Delete a QTemporaryFile which is in use by a different app

[ProgSys]

I wrote an application which displays the file contents of a custom archive in a QTreeView.
The user can then double click a file to open it in a default application.

I extract the file into a QTemporaryFile and run QDesktopServices::openUrl(QUrl(tempfile->fileName())) to open it.
The problem is, when the application is closed while the temporary file is still open by the default application, it doesn't get deleted (tempfile->remove() returns false).

Is there a way to force delete the file or is there maybe a better way doing this?

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QDesktopServices>
#include <QUrl>
#include <QDebug>
#include <QByteArray>

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

    m_tempFile = new QTemporaryFile("tempXXXXXX.mp3", this);
    m_tempFile->setAutoRemove(true);
    m_tempFile->open();

    QFile testFile("your_song.mp3");
    testFile.open(QIODevice::ReadOnly);
    QByteArray fileData(testFile.readAll());

    QDataStream out(m_tempFile);
    out<<fileData;
    m_tempFile->close();

    qDebug()<<"Opening "<< m_tempFile->fileName();
    //is opned (in my case) by VLC
    QDesktopServices::openUrl(QUrl("file:///"+m_tempFile->fileName()));

}

MainWindow::~MainWindow()
{
    // if app is closed tempXXXXXX.mp3 doesn't get deleted
    if(!m_tempFile->remove())
        qDebug()<<"Couldn't delete "<< m_tempFile->fileName();

    delete m_tempFile;
    delete ui;
}

[SGaist]

Hi and welcome to devnet,

Are you using Windows ? Depending on how the file is opened, you can't delete it.

[ProgSys]

@SGaist Yes, I am using Windows. Is there maybe a way to mark the files for deletion on reboot? So they at least get removed later.

[alex_malyu]

@ProgSys said:

Is there maybe a way to mark the files for deletion on reboot? So they at least get removed later.

AFAIK there is no such way,
The best you can do - ask user if he wants to stop using file and delete it or maintain a list of remained to be deleted files and check it on next start-up and ask if user want to delete them.

[ProgSys]

@alex_malyu Ok, I guess I'll just pop up some error messages.