c++ - 链接从 wxDialog 继承的类时出错

Question

我写了一个继承自wxDialog的类。我目前在 Ubuntu 12.04 上，使用 Code::Blocks 和 gcc 4.6。在我将此类包含在项目中之前，我的应用程序工作正常:调试和发布配置给出相同的错误。这是代码:

头文件

#ifndef EBCDIALOG_H
#define EBCDIALOG_H

#include <wx/dialog.h>
#include <wx/sizer.h>
#include <wx/textctrl.h>
#include <wx/button.h>

class EBCDialog : public wxDialog
{
    public:

        EBCDialog(wxWindow* parent, wxWindowID id, const wxString& title );
        ~EBCDialog();

        void OnOK(wxCommandEvent& event);
    private:

       DECLARE_CLASS(EBCDialog)
        DECLARE_EVENT_TABLE()
};

#endif //EBCDIALOG_H

Cpp文件:

#include "EBCDialog.h"

EBCDialog::EBCDialog(wxWindow* parent, wxWindowID id, const wxString& title ) : wxDialog(parent, id, title, wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE | wxRESIZE_BORDER)
{
    wxBoxSizer* topSizer = new wxBoxSizer(wxVERTICAL);
    // Create text ctrl with minimal size 100x60
    topSizer->Add(new wxTextCtrl(this, wxID_ANY, wxT("test"), wxDefaultPosition, wxSize(100,60)),
        1,  // make vertically stretchable
        wxEXPAND|   // make horizontally stretchable
        wxALL,      // and make border all around
        10);        // set border width to 10

    wxBoxSizer* buttonSizer = new wxBoxSizer( wxHORIZONTAL );
    buttonSizer->Add(new wxButton(this, wxID_OK, _T("OK")),
        0,  // make horizontally unstretchable
        wxALL,  // make border all around: implicit top alignment
        10);   // set border width to 10

    buttonSizer->Add(new wxButton(this, wxID_CANCEL, _T("Cancel")),
        0,  // make horizontally unstretchable
        wxALL,  // make border all around (implicit top alignment)
        10);   // set border width to 10

    topSizer->Add(buttonSizer,
    0,  // make vertically unstretchable
    wxALIGN_CENTER ); // no border and centre horizontally

    SetSizer( topSizer ); // use the sizer for layout
    topSizer->Fit( this );

    // fit the dialog to the contents
    topSizer->SetSizeHints( this ); // set hints to honor min size
}

EBCDialog::~EBCDialog()
{

}

void EBCDialog::OnOK(wxCommandEvent& event)
{

}

BEGIN_EVENT_TABLE(EBCDialog, wxDialog)
    EVT_BUTTON(wxID_OK, EBCDialog::OnOK)
END_EVENT_TABLE()

这是代码:: block 日志:

g++ -Wall -I/usr/lib/i386-linux-gnu/wx/include/gtk2-unicode-debug-2.8 -I/usr/include/wx-2.8 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -D_WXDEBUG_ -D_WXGTK_ -pthread -O2 -I"/home/angelo/CodeBlocks/Event Bus Configurer/include" -I"/home/angelo/CodeBlocks/Event Bus Configurer/bitmaps" -c "/home/angelo/CodeBlocks/Event Bus Configurer/src/EBCDialog.cpp" -o obj/src/EBCDialog.o g++ -o "bin/Event Bus Configurer" obj/src/EBCApp.o obj/src/EBCDialog.o obj/src/EBCFrame.o obj/src/EBCList.o obj/src/HandlerFile.o -L/usr/lib/i386-linux-gnu -pthread -Wl,-Bsymbolic-functions -Wl,-z,relro -L/usr/lib/i386-linux-gnu -lwx_gtk2ud_richtext-2.8 -lwx_gtk2ud_aui-2.8 -lwx_gtk2ud_xrc-2.8 -lwx_gtk2ud_qa-2.8 -lwx_gtk2ud_html-2.8 -lwx_gtk2ud_adv-2.8 -lwx_gtk2ud_core-2.8 -lwx_baseud_xml-2.8 -lwx_baseud_net-2.8 -lwx_baseud-2.8 -s obj/src/EBCDialog.o:(.rodata._ZTV9EBCDialog[vtable for EBCDialog]+0x8): undefined reference to `EBCDialog::GetClassInfo() const' collect2: ld returned 1 exit status Process terminated with status 1 (0 minutes, 2 seconds) 1 errors, 0 warnings

感谢任何帮助，谢谢!

Answer 1

从您的代码中删除 DECLARE_CLASS(EBCDialog)，基类 wxDialog 已经为您完成了。

来自documentation :

wxWidgets uses its own RTTI ("run-time type identification") system which predates the current standard C++ RTTI and so is kept for backwards compatibility reasons but also because it allows some things which the standard RTTI doesn't directly support (such as creating a class from its name).

The standard C++ RTTI can be used in the user code without any problems and in general you shouldn't need to use the functions and the macros in this section unless you are thinking of modifying or adding any wxWidgets classes.