wxWidgets and event handling
in [wxWindows]
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From: Fibre Optic on 24 Oct 2006 11:24 Hello, I have problem with event handling... I have defined MyFrame class, besides number of different members it has the following two: MyListCtrl* navigation; wxNotebook* notebook; All I wanted to do is change status of object i.e. 'notebook' from event handler of different i.e. 'navigation'. I have defined event handler method 'MyFrame::OnSelectedT' of 'navigation' to deal with 'notebook' by pointer. It compiles without warnings, the app starts but when I click on items of 'navigation' the app printes "!!! SELECTED !!!" (wqhich is ok)then it generates stack trace :-( : wxDivingLogBook.exe caused an Access Violation at location 00403d61 in module wxDivingLogBook.exe Reading from location 454c4553. Registers: eax=454c4553 ebx=00257f58 ecx=7c810e16 edx=00275db8 esi=006590d0 edi=0023ef4c eip=00403d61 esp=0023eb2c ebp=0023eb34 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202 Call stack: 00403D61 wxDivingLogBook.exe:00403D61 MyFrame::OnSelectedT(wxListEvent&) MyFrame.cpp:207 ... printf("!!! SELECTED !!!\n"); > notebook->SetSelection(2); .... .... Could some one of you explain me where is problem and how to improve the code? bool MyApp::OnInit() { .... .... MyFrame *frame = new MyFrame(0, wxID_ANY, wxT("wxDivingLogBook v0.1"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE); // Show it frame->Show(true); .... .... } //******************************************************************* class MyFrame : public wxFrame { public: // Constructors MyFrame(const wxString& title); MyFrame(wxWindow* parent, int id, const wxString& title, const wxPoint& pos=wxDefaultPosition, const wxSize& size=wxDefaultSize, long style=wxDEFAULT_FRAME_STYLE); //Destructor virtual ~MyFrame(); // Creation bool Create(); // Event handlers of MyListCtrl class void OnSelectedT(wxListEvent& event); // setters & getters .... .... private: // This class handles events DECLARE_EVENT_TABLE() //Widgets MyListCtrl* navigation; wxNotebook* notebook; .... .... }; .... .... //*************************************************************** void MyFrame::OnSelectedT(wxListEvent& event) { printf("!!! SELECTED !!!\n"); notebook->SetSelection(2); } // Event table for MyListCtrl BEGIN_EVENT_TABLE(MyListCtrl, wxListCtrl) EVT_LIST_ITEM_SELECTED(LIST_CTRL, MyFrame::OnSelectedT) END_EVENT_TABLE() Regards, Fibre Optic
From: Thomas Zehbe on 24 Oct 2006 11:39 Am Dienstag, 24. Oktober 2006 17:24 schrieb Fibre Optic: > Hello, > > I have problem with event handling... I have defined MyFrame class, > besides number of different members it has the following two: > > MyListCtrl* navigation; > wxNotebook* notebook; > > > All I wanted to do is change status of object i.e. 'notebook' from event > handler of different i.e. 'navigation'. I have defined event handler > method 'MyFrame::OnSelectedT' of 'navigation' to deal with 'notebook' by > pointer. It compiles without warnings, the app starts but when I click > on items of 'navigation' the app printes "!!! SELECTED !!!" (wqhich is > ok)then it generates stack trace :-( : > > wxDivingLogBook.exe caused an Access Violation at location 00403d61 in > module wxDivingLogBook.exe Reading from location 454c4553. > > Registers: > eax=454c4553 ebx=00257f58 ecx=7c810e16 edx=00275db8 esi=006590d0 > edi=0023ef4c > eip=00403d61 esp=0023eb2c ebp=0023eb34 iopl=0 nv up ei pl nz na > pe nc > cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 > efl=00000202 > > Call stack: > 00403D61 wxDivingLogBook.exe:00403D61 > MyFrame::OnSelectedT(wxListEvent&) MyFrame.cpp:207 What is in line 207 of MyFrame? Have you started it in the debugger to get a callstack or backtrace? Regards, Thomas > ... > > printf("!!! SELECTED !!!\n"); > > > notebook->SetSelection(2); > > ... > ... > > > > > > > Could some one of you explain me where is problem and how to improve the > code? > > > bool MyApp::OnInit() > { > ... > ... > MyFrame *frame = new MyFrame(0, > wxID_ANY, > wxT("wxDivingLogBook v0.1"), > wxDefaultPosition, > wxDefaultSize, > wxDEFAULT_FRAME_STYLE); > > // Show it > frame->Show(true); > ... > ... > } > > //******************************************************************* > > class MyFrame : public wxFrame > { > public: > > // Constructors > MyFrame(const wxString& title); > MyFrame(wxWindow* parent, int id, const wxString& title, > const wxPoint& pos=wxDefaultPosition, > const wxSize& size=wxDefaultSize, > long style=wxDEFAULT_FRAME_STYLE); > > //Destructor > virtual ~MyFrame(); > > // Creation > bool Create(); > > // Event handlers of MyListCtrl class > void OnSelectedT(wxListEvent& event); > > > // setters & getters > ... > ... > > private: > // This class handles events > DECLARE_EVENT_TABLE() > > //Widgets > MyListCtrl* navigation; > wxNotebook* notebook; > ... > ... > }; > > ... > ... > > //*************************************************************** > > void MyFrame::OnSelectedT(wxListEvent& event) > { > > printf("!!! SELECTED !!!\n"); > > notebook->SetSelection(2); > > } > > > // Event table for MyListCtrl > BEGIN_EVENT_TABLE(MyListCtrl, wxListCtrl) > EVT_LIST_ITEM_SELECTED(LIST_CTRL, MyFrame::OnSelectedT) > END_EVENT_TABLE() > > > Regards, > Fibre Optic > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: wx-users-unsubscribe(a)lists.wxwidgets.org > For additional commands, e-mail: wx-users-help(a)lists.wxwidgets.org -- Dipl.-Ing. Thomas Zehbe INGENION GmbH Kuhweide 6 31552 Apelern Fon: 05043 / 40 57 90 4 Fax: 05043 / 40 57 90 7 --------------------------------------------------------------------- To unsubscribe, e-mail: wx-users-unsubscribe(a)lists.wxwidgets.org For additional commands, e-mail: wx-users-help(a)lists.wxwidgets.org
From: Fibre Optic on 25 Oct 2006 04:54 Thomas Zehbe wrote: > > What is in line 207 of MyFrame? > Have you started it in the debugger to get a callstack or backtrace? > In line207 of MyFrame I have the following: notebook->SetSelection(2); Why it crashed down when I try to call the SetSelection() method of notebook? Basically, it looks like I can not call it even it compiles without problem. I have tried to call different methods but result is still the same. Best Regards, Fibre Optic
From: Thomas Zehbe on 25 Oct 2006 05:19 Am Mittwoch, 25. Oktober 2006 10:54 schrieb Fibre Optic: > Thomas Zehbe wrote: > > What is in line 207 of MyFrame? > > Have you started it in the debugger to get a callstack or backtrace? > > In line207 of MyFrame I have the following: > notebook->SetSelection(2); > > Why it crashed down when I try to call the SetSelection() method of > notebook? Basically, it looks like I can not call it even it compiles > without problem. I have tried to call different methods but result is > still the same. How many tabs has the notebook? If there are only 2, you would try to select the third, which doesn't exist. Is notebook a valid pointer in this context? Does it point to a notebook? Is the crash gone if you comment the line out? Are there event functions OnSelect in the notebook? Does it crash, if you do a "notebook->SetSelection(2);" in another part of the program? All these could be usefull to isolate the error. Hope it helps. Regards, Thomas > > Best Regards, > Fibre Optic > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: wx-users-unsubscribe(a)lists.wxwidgets.org > For additional commands, e-mail: wx-users-help(a)lists.wxwidgets.org -- Dipl.-Ing. Thomas Zehbe INGENION GmbH Kuhweide 6 31552 Apelern Fon: 05043 / 40 57 90 4 Fax: 05043 / 40 57 90 7 --------------------------------------------------------------------- To unsubscribe, e-mail: wx-users-unsubscribe(a)lists.wxwidgets.org For additional commands, e-mail: wx-users-help(a)lists.wxwidgets.org
From: Fibre Optic on 25 Oct 2006 05:33
Thomas Zehbe wrote: > How many tabs has the notebook? If there are only 2, you would try to select > the third, which doesn't exist. the notebook has 6 tabs > Is notebook a valid pointer in this context? Does it point to a notebook? i think it is valid pointer, at list > Is the crash gone if you comment the line out? yes! > Are there event functions OnSelect in the notebook? I have prepared only the following event handler: // Event table for MyListCtrl BEGIN_EVENT_TABLE(MyListCtrl, wxListCtrl) EVT_LIST_ITEM_SELECTED(LIST_CTRL, MyFrame::OnSelectedT) END_EVENT_TABLE() IOs it ok that OnSelectedT method is member of MyFrame? > Does it crash, if you do a "notebook->SetSelection(2);" in another part of the > program? I have added the line in to body of MyFrame::OnAbout it works perfectly !!! > > All these could be usefull to isolate the error. > Hope it helps. Any ideas ? Regards, Fibre Optic |