description
I use MFC AppWizard to create an SDI application test, did not check the ActiveX control, the other for the default Settings, and then add member variables to CTestView class cstrings m_strName, CTestDialog create dialog box class, and use the wizard to add a member variable CTime m_dataTime (to be automatic add (DDX),
After CTestView: : ontouch * pDC (CDC) created in DLG CTestDialog object, using DoModal generation window, on m_strName assignment, compiled through, but the operation error,
Found in the Debug, after call DoModal, originally save m_strName address part of the memory (4 bytes) content will be modified, lead to can't find m_strName value (new address cross-border, the original address to content did not change),
and when I am alone EditBox control won't appear this kind of problem, so I want to know what has happened to the middle, what is the difference and how to correctly use DataTimePicker controls,

code section
TestView. H

 
//testView. H: interface of the CTestView class 
//
/////////////////////////////////////////////////////////////////////////////

#if ! Defined (AFX_TESTVIEW_H__85D7C03F_39A6_4535_80A5_5E109333D12B__INCLUDED_) 
# define AFX_TESTVIEW_H__85D7C03F_39A6_4535_80A5_5E109333D12B__INCLUDED_ 

# if _MSC_VER & gt; 1000 
# pragma once 
# endif//_MSC_VER & gt; 1000 


The class CTestView: public CView 
{
Protected://create the from serialization only 
CTestView (); 
DECLARE_DYNCREATE (CTestView) 

//the Attributes 
Public: 
CTestDoc * GetDocument (); 
Cstrings m_strName; 

//Operations 
Public: 

//Overrides 
//ClassWizard generated virtual function overrides 
//{{AFX_VIRTUAL (CTestView) 
Public: 
Virtual void ontouch * pDC (CDC);//overridden to draw this view 
Virtual BOOL PreCreateWindow (CREATESTRUCT& Cs); 
Protected: 
Virtual BOOL OnPreparePrinting (CPrintInfo * pInfo); 
Virtual void OnBeginPrinting (CDC * pDC, CPrintInfo * pInfo); 
Virtual void OnEndPrinting (CDC * pDC, CPrintInfo * pInfo); 
//}} AFX_VIRTUAL 

//Implementation 
Public: 
Virtual ~ CTestView (); 
# ifdef _DEBUG 
Virtual void AssertValid () const; 
Virtual void Dump (CDumpContext& Dc) const; 
# endif 

Protected: 

//Generated message map functions provides 
Protected: 
//{{AFX_MSG (CTestView) 
//NOTE - the ClassWizard will add and remove member functions provides here. 
//DO NOT EDIT what you see in these blocks of generated code! 
//}} AFX_MSG 
DECLARE_MESSAGE_MAP () 
}; 

# # ifndef _DEBUG//debug version in testView. CPP 
The inline CTestDoc * CTestView: : GetDocument () 
{return (CTestDoc *) m_pDocument; } 
# endif 

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}} 
//Microsoft Visual c + + will insert additional declarations immediately before the previous line. 

# endif//! Defined (AFX_TESTVIEW_H__85D7C03F_39A6_4535_80A5_5E109333D12B__INCLUDED_) 

TestView. CPP

 
//testView. CPP: implementation of the CTestView class 
//

# include "stdafx. H" 
# include "test. H" 

# include "testDoc. H" 
# include "testView. H" 

# ifdef _DEBUG 
# define new DEBUG_NEW 
# undef THIS_FILE 
The static char THIS_FILE []=__FILE__; 
# endif 

/////////////////////////////////////////////////////////////////////////////
//CTestView 

IMPLEMENT_DYNCREATE (CTestView, CView) 

BEGIN_MESSAGE_MAP (CTestView, CView) 
//{{AFX_MSG_MAP (CTestView) 
//NOTE - the ClassWizard will add and remove the mapping macros here. 
//DO NOT EDIT what you see in these blocks of generated code! 
//}} AFX_MSG_MAP 
//Standard printing commands 
ON_COMMAND (ID_FILE_PRINT, CView: : OnFilePrint) 
ON_COMMAND (ID_FILE_PRINT_DIRECT, CView: : OnFilePrint) 
ON_COMMAND (ID_FILE_PRINT_PREVIEW, CView: : OnFilePrintPreview) 
END_MESSAGE_MAP () 

/////////////////////////////////////////////////////////////////////////////
//CTestView construction/destruction 

CTestView: : CTestView () 
{
//TODO: add construction code here 
M_strName="0000"; 
} 

CTestView: : ~ CTestView () 
{
} 

BOOL CTestView: : PreCreateWindow (CREATESTRUCT& Cs) 
{
//TODO: Modify the Window class or styles here by modifying the 
//the CREATESTRUCT cs 

Return the CView: : PreCreateWindow (cs); 
} 

/////////////////////////////////////////////////////////////////////////////
//CTestView drawing 

Void CTestView: : ontouch * pDC (CDC) 
{
CTestDoc * pDoc=GetDocument (); 
ASSERT_VALID (pDoc); 
//TODO: add the draw code for native data here 
CTestDialog DLG. 
DLG. DoModal (); 
M_strName="11111"; 
} 

/////////////////////////////////////////////////////////////////////////////
//CTestView printing 

BOOL CTestView: : OnPreparePrinting (CPrintInfo * pInfo) 
{
//the default preparation 
Return DoPreparePrinting (pInfo); 
} 

Void CTestView: : OnBeginPrinting (CDC, pDC */* */pInfo CPrintInfo */* */) 
{
//TODO: add extra initialization before printing 
} 

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