Closing the application by selecting 'Quit' menu item - wxWidgets 3.0 - c++

Question

So far I have written some simple code for a wxWidgets application, like creating a menu, frame and a few buttons. To follow the process of exiting, I have this function that shows a message box :
int OnExit( )
{
wxMessageBox( "Closing the application", wxOK | wxICON_INFORMATION )
return 0;
}
Closing the application by clicking close ( X ) button shows the message box and then exits. But closing it by clicking the "Quit" menu item doesn't work for me. I have tried copying some code from an old example and from CodeBlocks basic sample code that comes with wxWidgets project, with no luck. Please show me a method of closing the application from the menu item.

Answer 1

Try searching the web for "wxwidgets close window menu":
wxWidgets Hello World Example
In your OnExit function you need to call the Close method as in the example.

Answer 2

// Build: g++ this.cpp -std=gnu++11 $(wx-config --cxxflags --libs core,base)
#include <wx/wx.h>
class CApp : public wxApp
{
public:
bool OnInit() {
// Create the main frame.
wxFrame * frame = new wxFrame(NULL, wxID_ANY, wxT("demo"));
// Add the menubar
wxMenu * menus[] = {new wxMenu, new wxMenu};
wxString labels[] = {wxT("&File"), wxT("&Help")};
frame->wxFrame::SetMenuBar(new wxMenuBar(2, menus, labels));
menus[0]->Append(wxID_EXIT);
// Bind an event handling method for menu item wxID_EXIT.
this->Bind(wxEVT_MENU, [frame](wxCommandEvent &)->void{
frame->Close();
/* 1. method wxWindow::Close
* 2. event type wxEVT_CLOSE_WINDOW
* 3. method wxTopLevelWindow::OnCloseWindow
* 4. method wxTopLevelWindow::Destroy (overriding wxWindow::Destroy)
* 5. op delete
*/
}, wxID_EXIT);
// Enter the message loop.
frame->Centre(wxBOTH);
frame->Show(true);
return true;
}
int OnExit() {
wxMessageBox("Closing the application", wxEmptyString, wxOK | wxICON_INFORMATION);
return this->wxApp::OnExit();
}
};
wxDECLARE_APP(CApp);
wxIMPLEMENT_APP(CApp);