使用 gtkmm / c++ 关闭 main window ffrom 消息框

Question

如果我单击“确定”按钮，我想在消息框中关闭主window。

class usb_boot : public Gtk::Window{

public:
    usb_boot();

并从消息框

我试过了

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;
    }

如何关闭主window？

Answer 1

您应该尽可能避免使用原始 new/delete（例如此处）。对于消息对话框，您可以使用简单的范围：

#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);
}

此外，在您的代码中，您调用了 usb_boot().close()，但请注意 usb_boot 之后的额外括号。这将构造一个新的 usb_boot 对象（因为您调用了构造函数）并立即将其关闭。在上面的示例中，我调用了 w.close()，而不是 MainWindow().close()。

使用 gtkmm / c++ 关闭 main window ffrom 消息框

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