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Access Violation from dialog based app in AFX_DATA_INIT

Posted on 1998-06-04
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Last Modified: 2013-11-19
This plain and simple (that was the original goal) dialog based application is suddently issuing an access violation when a CString is being initialized, in this code:

///////////////////////////////////////////////////////////
// CMyDlg dialog

CMyDlg::CMyDlg(CWnd* pParent /*=NULL*/)
      : CDialog(CMyDlg::IDD, pParent)
{
      //{{AFX_DATA_INIT(CDpKeyDlg)
      m_myText = _T("");
      //}}AFX_DATA_INIT
      // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
      m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

It stops at CString::AllocBeforeWrite(int nLen) in Strcore.cpp. I also noticed that it does not call DoDataExchange(CDataExchange* pDX) or OnInitDialog() before it enters the above code and CString initialization.

The worst is that the application was working before this came up. No major change was made, except for adding edit boxes and the variables from ClassWizard itself.

Have you any ideas of what could be happening?

RJV
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Question by:RJV
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2 Comments
 
LVL 15

Accepted Solution

by:
Tommy Hui earned 300 total points
ID: 1315988
It sounds like your program may have corrupted memory before instantiating the dialog and the symptom you see is the string class failing. I would look into making sure you're not corrupting memory. Some things to check are arrays and pointers access and usage.
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Author Comment

by:RJV
ID: 1315989
thui,

Seeing as you did identify the problem, here are the points.

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