Re: Button error

From:
"Jeff Partch [MVP]" <jeffp@mvps.org>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 24 May 2006 21:00:20 -0500
Message-ID:
<#4qd775fGHA.4276@TK2MSFTNGP03.phx.gbl>
<liuerbin2000@163.com> wrote in message
news:1148521630.290039.35780@j55g2000cwa.googlegroups.com...

// GASDoc.h : interface of the CGASDoc class
CGASDoc : public CDocument
{
public:
int m_dmaxA;
.......
}

// A.h : header file
#include"GASDoc.h"
class CA: public CDialog
{
public:
CGASDoc* pDoc;
void someaction();
int m_dmaxA;
}

// B.h : header file
class CB : public CDialog
{
// Dialog Data
//{{AFX_DATA(CB)
enum { IDD = IDD_B };
int m_dmaxA;
//}}AFX_DATA

//A.cpp
void CA::someaction()
{

CB dlg;
if(dlg.DoModal()==IDOK)
{
      pDoc->m_dmaxA=m_dmaxA=dlg.m_dmaxA;
            }

}

its all right when compiling , but , when runing it has a wrong .
Usingthe debug tool , i find it stop at the location :
      pDoc->m_dmaxA=m_dmaxA=dlg.m_dmaxA;
it said that :
Unhandled exception in GAS. exe :0xC0000005 ; Access Violation


When and where do you initialize pDoc?
--
Jeff Partch [VC++ MVP]

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