QProgressDialog not displayed

robcont_

Hi,
I have a TaskManager that has to perform some long operation. Since the operation has not a fixed duration I want a QProgressDialog to be displayed with an undefined progress bar.
Below is my code but it does not work: the dialog is not displayed. Where am I doing wrong?

auto response = QMessageBox::question(this, "Confirm", "Are you sure you want to install?");
if (response == QMessageBox::StandardButton::Yes) 
{
    QProgressDialog progress("Installing...", "Abort", 0, 0, this);
    progress.setWindowModality(Qt::WindowModality::WindowModal);
    progress.show();

    QThread *thread = new QThread(this);
    TaskManager *task = new TaskManager();
    task->moveToThread(thread);

    connect(task,   &TaskManager::installed, task,      &TaskManager::deleteLater);
    connect(task,   &TaskManager::installed, thread,    &QThread::quit);
    connect(task,   &TaskManager::installed, &progress, &QProgressDialog::close);
    connect(thread, &QThread::started,       task,      &TaskManager::install);
    connect(thread, &QThread::finished,      thread,    &QThread::deleteLater);
    
    thread->start();
}

mrjj

Hi
Best guess is that the variable
QProgressDialog progress;
is deleted very soon as the function ends.
so even thread lives, the actual QProgressDialog does not.

try
QProgressDialog *progress = new QProgressDialog("Installing...", "Abort", 0, 0, this);

robcont_

@mrjj said in QProgressDialog not displayed:

Hi
Best guess is that the variable
QProgressDialog progress;
is deleted very soon as the function ends.
so even thread lives, the actual QProgressDialog does not.

try
QProgressDialog *progress = new QProgressDialog("Installing...", "Abort", 0, 0, this);

Thanks it works! It was a very simple solution.