Howto distinguish Application Quit from System Shutdown

Howto distinguish Application Quit from System Shutdown

By : Randy
Date : October 25 2020, 12:12 PM
help you fix your problem For application quit, add a listener and use windowClosed event on the main window.
For system quit, you can use addShutdownHook.
code :

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Qt Application Blocking System Shutdown

Qt Application Blocking System Shutdown

By : Christian Solano
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You need to reimplement QCoreApplication::winEventFilter in your QCoreApplication / QApplication derived class, and handle the WM_QUERYENDSESSION message there.
I'm not sure whether WM_QUERYENDSESSION will be delivered to your application or whether it's a broadcast system message (and I don't have a Windows machine handy to test.) If you don't seem to receive this message there, you'll need to install an event filter.
Force application close on system shutdown

Force application close on system shutdown

By : bat7man
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , In your FormClosing event check the FormClosingEventArgs' CloseReason property to see why the window is closing down. If it is CloseReason.WindowsShutDown then don't show your dialog and do not cancel the closing of your form.
code :
private void MyForm_FormClosing(object sender, FormClosingEventArgs e)
    // Verify that we're not being closed because windows is shutting down.
    if (e.CloseReason != CloseReason.WindowsShutDown)
        // Show your dialog / cancel closing. 
How to store text on the system clipboard after application has quit using GTK3?

How to store text on the system clipboard after application has quit using GTK3?

By : user152948
Date : March 29 2020, 07:55 AM
Hope this helps GDK_SELECTION_PRIMARY -> is used to get the currently-selected object or text GDK_SELECTION_CLIPBOARD -> is used perform operations like Cut/copy/paste (https://developer.gnome.org/gtk3/stable/gtk3-Clipboards.html#gtk-clipboard-get-for-display)
and to store a text the application has to remain in the main loop long enough to let the clipboard manager copy the text.
code :
#include <gtk/gtk.h>

void callback(GtkClipboard *clipboard, const gchar *text, gpointer data) {
  printf("In callback: text = '%s'\n", text);

int main() {
  gtk_init(NULL, NULL);
  GdkScreen *screen = gdk_screen_get_default();
  GdkDisplay *display = gdk_display_get_default();
  GtkClipboard *clipboard =
      gtk_clipboard_get_for_display(display, GDK_SELECTION_CLIPBOARD);
  gtk_clipboard_set_text(clipboard, "Hello world", -1);
  gtk_clipboard_request_text(clipboard, callback, NULL);
  if (gdk_display_supports_clipboard_persistence(display)) {
    printf("Supports clipboard persistence.\n");

  g_timeout_add(100, gtk_main_quit, NULL);
Cannot determine the cause of System.ObjectDisposedException during application shutdown

Cannot determine the cause of System.ObjectDisposedException during application shutdown

By : Ăńă ÀsLń Wàd Âbóålì
Date : March 29 2020, 07:55 AM
This might help you I am presuming that you are using VisualStudio as your debugging environment.
Click menu item "Debug" Click menu item "Exception ..." Open tree item "Common Language Runtime Exception" Open tree item "System" Scroll down to "System.ObjectDisposedException" Check its CheckBox for "Thrown" Click "OK"
How do i decide if to quit or not with a message from my application using shutdown hook?

How do i decide if to quit or not with a message from my application using shutdown hook?

By : jonathaniel1337
Date : March 29 2020, 07:55 AM
Hope this helps I'm afraid you're looking in the wrong direction. I'd start with the following:
Identify a place in your app where you want to prompt user for confirmation: Activity, Fragment. Example: you can show this dialog when user is going back from specific Activity Use one of callbacks like onBackPressed() in Activity to present a dialog.
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