At the run time getting Assert Error : Access violation reading location

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HI
I have created a splitter window and i have created 2 views. one view is loading properly but another one is not loading, while running i am getting the error like:
AccAccess violation reading location 0x00000020.

This error i am getting at line bellow under lined

AFX_STATIC void AFXAPI _AfxDeferClientPos(AFX_SIZEPARENTPARAMS* lpLayout,
CWnd* pWnd, int x, int y, int cx, int cy, BOOL bScrollBar)
{
ASSERT(pWnd != NULL);
ASSERT(pWnd->m_hWnd != NULL);.

My code for creating views is like this.

C#

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
    m_splitwnd.CreateStatic( this, 1, 2 );
    m_splitwnd.CreateView( 0, 0, RUNTIME_CLASS(CFirstView), CSize( 100, 100 ), pContext );
    m_splitwnd.CreateView( 0, 1, RUNTIME_CLASS(CSecondView), CSize( 200, 200 ), pContext );

    return TRUE;
}

can any one help me.

Thanks In Advance

Posted 21-Feb-11 22:20pm

savita_Bgm

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Comments

Olivier Levrey 22-Feb-11 7:41am

Most likely the problem comes from CSecondView. Could you give more details about this class?

4 solutions

Solution 4

Take a look at this snippet:
https://vcpptips.wordpress.com/tag/oncreateclient/[^]

Regards
Espen Harlinn

Posted 24-Feb-11 23:48pm

Espen Harlinn

Comments

savita_Bgm 2-Mar-11 0:43am

not able to open this website.

Espen Harlinn 2-Mar-11 11:38am

Works fine for me, I just tried it :)

Solution 1

The return statement seems incorrect to me. Try this:

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs,
    CCreateContext* pContext)
{
    m_splitwnd.CreateStatic( this, 1, 2 );
    m_splitwnd.CreateView( 0, 0, RUNTIME_CLASS(CFirstView),
        CSize( 100, 100 ), pContext );
    m_splitwnd.CreateView( 0, 1, RUNTIME_CLASS(CSecondView),
        CSize( 200, 200 ), pContext );
    return __super::OnCreateClient(lpcs, pContext);
}

Posted 22-Feb-11 1:48am

Olivier Levrey

Updated 22-Feb-11 1:49am

v2

Comments

savita_Bgm 22-Feb-11 23:00pm

Hi
Thanks for Suggestion But again it is showing the same error and if click on retry Button it's entering into endless loop. But when i put the same view name in the second line also it is running properly.

Olivier Levrey 23-Feb-11 3:37am

Keep the return statement anyway. Just returning TRUE is without doubt not enough.
So there is a problem in the second class. Unless you give more details about that class I (or somebody else) can't help further.

savita_Bgm 25-Feb-11 3:33am

HI

this code for the Second View Class

<pre lang="cs">#include "stdafx.h"

#include "SecondView.h"
#include "ComputerDoc.h"
#include <afxwin.h>
#include <afxcview.h>

// CSecondView

IMPLEMENT_DYNCREATE(CSecondView, CFormView)

CSecondView::CSecondView()
: CFormView(CSecondView::IDD)
{

}

CSecondView::~CSecondView()
{
}

void CSecondView::DoDataExchange(CDataExchange* pDX)
{
CFormView::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CSecondView, CFormView)
ON_BN_CLICKED(IDC_Browse_File, &CSecondView::OnBnClickedBrowsefile)
END_MESSAGE_MAP()

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

return CFormView::PreCreateWindow(cs);
}

void CSecondView::OnInitialUpdate()
{
CFormView::OnInitialUpdate();
GetParentFrame()->RecalcLayout();
ResizeParentToFit();

}

// CSecondView diagnostics

#ifdef _DEBUG
void CSecondView::AssertValid() const
{
CFormView::AssertValid();
}

CComputerDoc* CSecondView::GetDocument() const // non-debug version is inline
{
ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CComputerDoc)));
return (CComputerDoc*)m_pDocument;

}

#ifndef _WIN32_WCE
void CSecondView::Dump(CDumpContext& dc) const
{
CFormView::Dump(dc);
}
#endif
#endif //_DEBUG

// CSecondView message handlers

void CSecondView::OnBnClickedBrowsefile()
{
// TODO: Add your control notification handler code here
}
</pre>

please check it.

Solution 3

OK here is your code for the CSecondView class. I just copied/pasted from your comment, so it is more readable:

#include "stdafx.h"
#include "SecondView.h"
#include "ComputerDoc.h"
#include <afxwin.h>
#include <afxcview.h>

// CSecondView
IMPLEMENT_DYNCREATE(CSecondView, CFormView)
CSecondView::CSecondView()
   : CFormView(CSecondView::IDD)
{
}
CSecondView::~CSecondView()
{
}
void CSecondView::DoDataExchange(CDataExchange* pDX)
{
   CFormView::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CSecondView, CFormView)
   ON_BN_CLICKED(IDC_Browse_File, &CSecondView::OnBnClickedBrowsefile)
END_MESSAGE_MAP()

BOOL CSecondView::PreCreateWindow(CREATESTRUCT& cs)
{
   // TODO: Modify the Window class or styles here by modifying
   //  the CREATESTRUCT cs
   return CFormView::PreCreateWindow(cs);
}
void CSecondView::OnInitialUpdate()
{
   CFormView::OnInitialUpdate();
   GetParentFrame()->RecalcLayout();
   ResizeParentToFit();
}

// CSecondView diagnostics
#ifdef _DEBUG
void CSecondView::AssertValid() const
{
   CFormView::AssertValid();
}
CComputerDoc* CSecondView::GetDocument() const // non-debug version is inline
{
   ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CComputerDoc)));
   return (CComputerDoc*)m_pDocument;
}
#ifndef _WIN32_WCE
void CSecondView::Dump(CDumpContext& dc) const
{
   CFormView::Dump(dc);
}
#endif
#endif //_DEBUG

// CSecondView message handlers
void CSecondView::OnBnClickedBrowsefile()
{
   // TODO: Add your control notification handler code here
}

Since it is quite empty, there is not much to check:
- Check that your Form ID is correct (maybe you deleted the resource by mistake from the .rc file and the ID number is still defined in resource.h?).
- The problem may come from the 2 lines you added in OnInitialUpdate. Actually, since they are the only 2 lines you added, the problem must come from those lines...

Maybe the parent form is not fully initialized at that time and the call to RecalcLayout is too early. Try to remove them.

Posted 24-Feb-11 22:37pm

Olivier Levrey

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savita_Bgm · Accepted Answer · 2011-02-24T20:31:00

Solution 2

sorry by mistakly i added my text here

Posted 24-Feb-11 20:31pm

savita_Bgm

Updated 24-Feb-11 21:33pm

v2

Comments

Olivier Levrey 25-Feb-11 4:38am

Click the "Reject answer" button to show people you are still waiting for an answer.

savita_Bgm 2-Mar-11 0:42am

ok thank you i m new for this website i don't know many things still now in this website.