【发布时间】:2018-12-25 11:26:15
【问题描述】:
我有一个编辑控件和一个初始位置设置为 0 的旋转控件。单击向上箭头时,编辑框从 0 变为 1,这很好。但是当我使用GetPos() 时,MyValue 为 0。当自旋控件再次从 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 . 看来MyValue 永远是spin control 后面的一个action。
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;
}
我尝试从编辑控件中获取值,但该值表现出相同的行为。如何获取 GetPos() 的值以匹配编辑控件中显示的内容?
提前谢谢你。
编辑:这里是完整的代码
// 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;
}
【问题讨论】:
-
目前还不清楚,为什么要调用UpdateData 然后继续手动填充控件,或者手动读回它们。这就是
UpdateData应该已经为你做的事情了。 -
@IInspectable 我的错误,当我试图从中获取值时,OnDeltaposSpin1 中的 UpdateDate(true) 用于从编辑控件中检索数据,因为它显示了正确的值。它不起作用并且具有相同的延迟行为。我删除了 std::cout
-
在
OnInitDialog中调用UpdateData怎么样?不需要那个,除非您没有调用基类实现。你应该打电话给哪个。 -
@IInspectable OnInitDialog中调用的UpdateData用于在编辑控制框中显示初始值0。没有它,在单击旋转控件之前,编辑控件框将保持空白。
-
这意味着,您没有调用基类实现。不调用基类实现会阻止对话框正确初始化。这就是您要提供完整代码的原因。
标签: c++ visual-studio-2015 mfc controls