktopServices::openUrl(QUrl::fromLocalFile( filepath ));
}

To open with specific application:

void openFile(QString filepath) 
{   
    // open with notepad
    QProcess::execute("notepad \""+ filepath +"\"");
}

Hope it helps you.

answered Jun 8, 2019 at 15:49

Tom Kim

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