stackoom
  简体   繁体   中英

Why is wxWidgets erring out when I follow the instructions?

 原文  2022-12-27 05:40:40  2   1    c++/ codeblocks/ wxwidgets

Question

I am following the Hello World tutorial for WxSmith using CodeBlocks 20.03 and wxWidgets 3.1 in Ubuntu 20.04. This is later confirmed to also happen in Windows 10 using the same CodeBlocks and wxWidgets. I have it working up to this point:

Search for border size and change it from 5 to 0.

So far, the Resource view is as follows:

在此处输入图像描述

Moving on:

Since we will also use sizers to manage items added into wxPanel, we have to repeat the addition of wxBoxSize into wxPanel. After the sizer is in its place, switch back into the Standard tab on the palette and add a wxStaticText control.

What I understand is that I have to add another wxBoxsizer into the wxPanel object, and put a wxStaticText object into it. I then build the code using the gear button, which gives no error. Then I run it with the play button, and it throws an error:

图片

I would like to ask what I have done wrong. This video doesn't have the outer wxBoxSizer and it works.

img3

I would like to ask what I have done wrong, and how I can make it work according to the tutorial?

Further scouring the web shows someone running into this exact problem more than 9 years ago here . This is failing code from me:

/***************************************************************
 * Name:      testMain.cpp
 * Purpose:   Code for Application Frame
 * Author:     ()
 * Created:   2022-12-27
 * Copyright:  ()
 * License:
 **************************************************************/

#include "wx_pch.h"
#include "testMain.h"
#include <wx/msgdlg.h>

//(*InternalHeaders(testFrame)
#include <wx/intl.h>
#include <wx/string.h>
//*)

//helper functions
enum wxbuildinfoformat {
    short_f, long_f };

wxString wxbuildinfo(wxbuildinfoformat format)
{
    wxString wxbuild(wxVERSION_STRING);

    if (format == long_f )
    {
#if defined(__WXMSW__)
        wxbuild << _T("-Windows");
#elif defined(__UNIX__)
        wxbuild << _T("-Linux");
#endif

#if wxUSE_UNICODE
        wxbuild << _T("-Unicode build");
#else
        wxbuild << _T("-ANSI build");
#endif // wxUSE_UNICODE
    }

    return wxbuild;
}

//(*IdInit(testFrame)
const long testFrame::ID_STATICTEXT1 = wxNewId();
const long testFrame::ID_BUTTON1 = wxNewId();
const long testFrame::ID_PANEL1 = wxNewId();
const long testFrame::idMenuQuit = wxNewId();
const long testFrame::idMenuAbout = wxNewId();
const long testFrame::ID_STATUSBAR1 = wxNewId();
//*)

BEGIN_EVENT_TABLE(testFrame,wxFrame)
    //(*EventTable(testFrame)
    //*)
END_EVENT_TABLE()

testFrame::testFrame(wxWindow* parent,wxWindowID id)
{
    //(*Initialize(testFrame)
    wxBoxSizer* BoxSizer1;
    wxBoxSizer* BoxSizer2;
    wxMenu* Menu1;
    wxMenu* Menu2;
    wxMenuBar* MenuBar1;
    wxMenuItem* MenuItem1;
    wxMenuItem* MenuItem2;

    Create(parent, id, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE, _T("id"));
    BoxSizer1 = new wxBoxSizer(wxHORIZONTAL);
    Panel1 = new wxPanel(this, ID_PANEL1, wxDefaultPosition, wxSize(960,320), wxTAB_TRAVERSAL, _T("ID_PANEL1"));
    BoxSizer2 = new wxBoxSizer(wxHORIZONTAL);
    StaticText1 = new wxStaticText(Panel1, ID_STATICTEXT1, _("Label"), wxDefaultPosition, wxSize(120,60), 0, _T("ID_STATICTEXT1"));
    BoxSizer2->Add(StaticText1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    Button1 = new wxButton(Panel1, ID_BUTTON1, _("Label"), wxDefaultPosition, wxDefaultSize, 0, wxDefaultValidator, _T("ID_BUTTON1"));
    BoxSizer2->Add(Button1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    Panel1->SetSizer(BoxSizer2);
    SetSizer(BoxSizer2);
    Layout();
    BoxSizer1->Add(Panel1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    SetSizer(BoxSizer1);
    MenuBar1 = new wxMenuBar();
    Menu1 = new wxMenu();
    MenuItem1 = new wxMenuItem(Menu1, idMenuQuit, _("Quit\tAlt-F4"), _("Quit the application"), wxITEM_NORMAL);
    Menu1->Append(MenuItem1);
    MenuBar1->Append(Menu1, _("&File"));
    Menu2 = new wxMenu();
    MenuItem2 = new wxMenuItem(Menu2, idMenuAbout, _("About\tF1"), _("Show info about this application"), wxITEM_NORMAL);
    Menu2->Append(MenuItem2);
    MenuBar1->Append(Menu2, _("Help"));
    SetMenuBar(MenuBar1);
    StatusBar1 = new wxStatusBar(this, ID_STATUSBAR1, 0, _T("ID_STATUSBAR1"));
    int __wxStatusBarWidths_1[1] = { -1 };
    int __wxStatusBarStyles_1[1] = { wxSB_NORMAL };
    StatusBar1->SetFieldsCount(1,__wxStatusBarWidths_1);
    StatusBar1->SetStatusStyles(1,__wxStatusBarStyles_1);
    SetStatusBar(StatusBar1);
    BoxSizer1->Fit(this);
    BoxSizer1->SetSizeHints(this);

    Connect(idMenuQuit,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&testFrame::OnQuit);
    Connect(idMenuAbout,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&testFrame::OnAbout);
    //*)
}

testFrame::~testFrame()
{
    //(*Destroy(testFrame)
    //*)
}

void testFrame::OnQuit(wxCommandEvent& event)
{
    Close();
}

void testFrame::OnAbout(wxCommandEvent& event)
{
    wxString msg = wxbuildinfo(long_f);
    wxMessageBox(msg, _("Welcome to..."));
}

And this is the working code from that link:

#include "wx_pch.h"
#include "testMain.h"
#include <wx/msgdlg.h>

//(*InternalHeaders(testFrame)
#include <wx/intl.h>
#include <wx/string.h>
//*)

//helper functions
enum wxbuildinfoformat {
    short_f, long_f };

wxString wxbuildinfo(wxbuildinfoformat format)
{
    wxString wxbuild(wxVERSION_STRING);

    if (format == long_f )
    {
#if defined(__WXMSW__)
        wxbuild << _T("-Windows");
#elif defined(__UNIX__)
        wxbuild << _T("-Linux");
#endif

#if wxUSE_UNICODE
        wxbuild << _T("-Unicode build");
#else
        wxbuild << _T("-ANSI build");
#endif // wxUSE_UNICODE
    }

    return wxbuild;
}

//(*IdInit(testFrame)
const long testFrame::ID_STATICTEXT1 = wxNewId();
const long testFrame::ID_BUTTON1 = wxNewId();
const long testFrame::ID_PANEL1 = wxNewId();
const long testFrame::idMenuQuit = wxNewId();
const long testFrame::idMenuAbout = wxNewId();
const long testFrame::ID_STATUSBAR1 = wxNewId();
//*)

BEGIN_EVENT_TABLE(testFrame,wxFrame)
    //(*EventTable(testFrame)
    //*)
END_EVENT_TABLE()

testFrame::testFrame(wxWindow* parent,wxWindowID id)
{
    //(*Initialize(testFrame)
    wxBoxSizer* BoxSizer1;
    wxBoxSizer* BoxSizer2;
    wxMenu* Menu1;
    wxMenu* Menu2;
    wxMenuBar* MenuBar1;
    wxMenuItem* MenuItem1;
    wxMenuItem* MenuItem2;

    Create(parent, id, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE, _T("id"));
    SetClientSize(wxSize(491,450));
    BoxSizer1 = new wxBoxSizer(wxHORIZONTAL);
    Panel1 = new wxPanel(this, ID_PANEL1, wxDefaultPosition, wxDefaultSize, wxTAB_TRAVERSAL, _T("ID_PANEL1"));
    BoxSizer2 = new wxBoxSizer(wxHORIZONTAL);
    StaticText1 = new wxStaticText(Panel1, ID_STATICTEXT1, _("Label"), wxDefaultPosition, wxDefaultSize, 0, _T("ID_STATICTEXT1"));
    BoxSizer2->Add(StaticText1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    Button1 = new wxButton(Panel1, ID_BUTTON1, _("Label"), wxDefaultPosition, wxDefaultSize, 0, wxDefaultValidator, _T("ID_BUTTON1"));
    BoxSizer2->Add(Button1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    Panel1->SetSizer(BoxSizer2);
    BoxSizer2->Fit(Panel1);
    BoxSizer2->SetSizeHints(Panel1);
    BoxSizer1->Add(Panel1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    SetSizer(BoxSizer1);
    MenuBar1 = new wxMenuBar();
    Menu1 = new wxMenu();
    MenuItem1 = new wxMenuItem(Menu1, idMenuQuit, _("Quit\tAlt-F4"), _("Quit the application"), wxITEM_NORMAL);
    Menu1->Append(MenuItem1);
    MenuBar1->Append(Menu1, _("&File"));
    Menu2 = new wxMenu();
    MenuItem2 = new wxMenuItem(Menu2, idMenuAbout, _("About\tF1"), _("Show info about this application"), wxITEM_NORMAL);
    Menu2->Append(MenuItem2);
    MenuBar1->Append(Menu2, _("Help"));
    SetMenuBar(MenuBar1);
    StatusBar1 = new wxStatusBar(this, ID_STATUSBAR1, 0, _T("ID_STATUSBAR1"));
    int __wxStatusBarWidths_1[1] = { -1 };
    int __wxStatusBarStyles_1[1] = { wxSB_NORMAL };
    StatusBar1->SetFieldsCount(1,__wxStatusBarWidths_1);
    StatusBar1->SetStatusStyles(1,__wxStatusBarStyles_1);
    SetStatusBar(StatusBar1);
    SetSizer(BoxSizer1);
    Layout();

    Connect(idMenuQuit,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&testFrame::OnQuit);
    Connect(idMenuAbout,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&testFrame::OnAbout);
    //*)
}

testFrame::~testFrame()
{
    //(*Destroy(testFrame)
    //*)
}

void testFrame::OnQuit(wxCommandEvent& event)
{
    Close();
}

void testFrame::OnAbout(wxCommandEvent& event)
{
    wxString msg = wxbuildinfo(long_f);
    wxMessageBox(msg, _("Welcome to..."));
}

Comparing the two, the root of the problem is from these 4 lines (working code on the right):

img4

The code works after commenting out the 4 lines on the left, and copying the ones on the right over. Now it appears that these lines set the relationships between elements. Could someone explain to me what they mean (right and wrong), and what I can do to get the correct ones generated? I followed the instructions the best I can, and apparently something was not done right. The working code has THE SAME graphical layout as mine. Only the generated code is different in crucial places. I couldn't find any more detailed video or instructions that could help getting it right in the first place.

1 answers

solution1
 0  2022-12-27 15:36:40

Please read the error message you got. It contains both the description of the problem and even the advice about how to fix it, but it looks like you simply overlooked it entirely.

Assert error messages like this one are there to help you, but they can't do it if you simply ignore them without reading.

solution2
 0  2022-12-29 05:05:01

After adding the first swBoxSizer and the wxPanel , this is what is shown in the preview window:

图片

The tiny object induces me to set the size to the wxPanel object to make it visible and easy to work on. However this triggers a change in the generated code. The panel's size is no longer wxDefaultSize but wxSize(960,320) as seen in the failing code above. In order to avoid this, I must use the tool Insert new widgets into current selection which looks like this:

图片

After that, another swBoxSizer and swStaticText are added sequentially. swButton is added last using the original Insert new widget by pointing with mouse tool.

图片

This is the working code that is generated:

#include "wx_pch.h"
#include "testMain.h"
#include <wx/msgdlg.h>

//(*InternalHeaders(testFrame)
#include <wx/intl.h>
#include <wx/string.h>
//*)

//helper functions
enum wxbuildinfoformat {
    short_f, long_f };

wxString wxbuildinfo(wxbuildinfoformat format)
{
    wxString wxbuild(wxVERSION_STRING);

    if (format == long_f )
    {
#if defined(__WXMSW__)
        wxbuild << _T("-Windows");
#elif defined(__UNIX__)
        wxbuild << _T("-Linux");
#endif

#if wxUSE_UNICODE
        wxbuild << _T("-Unicode build");
#else
        wxbuild << _T("-ANSI build");
#endif // wxUSE_UNICODE
    }

    return wxbuild;
}

//(*IdInit(testFrame)
const long testFrame::ID_STATICTEXT1 = wxNewId();
const long testFrame::ID_BUTTON1 = wxNewId();
const long testFrame::ID_PANEL1 = wxNewId();
const long testFrame::idMenuQuit = wxNewId();
const long testFrame::idMenuAbout = wxNewId();
const long testFrame::ID_STATUSBAR1 = wxNewId();
//*)

BEGIN_EVENT_TABLE(testFrame,wxFrame)
    //(*EventTable(testFrame)
    //*)
END_EVENT_TABLE()

testFrame::testFrame(wxWindow* parent,wxWindowID id)
{
    //(*Initialize(testFrame)
    wxBoxSizer* BoxSizer1;
    wxBoxSizer* BoxSizer2;
    wxMenu* Menu1;
    wxMenu* Menu2;
    wxMenuBar* MenuBar1;
    wxMenuItem* MenuItem1;
    wxMenuItem* MenuItem2;

    Create(parent, id, wxEmptyString, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE, _T("id"));
    BoxSizer1 = new wxBoxSizer(wxHORIZONTAL);
    Panel1 = new wxPanel(this, ID_PANEL1, wxDefaultPosition, wxDefaultSize, wxTAB_TRAVERSAL, _T("ID_PANEL1"));
    BoxSizer2 = new wxBoxSizer(wxHORIZONTAL);
    StaticText1 = new wxStaticText(Panel1, ID_STATICTEXT1, _("Label"), wxDefaultPosition, wxDefaultSize, 0, _T("ID_STATICTEXT1"));
    BoxSizer2->Add(StaticText1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    Button1 = new wxButton(Panel1, ID_BUTTON1, _("Label"), wxDefaultPosition, wxDefaultSize, 0, wxDefaultValidator, _T("ID_BUTTON1"));
    BoxSizer2->Add(Button1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    Panel1->SetSizer(BoxSizer2);
    BoxSizer2->Fit(Panel1);
    BoxSizer2->SetSizeHints(Panel1);
    BoxSizer1->Add(Panel1, 1, wxALL|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    SetSizer(BoxSizer1);
    MenuBar1 = new wxMenuBar();
    Menu1 = new wxMenu();
    MenuItem1 = new wxMenuItem(Menu1, idMenuQuit, _("Quit\tAlt-F4"), _("Quit the application"), wxITEM_NORMAL);
    Menu1->Append(MenuItem1);
    MenuBar1->Append(Menu1, _("&File"));
    Menu2 = new wxMenu();
    MenuItem2 = new wxMenuItem(Menu2, idMenuAbout, _("About\tF1"), _("Show info about this application"), wxITEM_NORMAL);
    Menu2->Append(MenuItem2);
    MenuBar1->Append(Menu2, _("Help"));
    SetMenuBar(MenuBar1);
    StatusBar1 = new wxStatusBar(this, ID_STATUSBAR1, 0, _T("ID_STATUSBAR1"));
    int __wxStatusBarWidths_1[1] = { -1 };
    int __wxStatusBarStyles_1[1] = { wxSB_NORMAL };
    StatusBar1->SetFieldsCount(1,__wxStatusBarWidths_1);
    StatusBar1->SetStatusStyles(1,__wxStatusBarStyles_1);
    SetStatusBar(StatusBar1);
    BoxSizer1->Fit(this);
    BoxSizer1->SetSizeHints(this);

    Connect(idMenuQuit,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&testFrame::OnQuit);
    Connect(idMenuAbout,wxEVT_COMMAND_MENU_SELECTED,(wxObjectEventFunction)&testFrame::OnAbout);
    //*)
}

testFrame::~testFrame()
{
    //(*Destroy(testFrame)
    //*)
}

void testFrame::OnQuit(wxCommandEvent& event)
{
    Close();
}

void testFrame::OnAbout(wxCommandEvent& event)
{
    wxString msg = wxbuildinfo(long_f);
    wxMessageBox(msg, _("Welcome to..."));
}

This is a pitfall that can discourage beginners trying to learn the framework. I hope this will help anybody who finds this post.

暂无
暂无

The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.

Related Question Errors when compiling wxWidgets why changing edior font in codeblocks 20.03 is showing wxWidgets debug alert? How do I keep polling HIDAPI in wxWidgets? Why won't wxWidgets work with Code::Blocks + minGW? wxwidgets listctrl can't see title when using wxsmith in codeblocks wxWidgets with Codeblocks setup creating squares and rectangles in wxwidgets CodeBlocks not finding wxWidgets Linux C++ wxWidgets giving segmentation fault when clicking multiple wxButtons I have just made my first wxwidgets project in codeblocks, I want an application that just runs my GUI directly. Kindly Help Me
Related Tags
 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM