我有一个编辑控件，其中包含一个初始位置设置为0的旋转控件。单击向上箭头时，编辑框将从0变为1，这很好。但是当我使用GetPos()时，MyValue是0。当旋转控件再次从1增加到2时，MyValue变为1。按下向下箭头时，编辑框从2变为1，但值变为2。似乎MyValue总是在自旋控制之后的一个动作。

BOOL CAlphaDlg::OnInitDialog() 
{
// default code left out to keep it short ...
// TODO: Add extra initialization here
// set range and initial position
mSpinControl.SetRange(0, 3600); // range
mSpinControl.SetPos(0); // inital position
MyValue =  mSpinControl.GetPos();
// display initial value in buddy editcontrol
mEditControlDisplay.Format("%d", MyValue);
UpdateData(false);
return TRUE;
}

void CAlphaDlg::OnDeltaposSpin1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMUPDOWN pNMUpDown = reinterpret_cast<LPNMUPDOWN>(pNMHDR);
// TODO: Add your control notification handler code here
UpdateData(true);
int MyValue= mSpinControl.GetPos();
std::cout << MyValue << std::endl;
*pResult = 0;

}

我尝试过从editcontrol获取值，但该值显示出相同的行为。如何获取GetPos((的值以匹配编辑控件中显示的内容？

提前谢谢。

编辑：这是完整的代码

// AlphaDlg.cpp : implementation file
//
#include "stdafx.h"
#include "Alpha.h"
#include "AlphaDlg.h"
#include "afxdialogex.h"
#include <iostream>
#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// CAboutDlg dialog used for App About
class CAboutDlg : public CDialogEx
{
public:
CAboutDlg();
// Dialog Data
#ifdef AFX_DESIGN_TIME
enum { IDD = IDD_ABOUTBOX };
#endif
protected:
virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
// Implementation
protected:
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialogEx(IDD_ABOUTBOX)
{
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()

// CAlphaDlg dialog

CAlphaDlg::CAlphaDlg(CWnd* pParent /*=NULL*/)
: CDialogEx(IDD_ALPHA_DIALOG, pParent)
, mEditControlDisplay(_T(""))
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CAlphaDlg::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
DDX_Text(pDX, IDC_EDIT1, mEditControlDisplay);
DDX_Control(pDX, IDC_SPIN1, mSpinControl);
}
BEGIN_MESSAGE_MAP(CAlphaDlg, CDialogEx)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_NOTIFY(UDN_DELTAPOS, IDC_SPIN1, &CAlphaDlg::OnDeltaposSpin1)
END_MESSAGE_MAP()

// CAlphaDlg message handlers
BOOL CAlphaDlg::OnInitDialog()
{
CDialogEx::OnInitDialog();
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
BOOL bNameValid;
CString strAboutMenu;
bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
ASSERT(bNameValid);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// 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
mSpinControl.SetRange(0, 10);
mSpinControl.SetPos(0);
int MyValue = mSpinControl.GetPos();
mEditControlDisplay.Format("%d", MyValue);
UpdateData(false);
return TRUE;  // return TRUE  unless you set the focus to a control
}
void CAlphaDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialogEx::OnSysCommand(nID, lParam);
}
}
// 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 CAlphaDlg::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 CAlphaDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}
void CAlphaDlg::OnDeltaposSpin1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMUPDOWN pNMUpDown = reinterpret_cast<LPNMUPDOWN>(pNMHDR);
// TODO: Add your control notification handler code here
*pResult = 0;
UpdateData(true);
int MyValue = mSpinControl.GetPos();
std::cout << mEditControlDisplay << std::endl;
std::cout << MyValue << std::endl;
}