从MFC的标识符定义开始

我是一个基于MFC的程序的初学者，在我目前正在开发的程序中，标识符的定义有问题。我已经在下面发布了有问题的片段。程序的其余部分遵循它

DDX_Text(pDX, IDC_BUTTON_CLICKS, m_EchoText);
DDX_Text(pDX, IDC_V_SLIDER_ECHO, m_VSliderEcho);
DDX_Control(pDX, IDC_V_SLIDER_BAR, m_VSliderBar);

//以上几行行行得通。下面这不起作用，我收到一条消息说没有定义IDC__滑动条和IDC__滑动条

DDX_Control(pDX, IDC_H_SLIDER_BAR, m_HSliderBar);
DDX_Text(pDX, IDC_H_SLIDER_ECHO, m_HSliderEcho);

以下是完整的实现文件：

// MFCApplication1Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "MFCApplication1.h"
#include "MFCApplication1Dlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CMFCApplication1Dlg dialog



CMFCApplication1Dlg::CMFCApplication1Dlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CMFCApplication1Dlg::IDD, pParent)
    , m_EchoText(_T(""))
    , m_VSliderEcho(_T(""))
    , m_HSliderEcho(_T(""))
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMFCApplication1Dlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);

    DDX_Text(pDX, IDC_BUTTON_CLICKS, m_EchoText);

    DDX_Text(pDX, IDC_V_SLIDER_ECHO, m_VSliderEcho);
    DDX_Control(pDX, IDC_V_SLIDER_BAR, m_VSliderBar);
    DDX_Control(pDX, IDC_H_SLIDER_BAR, m_HSliderBar);
    DDX_Text(pDX, IDC_H_SLIDER_ECHO, m_HSliderEcho);
}

BEGIN_MESSAGE_MAP(CMFCApplication1Dlg, CDialogEx)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BTN_ADD, &CMFCApplication1Dlg::OnBnClickedBtnAdd)
    ON_WM_VSCROLL()
    ON_WM_HSCROLL()
END_MESSAGE_MAP()


// CMFCApplication1Dlg message handlers

BOOL CMFCApplication1Dlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    m_OkCount = 0;

    m_VSliderBar.SetRange(0, 100, TRUE);
    m_VSliderBar.SetPos(0);
    m_VSliderEcho.Format(_T("%d"), 0);

    m_HSliderBar.SetRange(0, 100, TRUE);
    m_HSliderBar.SetPos(0);
    m_HSliderEcho.Format(_T("%d"), 0);
    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);         // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here

    return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMFCApplication1Dlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMFCApplication1Dlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}



void CMFCApplication1Dlg::OnBnClickedBtnAdd()
{
    // TODO: Add your control notification handler code here
    m_OkCount++;
    m_EchoText.Format(_T("%d"), m_OkCount);
    // without UpdateData() status area will _NOT_ be updated.
    UpdateData(FALSE);

}



void CMFCApplication1Dlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    if (pScrollBar == (CScrollBar *)&m_VSliderBar)
    {
        int value = m_VSliderBar.GetPos();
        m_VSliderEcho.Format(_T("%d"), value);
        UpdateData(FALSE);
    }
    else{

        CDialogEx::OnVScroll(nSBCode, nPos, pScrollBar);
    }
}

void CMFCApplication1Dlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    // TODO: Add your message handler code here and/or call default
    if (pScrollBar == (CScrollBar *)&m_HSliderBar)
    {
        int value = m_HSliderBar.GetPos();
        m_HSliderEcho.Format(_T("%d"), value);
        UpdateData(FALSE);
    }
    else{
        CDialogEx::OnHScroll(nSBCode, nPos, pScrollBar);
    }
}

---

Resource.H

（区分大小写！）中可能未定义

IDC\u滑动条
和
IDC\u滑动条
。
您在头文件中定义了以下变量。因此，问题并没有发生在这些人身上

CString m_EchoText;
CString m_VSliderEcho;
CString m_HSliderEcho;

但未定义以下变量

m_HSliderBar
 m_HSliderEcho

问题出现在Resource.h中，现已修复。在你告诉我之前，我甚至不知道这些定义的位置。谢谢！不太清楚问题出在哪里，但在注释和取消注释某些内容后，丢失的定义神奇地开始出现。。。都在
Resource.h
m_HSliderBar
 m_HSliderEcho