new sample showing how to handle exceptions in wxWindows code
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23652 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
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samples/except/except.cpp
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318
samples/except/except.cpp
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/////////////////////////////////////////////////////////////////////////////
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// Name: except.cpp
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// Purpose: Except wxWindows sample
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// Author: Julian Smart
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// Modified by:
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// Created: 04/01/98
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// RCS-ID: $Id$
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx/wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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// for all others, include the necessary headers (this file is usually all you
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// need because it includes almost all "standard" wxWindows headers)
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#ifndef WX_PRECOMP
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#include "wx/app.h"
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#include "wx/frame.h"
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#include "wx/dialog.h"
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#include "wx/button.h"
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#include "wx/sizer.h"
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#include "wx/utils.h" // for wxMessageBox
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#endif
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// ----------------------------------------------------------------------------
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// resources
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// ----------------------------------------------------------------------------
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// the application icon (under Windows and OS/2 it is in resources)
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#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
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#include "../sample.xpm"
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#endif
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// ----------------------------------------------------------------------------
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// private classes
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// ----------------------------------------------------------------------------
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// Define a new application type, each program should derive a class from wxApp
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class MyApp : public wxApp
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{
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public:
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// override base class virtuals
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// ----------------------------
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// program startup
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virtual bool OnInit();
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// 2nd-level exception handling: we get all the exceptions occuring in any
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// event handler here
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virtual void HandleEvent(wxEvtHandler *handler,
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wxEventFunction func,
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wxEvent& event) const;
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// 3rd, and final, level exception handling: whenever an unhandled
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// exception is caught, this function is called
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virtual void OnUnhandledException();
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};
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// Define a new frame type: this is going to be our main frame
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class MyFrame : public wxFrame
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{
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public:
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// ctor(s)
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MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
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long style = wxDEFAULT_FRAME_STYLE);
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// event handlers (these functions should _not_ be virtual)
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void OnQuit(wxCommandEvent& event);
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void OnAbout(wxCommandEvent& event);
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void OnDialog(wxCommandEvent& event);
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void OnThrowString(wxCommandEvent& event);
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// 1st-level exception handling: we overload ProcessEvent() to be able to
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// catch exceptions which occur in MyFrame methods here
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virtual bool ProcessEvent(wxEvent& event);
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private:
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// any class wishing to process wxWindows events must use this macro
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DECLARE_EVENT_TABLE()
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};
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// A simple dialog which has only some buttons to throw exceptions
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class MyDialog : public wxDialog
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{
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public:
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MyDialog(wxFrame *parent);
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// event handlers
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void OnThrowInt(wxCommandEvent& event);
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void OnThrowObject(wxCommandEvent& event);
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private:
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DECLARE_EVENT_TABLE()
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};
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// A trivial exception class
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class MyException
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{
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public:
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MyException(const wxString& msg) : m_msg(msg) { }
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const wxChar *what() const { return m_msg.c_str(); }
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private:
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wxString m_msg;
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};
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// IDs for the controls and the menu commands
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enum
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{
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// control ids
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Except_ThrowInt = 100,
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Except_ThrowObject,
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// menu items
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Except_ThrowString = 200,
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Except_Dialog,
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Except_Quit = wxID_EXIT,
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Except_About = wxID_ABOUT
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};
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// ----------------------------------------------------------------------------
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// event tables and other macros for wxWindows
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// ----------------------------------------------------------------------------
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// the event tables connect the wxWindows events with the functions (event
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// handlers) which process them. It can be also done at run-time, but for the
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// simple menu events like this the static method is much simpler.
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BEGIN_EVENT_TABLE(MyFrame, wxFrame)
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EVT_MENU(Except_Quit, MyFrame::OnQuit)
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EVT_MENU(Except_About, MyFrame::OnAbout)
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EVT_MENU(Except_Dialog, MyFrame::OnDialog)
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EVT_MENU(Except_ThrowString, MyFrame::OnThrowString)
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END_EVENT_TABLE()
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BEGIN_EVENT_TABLE(MyDialog, wxDialog)
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EVT_BUTTON(Except_ThrowInt, MyDialog::OnThrowInt)
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EVT_BUTTON(Except_ThrowObject, MyDialog::OnThrowObject)
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END_EVENT_TABLE()
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// Create a new application object: this macro will allow wxWindows to create
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// the application object during program execution (it's better than using a
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// static object for many reasons) and also implements the accessor function
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// wxGetApp() which will return the reference of the right type (i.e. MyApp and
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// not wxApp)
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IMPLEMENT_APP(MyApp)
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// ============================================================================
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// MyApp implementation
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// ============================================================================
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// 'Main program' equivalent: the program execution "starts" here
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bool MyApp::OnInit()
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{
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// create the main application window
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MyFrame *frame = new MyFrame(_T("Except wxWindows App"),
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wxPoint(50, 50), wxSize(450, 340));
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// and show it (the frames, unlike simple controls, are not shown when
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// created initially)
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frame->Show(true);
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// success: wxApp::OnRun() will be called which will enter the main message
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// loop and the application will run. If we returned false here, the
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// application would exit immediately.
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return true;
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}
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void
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MyApp::HandleEvent(wxEvtHandler *handler,
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wxEventFunction func,
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wxEvent& event) const
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{
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try
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{
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wxApp::HandleEvent(handler, func, event);
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}
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catch ( int i )
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{
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wxLogError(_T("Caught an int %d in MyApp."), i);
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}
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}
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void MyApp::OnUnhandledException()
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{
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wxMessageBox(_T("Unhandled exception caught, program will terminate."),
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_T("wxExcept Sample"), wxOK | wxICON_ERROR);
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}
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// ============================================================================
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// MyFrame implementation
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// ============================================================================
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// frame constructor
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MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size, long style)
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: wxFrame(NULL, -1, title, pos, size, style)
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{
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// set the frame icon
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SetIcon(wxICON(mondrian));
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#if wxUSE_MENUS
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// create a menu bar
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wxMenu *menuFile = new wxMenu;
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menuFile->Append(Except_Dialog, _T("Show &dialog\tCtrl-D"));
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menuFile->Append(Except_ThrowString, _T("Throw a &string\tCtrl-S"));
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menuFile->AppendSeparator();
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menuFile->Append(Except_Quit, _T("E&xit\tCtrl-Q"), _T("Quit this program"));
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wxMenu *helpMenu = new wxMenu;
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helpMenu->Append(Except_About, _T("&About...\tF1"), _T("Show about dialog"));
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// now append the freshly created menu to the menu bar...
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wxMenuBar *menuBar = new wxMenuBar();
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menuBar->Append(menuFile, _T("&File"));
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menuBar->Append(helpMenu, _T("&Help"));
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// ... and attach this menu bar to the frame
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SetMenuBar(menuBar);
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#endif // wxUSE_MENUS
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#if wxUSE_STATUSBAR && !defined(__WXWINCE__)
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// create a status bar just for fun (by default with 1 pane only)
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CreateStatusBar(2);
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SetStatusText(_T("Welcome to wxWindows!"));
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#endif // wxUSE_STATUSBAR
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}
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bool MyFrame::ProcessEvent(wxEvent& event)
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{
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try
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{
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return wxFrame::ProcessEvent(event);
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}
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catch ( const wxChar *msg )
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{
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wxLogMessage(_T("Caught a string \"%s\" in MyFrame"), msg);
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return true;
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}
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}
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void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
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{
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// true is to force the frame to close
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Close(true);
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}
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void MyFrame::OnDialog(wxCommandEvent& WXUNUSED(event))
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{
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MyDialog dlg(this);
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dlg.ShowModal();
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}
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void MyFrame::OnThrowString(wxCommandEvent& WXUNUSED(event))
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{
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throw _T("some string");
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}
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void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
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{
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wxString msg;
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msg.Printf( _T("This is the About dialog of the except sample.\n")
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_T("Welcome to %s"), wxVERSION_STRING);
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wxMessageBox(msg, _T("About Except"), wxOK | wxICON_INFORMATION, this);
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}
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// ============================================================================
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// MyDialog implementation
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// ============================================================================
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MyDialog::MyDialog(wxFrame *parent)
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: wxDialog(parent, -1, wxString(_T("Throw exception dialog")))
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{
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wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
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sizerTop->Add(new wxButton(this, Except_ThrowInt, _T("Throw &int")),
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0, wxCENTRE | wxALL, 5);
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sizerTop->Add(new wxButton(this, Except_ThrowObject, _T("Throw &object")),
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0, wxCENTRE | wxALL, 5);
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sizerTop->Add(new wxButton(this, wxID_CANCEL, _T("&Cancel")),
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0, wxCENTRE | wxALL, 5);
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SetSizer(sizerTop);
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sizerTop->Fit(this);
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}
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void MyDialog::OnThrowInt(wxCommandEvent& WXUNUSED(event))
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{
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throw 17;
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}
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void MyDialog::OnThrowObject(wxCommandEvent& WXUNUSED(event))
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{
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throw MyException(_T("Exception thrown from the dialog"));
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}
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