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c++ - wxWidgets: 类 wxDialog * 不能转换为类 wxApp *

问题描述

问题正是标题中的内容，我的 wxWidgets 应用程序正在崩溃，因为从对话框类到应用程序类的转换不起作用。有什么帮助吗？

错误信息：

错误 C2440：“正在初始化”：无法从“MP *”转换为“MPApp *”

错误 C2664：“void wxAppBase::SetTopWindow(wxWindow *)”：无法将参数 1 从“MPApp *”转换为“wxWindow *”

错误 C2039：“显示”：不是“MPApp”的成员

MPApp.cpp：

#include "MPApp.h"
#include "MP.h"

IMPLEMENT_APP(MPApp)

bool MPApp::OnInit()
{
    MPApp* dialog = new MP((NULL));
    SetTopWindow(dialog);
    dialog->Show(true);
    return true;
}

int MPApp::OnExit()
{
    return 0;
}

MPApp.h：

#ifndef __MPApp_h__
#define __MPApp_h__

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include <wx/wx.h>
#else
#include <wx/wxprec.h>
#endif

class MPApp : public wxApp
{
public:
    bool OnInit();
    int OnExit();
};

#endif

MP.h：

#ifndef __MP_h__
#define __MP_h__

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include <wx/wx.h>
#include <wx/dialog.h>
#else
#include <wx/wxprec.h>
#endif

#include <list>


#include <wx/menu.h>
#include <wx/timer.h>
#include <wx/listctrl.h>
#include <wx/textctrl.h>
#include <wx/stattext.h>
#include <wx/checkbox.h>
#include <wx/mediactrl.h>
#include <wx/slider.h>
#include <wx/button.h>
#include <wx/bmpbuttn.h>
#include <wx/panel.h>
#include <wx/sizer.h>
#include <wx/toplevel.h>

#undef MPSTYLE
#define MPSTYLE wxWANTS_CHARS | wxALWAYS_SHOW_SB | wxCAPTION | wxRESIZE_BORDER | wxSYSTEM_MENU  | wxDIALOG_NO_PARENT | wxMINIMIZE_BOX | wxMAXIMIZE_BOX | wxCLOSE_BOX

class MP : public wxDialog
{
private:
    DECLARE_EVENT_TABLE();
public:
    //Constuctor
    MP(wxWindow* parent, wxWindowID id = 0, const wxString& title = wxT("Music"), const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = MPSTYLE);
    virtual ~MP();
    //Player
    void PlayFileNow();
    // EVENTS
    // Command Events
    void AddToQueue(wxCommandEvent& event);
    void WxButton1Click(wxCommandEvent& event);
    void PlayButtonClick(wxCommandEvent& event);
    void NextButtonClick(wxCommandEvent& event);
    void PreviousButtonClick(wxCommandEvent& event);
    void StopButtonClick(wxCommandEvent& event);
    void RandomCheckboxClick(wxCommandEvent& event);
    void WxButton2Click(wxCommandEvent& event);
    void SavePlaylistClick(wxCommandEvent& event);
    void LoadPlaylistClick(wxCommandEvent& event);
    void AddButtonClick(wxCommandEvent& event);
    void PlaylistsButtonClick(wxCommandEvent& event);
    void FindButtonClick(wxCommandEvent& event);
    void FindTextEditEnter(wxCommandEvent& event);
    void FindNextButtonClick(wxCommandEvent& event);
    void FindPrevButtonClick(wxCommandEvent& event);
    //Media Events
    void WxMediaCtrl1MediaFinished(wxMediaEvent& event);
    void WxMediaCtrl1MediaPause(wxMediaEvent& event);
    void WxMediaCtrl1MediaPlay(wxMediaEvent& event);
    void WxMediaCtrl1MediaStop(wxMediaEvent& event);
    void WxMediaCtrl1MediaLoaded(wxMediaEvent& event);
    //Key Events
    void HotKeyNext(wxKeyEvent& event);
    void HotKeyStop(wxKeyEvent& event);
    void HotKeyPlay(wxKeyEvent& event);
    void HotKeyPrev(wxKeyEvent& event);
    //List Events
    void WxListCtrl1ColLeftClick(wxListEvent& event);
    void WxListCtrl1ColRightClick(wxListEvent& event);
    void WxListCtrl1RightClick(wxListEvent& event);
    void WxListCtrl1ItemActivated(wxListEvent& event);
    void WxListCtrl1KeyDown(wxListEvent& event);
    //UI Event
    void SavePlaylistUpdateUI0(wxUpdateUIEvent& event);
    //Scroll Events
    void WxSlider2Scroll(wxScrollEvent& event);
    void WxSlider1Scroll(wxScrollEvent& event);
    //Timer Event
    void WxTimer1Timer(wxTimerEvent& event);
    //File Event
    void MPDropFiles(wxDropFilesEvent& event);
    //Mouse Event
    void MPRightUP(wxMouseEvent& event);
private:
//GUI Control
    //Menu items
    wxMenu* PlaylistMenu;
    wxMenu* WxPopupMenu1;
    wxMenu* AddMenu;
    //Timer item
    wxTimer* WxTimer1;
    //List item
    wxListCtrl* WxListCtrl1;
    //Button items
    wxButton* FindPrevButton;
    wxButton* FindNextButton;
    wxButton* AddButton;
    wxButton* PlaylistsButton;
    wxButton* FindButton;
        //Bitmaps
    wxBitmapButton* PlayButton;
    wxBitmapButton* PreviousButton;
    wxBitmapButton* NextButton;
    //Text items
    wxTextCtrl* FindTextEdit;
    wxStaticText* WxStaticText1;
    //Slider items
    wxSlider* WxSlider2;
    wxSlider* WxSlider1;
    //Panel items
    wxPanel* SearchPanel;
    wxPanel* WxPanel1;
    wxPanel* WxPanel;
    //Check item
    wxCheckBox* RandomCheckbox;
    //Media item
    wxMediaCtrl* WxMediaCtrl1;
    //Sizer items
    wxFlexGridSizer* WxFlexGridSizer1;
    wxBoxSizer* WxBoxSizer1;
private:
    //Enum IDs for GUI
    enum
    {
        ////GUI Enum Control ID Start
        ID_MNU_LOADPLAYLIST_1028 = 1028,
        ID_MNU_SAVEPLAYLIST_1029 = 1029,

        ID_MNU_PLAY_PAUSE_1019 = 1019,
        ID_MNU_STOP_1020 = 1020,
        ID_MNU_NEXT_1021 = 1021,
        ID_MNU_PREVIOUS_1022 = 1022,
        ID_MNU_ADDFOLDER_1023 = 1023,
        ID_MNU_SAVEPLAYLIST_1024 = 1024,
        ID_MNU_LOADPLAYLIST_1025 = 1025,

        ID_MNU_ADDFILES_1026 = 1026,
        ID_MNU_ADDFOLDER_1027 = 1027,

        ID_WXTIMER1 = 1017,
        ID_WXLISTCTRL1 = 1015,
        ID_FINDPREVBUTTON = 1034,
        ID_FINDNEXTBUTTON = 1033,
        ID_FINDEDITTXT = 1044,
        ID_WXSTATICTEXT1 = 1032,
        ID_SEARCHPANEL = 1031,
        ID_FINDBUTTON = 1030,
        ID_RANDOMCHECKBOX = 1018,
        ID_WXMEDIACTRL1 = 1016,
        ID_WXSLIDER2 = 1014,
        ID_WXSLIDER1 = 1013,
        ID_ADDBUTTON = 1008,
        ID_PLAYLISTS = 1007,
        ID_NEXTBUTTON = 1006,
        ID_STOPBUTTON = 1005,
        ID_PLAYBUTTON = 1004,
        ID_PREVIOUSBUTTON = 1003,
        ID_WXPANEL2 = 1002,
        ID_WXPANEL1 = 1011,
        ////GUI Enum Control ID End
        ID_HOT_PLAY,
        ID_HOT_STOP,
        ID_HOT_NEXT,
        ID_HOT_PREV,
        ID_DUMMY_VALUE_ //don't remove this value unless you have other enum values
    };

private:
    void OnClose(wxCloseEvent& event);
    void CreateGUIControls();
protected:
    // No description
    void AddFilesFromFolder(wxString FileName);
    //FileList Dirs, Files;
    //wxTreeItemId root;
    bool isPlaying;
    long selItem;
    // No description
    void PlayThisFile(long id);
    // No description
    void PlayFromQueue();
    std::list<wxString> lastPlayed, nextPlay;
    // No description
    void PlayNextFile();
    void DeselectAllFiles();

};

#endif

由于文件的长度，我无法包含 MP.cpp，但它编译得很好，而且我已经调试了这些问题。

标签： c++c++11pointerswxwidgets

解决方案

为什么你会期待这条线：

    MPApp* dialog = new MP((NULL));

去工作？你MP是一个wxDialog，即一种顶级窗口。它根本不是一回事MPApp，它是一种应用程序对象。

也许这只是一个错字，你真的想写

    MP* dialog = new MP((NULL));

但如果不是，你真的应该问问自己你想在这里实现什么。

此外，切线地，像您在此处那样使用非模态对话框是非常不寻常的（模态对话框将显示为ShowModal()，而不仅仅是Show()，并在堆栈而不是堆上创建）。wxFrame对于普通的非模态窗口来说，几乎总是一个更好的选择。

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