added possibility to throw different objects and crash directly from the main frame; use OnExceptionInMainLoop() instead of overriding HandleEvent()
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31937 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
parent
226c11c076
commit
cc9a39576a
@ -55,6 +55,16 @@
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#include "../sample.xpm"
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#endif
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// ----------------------------------------------------------------------------
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// private functions
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// ----------------------------------------------------------------------------
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static void DoCrash()
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{
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char *p = 0;
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strcpy(p, "Let's crash");
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}
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// ----------------------------------------------------------------------------
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// private classes
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// ----------------------------------------------------------------------------
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@ -71,13 +81,15 @@ public:
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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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virtual bool OnExceptionInMainLoop();
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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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// and now for something different: this function is called in case of a
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// crash (e.g. dereferencing null pointer, division by 0, ...)
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virtual void OnFatalException();
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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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@ -85,14 +97,20 @@ 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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MyFrame();
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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 OnThrowInt(wxCommandEvent& event);
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void OnThrowString(wxCommandEvent& event);
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void OnThrowObject(wxCommandEvent& event);
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void OnThrowUnhandled(wxCommandEvent& event);
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void OnCrash(wxCommandEvent& event);
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void OnHandleCrash(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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@ -130,6 +148,11 @@ private:
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wxString m_msg;
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};
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// Another exception class which just has to be different from anything else
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class UnhandledException
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{
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};
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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@ -137,13 +160,13 @@ private:
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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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// control ids and menu items
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Except_ThrowInt = 100,
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Except_ThrowString,
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Except_ThrowObject,
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Except_ThrowUnhandled,
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Except_Crash,
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// menu items
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Except_ThrowString = 200,
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Except_HandleCrash,
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Except_Dialog,
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Except_Quit = wxID_EXIT,
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@ -161,7 +184,12 @@ 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_ThrowInt, MyFrame::OnThrowInt)
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EVT_MENU(Except_ThrowString, MyFrame::OnThrowString)
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EVT_MENU(Except_ThrowObject, MyFrame::OnThrowObject)
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EVT_MENU(Except_ThrowUnhandled, MyFrame::OnThrowUnhandled)
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EVT_MENU(Except_Crash, MyFrame::OnCrash)
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EVT_MENU(Except_HandleCrash, MyFrame::OnHandleCrash)
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END_EVENT_TABLE()
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BEGIN_EVENT_TABLE(MyDialog, wxDialog)
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@ -185,8 +213,7 @@ IMPLEMENT_APP(MyApp)
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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 wxWidgets App"),
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wxPoint(50, 50), wxSize(450, 340));
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MyFrame *frame = new MyFrame();
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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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@ -198,24 +225,49 @@ bool MyApp::OnInit()
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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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bool MyApp::OnExceptionInMainLoop()
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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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throw;
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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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wxLogWarning(_T("Caught an int %d in MyApp."), i);
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}
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catch ( MyException& e )
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{
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wxLogWarning(_T("Caught MyException(%s) in MyApp."), e.what());
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}
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catch ( ... )
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{
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throw;
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}
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return true;
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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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// this shows how we may let some exception propagate uncaught
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try
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{
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throw;
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}
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catch ( UnhandledException& )
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{
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throw;
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}
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catch ( ... )
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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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void MyApp::OnFatalException()
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{
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wxMessageBox(_T("Program has crashed and will terminate."),
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_T("wxExcept Sample"), wxOK | wxICON_ERROR);
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}
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@ -224,8 +276,9 @@ void MyApp::OnUnhandledException()
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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, wxID_ANY, title, pos, size, style)
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MyFrame::MyFrame()
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: wxFrame(NULL, wxID_ANY, _T("Except wxWidgets App"),
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wxPoint(50, 50), wxSize(450, 340))
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{
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// set the frame icon
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SetIcon(wxICON(sample));
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@ -234,7 +287,15 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size,
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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->AppendSeparator();
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menuFile->Append(Except_ThrowInt, _T("Throw an &int\tCtrl-I"));
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menuFile->Append(Except_ThrowString, _T("Throw a &string\tCtrl-S"));
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menuFile->Append(Except_ThrowObject, _T("Throw an &object\tCtrl-O"));
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menuFile->Append(Except_ThrowUnhandled,
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_T("Throw &unhandled exception\tCtrl-U"));
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menuFile->Append(Except_Crash, _T("&Crash\tCtrl-C"));
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menuFile->AppendSeparator();
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menuFile->AppendCheckItem(Except_HandleCrash, _T("&Handle crashes\tCtrl-H"));
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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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@ -287,14 +348,41 @@ void MyFrame::OnDialog(wxCommandEvent& WXUNUSED(event))
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}
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catch ( ... )
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{
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wxLogWarning(_T("An exception in MyDialog"));
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Destroy();
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throw;
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}
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}
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void MyFrame::OnThrowInt(wxCommandEvent& WXUNUSED(event))
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{
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throw -17;
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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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throw _T("string thrown from MyFrame");
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}
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void MyFrame::OnThrowObject(wxCommandEvent& WXUNUSED(event))
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{
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throw MyException(_T("Exception thrown from MyFrame"));
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}
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void MyFrame::OnThrowUnhandled(wxCommandEvent& WXUNUSED(event))
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{
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throw UnhandledException();
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}
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void MyFrame::OnCrash(wxCommandEvent& WXUNUSED(event))
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{
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DoCrash();
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}
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void MyFrame::OnHandleCrash(wxCommandEvent& event)
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{
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wxHandleFatalExceptions(event.IsChecked());
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}
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void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
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@ -335,12 +423,11 @@ void MyDialog::OnThrowInt(wxCommandEvent& WXUNUSED(event))
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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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throw MyException(_T("Exception thrown from MyDialog"));
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}
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void MyDialog::OnCrash(wxCommandEvent& WXUNUSED(event))
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{
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char *p = 0;
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strcpy(p, "Let's crash");
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DoCrash();
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}
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