有一个例题,除了声明、定义、MessageMap和OnCreate之外,只有简单的以下代码:
void CMFC_Eg1003Dlg::OnMaxtextEdit1()
{
// TODO: Add your control notification handler code here
MessageBox("To many");
}
题目本来是一个单文档结构的,我把它改成了对话框式的。不管什么时候都无法弹出对话框。我不知道问题出在哪里?另外,最大字符数是在什么地方设置的?没有设置字符数目,这个消息怎么触发呢?
void CMFC_Eg1003Dlg::OnMaxtextEdit1()
{
// TODO: Add your control notification handler code here
MessageBox("To many");
}
题目本来是一个单文档结构的,我把它改成了对话框式的。不管什么时候都无法弹出对话框。我不知道问题出在哪里?另外,最大字符数是在什么地方设置的?没有设置字符数目,这个消息怎么触发呢?
那你把这个函数的
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
和//{{AFX_MSG(CEncryAndDecryptDlg)
//...
//}}AFX_MSG
贴出来看看~~~
最大字符数通过 CEdit::SetLimitText 或是消息 EM_LIMITTEXT 来设置
// DlgExDlg.h : header file
//#if !defined(AFX_DLGEXDLG_H__FC0F1FFB_2CA2_4437_8282_569F7AB18B36__INCLUDED_)
#define AFX_DLGEXDLG_H__FC0F1FFB_2CA2_4437_8282_569F7AB18B36__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000/////////////////////////////////////////////////////////////////////////////
// CDlgExDlg dialogclass CDlgExDlg : public CDialog
{
// Construction
public:
CDlgExDlg(CWnd* pParent = NULL); // standard constructor// Dialog Data
//{{AFX_DATA(CDlgExDlg)
enum { IDD = IDD_DLGEX_DIALOG };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CDlgExDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
HICON m_hIcon; // Generated message map functions
//{{AFX_MSG(CDlgExDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnMaxtextEdit1();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_DLGEXDLG_H__FC0F1FFB_2CA2_4437_8282_569F7AB18B36__INCLUDED_)
// DlgExDlg.cpp : implementation file
//#include "stdafx.h"
#include "DlgEx.h"
#include "DlgExDlg.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:
CAboutDlg();// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CDlgExDlg dialogCDlgExDlg::CDlgExDlg(CWnd* pParent /*=NULL*/)
: CDialog(CDlgExDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CDlgExDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CDlgExDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CDlgExDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CDlgExDlg, CDialog)
//{{AFX_MSG_MAP(CDlgExDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_EN_MAXTEXT(IDC_EDIT1, OnMaxtextEdit1)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CDlgExDlg message handlersBOOL CDlgExDlg::OnInitDialog()
{
CDialog::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)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
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
return TRUE; // return TRUE unless you set the focus to a control
}void CDlgExDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::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 CDlgExDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (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
{
CDialog::OnPaint();
}
}// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CDlgExDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CDlgExDlg::OnMaxtextEdit1()
{
// TODO: Add your control notification handler code here
MessageBox("To many words!");
}