Close main window ffrom messagebox using gtkmm / c++ - c++

Question

From a message box i'd like to close the main window if i click on Ok button.
class usb_boot : public Gtk::Window{
public:
usb_boot();
and from message box
i tried this
void usb_boot::creation(){
//Gtk::MessageDialog dialog(*this, dropdownList.get_active_text());
std::string message("Format : " + type);
Gtk::MessageDialog *dialog = new Gtk::MessageDialog("Resume", true, Gtk::MESSAGE_QUESTION, Gtk::BUTTONS_YES_NO);
dialog->set_title("Resume");
dialog->set_message(dropdownList.get_active_text());
dialog->set_secondary_text(message);
dialog->set_default_response(Gtk::RESPONSE_YES);
int result = dialog->run();
switch(result){
case(Gtk::RESPONSE_YES):{
std::cout << "next program" << std::endl;
delete dialog;// ok work
usb_boot().close();//compile but doesn't close main window
break;
}
How to close the main window ?

Answer 1

You should avoid using raw new/delete whenever you can (like here, for instance). For message dialogs, you can use simple scopes:
#include <iostream>
#include <gtkmm.h>
class MainWindow : public Gtk::ApplicationWindow
{
public:
MainWindow() = default;
};
int main(int argc, char **argv)
{
auto app = Gtk::Application::create(argc, argv, "so.question.q63872817");
MainWindow w;
w.show_all();
int result;
// Here we put the dialog inside a scope so that it is destroyed
// automatically when the user makes a choice (you could do it
// inside a function instead of a free scope):
{
Gtk::MessageDialog dialog(w, "Message dialog", true, Gtk::MESSAGE_QUESTION, Gtk::BUTTONS_YES_NO);
dialog.set_title("Title");
dialog.set_message("Primary message");
dialog.set_secondary_text("Secondary message");
dialog.set_default_response(Gtk::RESPONSE_YES);
result = dialog.run();
} // Here the dialog is destroyed and closed.
if(result == Gtk::RESPONSE_YES)
{
std::cout << "Closing main window..." << std::endl;
//MainWindow().close(); // Will not work!
w.close();
}
return app->run(w);
}
Also, in your code, you call usb_boot().close(), but notice the extra parenthesis after usb_boot. This constructs a new usb_boot object (since you call the constructor) and immediately closes it. In the example above, I called w.close(), instead of MainWindow().close().