C2011 «CMemD C»: переопределение типа «класс» в Visual Studio 2019 - PullRequest
0 голосов
/ 21 января 2020

Прежде всего, я хотел бы, чтобы вы знали, что код, который я использую, - это те же коды, которые можно найти в GitHub. Во-вторых, я пробовал различные решения в Интернете, такие как установка блоков заголовков или размещение #pragma once поверх файла cpp, но все равно выдает те же ошибки, которые будут упомянуты ниже.

Что меня смущает Вот как этот код находится в различных репозиториях, но я не могу собрать его с использованием VS 2019.

Я предполагаю, что мне нужно установить VS 2010 для правильной сборки, но я рассматриваю его как последнее средство для решения этой проблемы.

Любые идеи будут с благодарностью. Спасибо.

TextProgressCtrl. cpp

// TextProgressCtrl.cpp : implementation file
//
// Written by Chris Maunder (chrismaunder@codeguru.com)
// Copyright 1998.
//
// Modified : 26/05/98 Jeremy Davis, jmd@jvf.co.uk
//              Added colour routines
//
// TextProgressCtrl is a drop-in replacement for the standard 
// CProgressCtrl that displays text in a progress control.
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed by any means PROVIDING it is not sold for
// profit without the authors written consent, and providing that this
// notice and the authors name is included. If the source code in 
// this file is used in any commercial application then an email to
// the me would be nice.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability if it causes any damage to your
// computer, causes your pet cat to fall ill, increases baldness or
// makes you car start emitting strange noises when you start it up.
//
// Expect bugs.
// 
// Please use and enjoy. Please let me know of any bugs/mods/improvements 
// that you have found/implemented and I will fix/incorporate them into this
// file. 
#ifndef _MEMDC_H_        // changed location from original code
#define _MEMDC_H_        // added for header blocks
#include "stdAfx.h"
#include "TextProgressCtrl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif



//////////////////////////////////////////////////
// CMemDC - memory DC
//
// Author: Keith Rule
// Email:  keithr@europa.com
// Copyright 1996-1997, Keith Rule
//
// You may freely use or modify this code provided this
// Copyright is included in all derived versions.
//
// History - 10/3/97 Fixed scrolling bug.
//                   Added print support.
//
// This class implements a memory Device Context

class CMemDC : public CDC
{
public:

    // constructor sets up the memory DC
    CMemDC(CDC* pDC) : CDC()
    {
        ASSERT(pDC != NULL);

        m_pDC = pDC;
        m_pOldBitmap = NULL;
        m_bMemDC = !pDC->IsPrinting();

        if (m_bMemDC)    // Create a Memory DC
        {
            pDC->GetClipBox(&m_rect);
            CreateCompatibleDC(pDC);
            m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
            m_pOldBitmap = SelectObject(&m_bitmap);
            SetWindowOrg(m_rect.left, m_rect.top);
        }
        else        // Make a copy of the relevent parts of the current DC for printing
        {
            m_bPrinting = pDC->m_bPrinting;
            m_hDC = pDC->m_hDC;
            m_hAttribDC = pDC->m_hAttribDC;
        }
    }

    // Destructor copies the contents of the mem DC to the original DC
    ~CMemDC()
    {
        if (m_bMemDC)
        {
            // Copy the offscreen bitmap onto the screen.
            m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
                this, m_rect.left, m_rect.top, SRCCOPY);

            //Swap back the original bitmap.
            SelectObject(m_pOldBitmap);
        }
        else {
            // All we need to do is replace the DC with an illegal value,
            // this keeps us from accidently deleting the handles associated with
            // the CDC that was passed to the constructor.
            m_hDC = m_hAttribDC = NULL;
        }
    }

    // Allow usage as a pointer
    CMemDC* operator->() { return this; }

    // Allow usage as a pointer
    operator CMemDC* () { return this; }

private:
    CBitmap  m_bitmap;      // Offscreen bitmap
    CBitmap* m_pOldBitmap;  // bitmap originally found in CMemDC
    CDC* m_pDC;         // Saves CDC passed in constructor
    CRect    m_rect;        // Rectangle of drawing area.
    BOOL     m_bMemDC;      // TRUE if CDC really is a Memory DC.
};

#endif



/////////////////////////////////////////////////////////////////////////////
// CTextProgressCtrl

CTextProgressCtrl::CTextProgressCtrl()
{
    m_nPos = 0;
    m_nStepSize = 1;
    m_nMax = 100;
    m_nMin = 0;
    m_bShowText = TRUE;
    m_strText.Empty();
    m_colFore = ::GetSysColor(COLOR_HIGHLIGHT);
    m_colBk = ::GetSysColor(COLOR_WINDOW);
    m_colTextFore = ::GetSysColor(COLOR_HIGHLIGHT);
    m_colTextBk = ::GetSysColor(COLOR_WINDOW);

    m_nBarWidth = -1;
}

CTextProgressCtrl::~CTextProgressCtrl()
{
}

BEGIN_MESSAGE_MAP(CTextProgressCtrl, CProgressCtrl)
    //{{AFX_MSG_MAP(CTextProgressCtrl)
    ON_WM_ERASEBKGND()
    ON_WM_PAINT()
    ON_WM_SIZE()
    //}}AFX_MSG_MAP
    ON_MESSAGE(WM_SETTEXT, OnSetText)
    ON_MESSAGE(WM_GETTEXT, OnGetText)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTextProgressCtrl message handlers

LRESULT CTextProgressCtrl::OnSetText(WPARAM wParam, LPARAM lParam)
{
    LPCTSTR szText = (LPCTSTR)lParam;
    LRESULT result = Default();

    if ((!szText && m_strText.GetLength()) ||
        (szText && (m_strText != szText)))
    {
        m_strText = szText;
        Invalidate();
    }

    return result;
}

LRESULT CTextProgressCtrl::OnGetText(WPARAM cchTextMax, LPARAM szText)
{
    if (!_tcsncpy((LPTSTR)szText, m_strText, cchTextMax))
        return 0;
    else
        return min(cchTextMax, (UINT)m_strText.GetLength());
}

BOOL CTextProgressCtrl::OnEraseBkgnd(CDC* /*pDC*/)
{
    return TRUE;
}

void CTextProgressCtrl::OnSize(UINT nType, int cx, int cy)
{
    CProgressCtrl::OnSize(nType, cx, cy);

    m_nBarWidth = -1;   // Force update if SetPos called
}

void CTextProgressCtrl::OnPaint()
{
    if (m_nMin >= m_nMax)
        return;

    CRect LeftRect, RightRect, ClientRect;
    GetClientRect(ClientRect);

    double Fraction = (double)(m_nPos - m_nMin) / ((double)(m_nMax - m_nMin));

    CPaintDC PaintDC(this); // device context for painting
    CMemDC dc(&PaintDC);
    //CPaintDC dc(this);    // device context for painting (if not double buffering)

    LeftRect = RightRect = ClientRect;

    LeftRect.right = LeftRect.left + (int)((LeftRect.right - LeftRect.left) * Fraction);
    dc.FillSolidRect(LeftRect, m_colFore);

    RightRect.left = LeftRect.right;
    dc.FillSolidRect(RightRect, m_colBk);

    if (m_bShowText)
    {
        CString str;
        if (m_strText.GetLength())
        {
            if (m_strText.ReverseFind(L'%') < 0)
            {
                str.Format(_T("%s (%d %%)"), m_strText, (int)(Fraction * 100.0));
            }
            else
            {
                str = m_strText;
            }
        }
        else
        {
            str.Format(_T("%d%%"), (int)(Fraction * 100.0));
        }

        dc.SetBkMode(TRANSPARENT);

        CRgn rgn;
        rgn.CreateRectRgn(LeftRect.left, LeftRect.top, LeftRect.right, LeftRect.bottom);
        dc.SelectClipRgn(&rgn);
        dc.SetTextColor(m_colTextBk);

        dc.DrawText(str, ClientRect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

        rgn.DeleteObject();
        rgn.CreateRectRgn(RightRect.left, RightRect.top, RightRect.right, RightRect.bottom);
        dc.SelectClipRgn(&rgn);
        dc.SetTextColor(m_colTextFore);

        dc.DrawText(str, ClientRect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
    }
}

void CTextProgressCtrl::SetForeColour(COLORREF col)
{
    m_colFore = col;
}

void CTextProgressCtrl::SetBkColour(COLORREF col)
{
    m_colBk = col;
}

void CTextProgressCtrl::SetTextForeColour(COLORREF col)
{
    m_colTextFore = col;
}

void CTextProgressCtrl::SetTextBkColour(COLORREF col)
{
    m_colTextBk = col;
}

COLORREF CTextProgressCtrl::GetForeColour()
{
    return m_colFore;
}

COLORREF CTextProgressCtrl::GetBkColour()
{
    return m_colBk;
}

COLORREF CTextProgressCtrl::GetTextForeColour()
{
    return m_colTextFore;
}

COLORREF CTextProgressCtrl::GetTextBkColour()
{
    return m_colTextBk;
}
/////////////////////////////////////////////////////////////////////////////
// CTextProgressCtrl message handlers

void CTextProgressCtrl::SetShowText(BOOL bShow)
{
    if (::IsWindow(m_hWnd) && m_bShowText != bShow)
        Invalidate();

    m_bShowText = bShow;
}


void CTextProgressCtrl::SetRange(int nLower, int nUpper)
{
    m_nMax = nUpper;
    m_nMin = nLower;
}

int CTextProgressCtrl::SetPos(int nPos)
{
    if (!::IsWindow(m_hWnd))
        return -1;

    int nOldPos = m_nPos;
    m_nPos = nPos;

    CRect rect;
    GetClientRect(rect);

    double Fraction = (double)(m_nPos - m_nMin) / ((double)(m_nMax - m_nMin));
    int nBarWidth = (int)(Fraction * rect.Width());

    if (nBarWidth != m_nBarWidth)
    {
        m_nBarWidth = nBarWidth;
        RedrawWindow();
    }

    return nOldPos;
}

int CTextProgressCtrl::StepIt()
{
    return SetPos(m_nPos + m_nStepSize);
}

int CTextProgressCtrl::OffsetPos(int nPos)
{
    return SetPos(m_nPos + nPos);
}

int CTextProgressCtrl::SetStep(int nStep)
{
    int nOldStep = m_nStepSize;
    m_nStepSize = nStep;
    return nOldStep;
}

TextProgressCtrl.h

#if !defined(AFX_TEXTPROGRESSCTRL_H__4C78DBBE_EFB6_11D1_AB14_203E25000000__INCLUDED_)
#define AFX_TEXTPROGRESSCTRL_H__4C78DBBE_EFB6_11D1_AB14_203E25000000__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

// TextProgressCtrl.h : header file
//
// Written by Chris Maunder (chrismaunder@codeguru.com)
// Copyright 1998.
//
// Modified : 26/05/98 Jeremy Davis, jmd@jvf.co.uk
//              Added colour routines
//
// TextProgressCtrl is a drop-in replacement for the standard 
// CProgressCtrl that displays text in a progress control.
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed by any means PROVIDING it is not sold for
// profit without the authors written consent, and providing that this
// notice and the authors name is included. If the source code in 
// this file is used in any commercial application then an email to
// the me would be nice.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability if it causes any damage to your
// computer, causes your pet cat to fall ill, increases baldness or
// makes you car start emitting strange noises when you start it up.
//
// Expect bugs.
// 
// Please use and enjoy. Please let me know of any bugs/mods/improvements 
// that you have found/implemented and I will fix/incorporate them into this
// file. 

/////////////////////////////////////////////////////////////////////////////
// CTextProgressCtrl window

class CTextProgressCtrl : public CProgressCtrl
{
// Construction
public:
    CTextProgressCtrl();

// Attributes
public:

// Operations
public:
    int         SetPos(int nPos);
    int         StepIt();
    void        SetRange(int nLower, int nUpper);
    int         OffsetPos(int nPos);
    int         SetStep(int nStep);
    void        SetForeColour(COLORREF col);
    void        SetBkColour(COLORREF col);
    void        SetTextForeColour(COLORREF col);
    void        SetTextBkColour(COLORREF col);
    COLORREF    GetForeColour();
    COLORREF    GetBkColour();
    COLORREF    GetTextForeColour();
    COLORREF    GetTextBkColour();

    void        SetShowText(BOOL bShow);

// Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CTextProgressCtrl)
    //}}AFX_VIRTUAL

// Implementation
public:
    virtual ~CTextProgressCtrl();

    // Generated message map functions
protected:
    int         m_nPos, 
                m_nStepSize, 
                m_nMax, 
                m_nMin;
    CString     m_strText;
    BOOL        m_bShowText;
    int         m_nBarWidth;
    COLORREF    m_colFore,
                m_colBk,
                m_colTextFore,
                m_colTextBk;

    //{{AFX_MSG(CTextProgressCtrl)
    afx_msg BOOL OnEraseBkgnd(CDC* pDC);
    afx_msg void OnPaint();
    afx_msg void OnSize(UINT nType, int cx, int cy);
    //}}AFX_MSG
    afx_msg LRESULT OnSetText(WPARAM wParam, LPARAM lParam);
    afx_msg LRESULT OnGetText(WPARAM wParam, LPARAM lParam);

    DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_TEXTPROGRESSCTRL_H__4C78DBBE_EFB6_11D1_AB14_203E25000000__INCLUDED_)

Обнаружены ошибки

C2011 'CMemDC': 'class' type redefinition
'dc' uses undefined class 'CMemDC'
'initializing': cannot convert from 'CPaintDC*' to 'int'

1 Ответ

2 голосов
/ 21 января 2020

Класс CMemDC, на который вы ссылаетесь, происходит из старой статьи кодового проекта и предшествует классу CMemDC, встроенному в более поздние версии MF C. Так что возникает конфликт из-за одноименных классов.

Вам, конечно, не нужно устанавливать более старую Visual Studio для построения примера, но вам нужно как-то разрешить конфликт. Это можно сделать двумя способами:

  1. Изменить код примера и переименовать класс CMemDC во что-то другое.
  2. Изменить код примера и заключить неофициальный класс в пространство имен .

например, (2).

namespace CodeProject
{
    class CMemDc : public CDC
    { 
    ...
    };
}

и квалифицировать его вхождение

CodeProject::CMemDC dc(&PaintDC);
...