首先，我想让你知道我使用的代码与可以在GitHub中找到的代码相同。其次，我已经在线尝试了各种解决方案，例如设置标头块或将#pragma once放在 cpp 文件顶部，但仍然产生与下面提到的相同错误。
我感到困惑的是如何在各种存储库中找到此代码，但我无法使用VS 2019构建它。
我的猜测是我需要安装 VS 2010 才能正确构建，但我认为这是解决此问题的最后手段。
任何想法将不胜感激。谢谢。
文本进度Ctrl.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_)
发现的错误
C2011 'CMemDC': 'class' type redefinition
'dc' uses undefined class 'CMemDC'
'initializing': cannot convert from 'CPaintDC*' to 'int'
您引用的CMemDC类源自旧的代码项目文章，早于更高版本的 MFC 中内置的CMemDC类。因此，由于具有相同命名的类而存在冲突。
您当然不需要安装较旧的Visual Studio来构建示例，但确实需要以某种方式协调冲突。这样做的两种方法是：
- 修改示例代码并将
CMemDC类重命名为其他名称。 - 修改示例代码并将非官方类包装在命名空间中。
例如(2(。
namespace CodeProject
{
class CMemDc : public CDC
{
...
};
}
并限定其发生
CodeProject::CMemDC dc(&PaintDC);