MFC Assertion Failure

Hey all. I was trying to write and run an MFC program that displays a fractal, and I seem to be having a bit of a problem. After the fist iteration through, it blows up! I was wondering if you people had any ideas.

thanks!!

-maxthecat

The listing is rather long, since I included all of the files, but I am sure the problem is in the implementation of the Timer function in ChildView.cpp ...If anyone would rather have me simply send them the workspace and files, just email me, [email protected] ...Thanks a ton for the help! (It's been driving me nuts! I've even tried to debug it step by step, going through the AfxWin files...)

/**************************************************
ChildView.cpp
**************************************************/

// ChildView.cpp : implementation of the CChildView class
//

#include "stdafx.h"
#include "mfc.h"
#include "ChildView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CChildView

CChildView::CChildView()
{
}

CChildView::~CChildView()
{
}


BEGIN_MESSAGE_MAP(CChildView,CWnd )
//{{AFX_MSG_MAP(CChildView)
ON_WM_PAINT()
ON_WM_SIZE()
ON_WM_TIMER()
ON_WM_CREATE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CChildView message handlers

BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs)
{
if (!CWnd::PreCreateWindow(cs))
return FALSE;

cs.dwExStyle |= WS_EX_CLIENTEDGE;
cs.style &= ~WS_BORDER;
cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCL KS,
::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1), NULL);

return TRUE;
}

void CChildView::OnPaint()
{

CPaintDC dc(this); // device context for painting

// TODO: Add your message handler code here

// Do not call CWnd::OnPaint() for painting messages
}


void CChildView::OnSize(UINT nType, int cx, int cy)
{
CWnd ::OnSize(nType, cx, cy);
CX = cx / 2;
CY = cy / 2;
// TODO: Add your message handler code here

}

void CChildView::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
CClientDC dc(this);
if (flag == 1)
{
dc.MoveTo(CX, CY);
dc.LineTo (CX, (CY + SCALE));
CY += SCALE;
dc.MoveTo (CX, CY);
dc.LineTo ((CX - SCALE), CY);
CX -= SCALE;
dc.MoveTo (CX, CY);
flag = 0;
}
else
{
b = count - 1;
for (b;b>0;b--,a++)
{
if (array[b] == 3)
array.Add (0);
array.Add ((b + 1));
switch (array[a])
{
case 0:
dc.LineTo (CX, (CY + SCALE));
CY += SCALE;
dc.MoveTo (CX, CY);
break;
case 1:
dc.LineTo ((CX - SCALE), CY);
CX -= SCALE;
dc.MoveTo (CX, CY);
break;
case 2:
dc.LineTo (CX, (CY - SCALE));
CY -= SCALE;
dc.MoveTo (CX, CY);
break;
case 3:
dc.LineTo ((CX + SCALE), CY);
CX += SCALE;
dc.MoveTo (CX, CY);
break;
}
}
count = count * count;
}
CWnd ::OnTimer(nIDEvent);
}

int CChildView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CWnd ::OnCreate(lpCreateStruct) == -1)
return -1;
array.SetSize (2);
array[0] = 0;
array[1] = 1;
a = 2;
b = 0;
count = 2;
SCALE = 10;
flag = 1;
SetTimer(1, 1000, NULL);
// TODO: Add your specialized creation code here

return 0;
}

/**********************************************
MainFrm.cpp
***********************************************/

// MainFrm.cpp : implementation of the CMainFrame class
//

#include "stdafx.h"
#include "mfc.h"

#include "MainFrm.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMainFrame

IMPLEMENT_DYNAMIC(CMainFrame, CFrameWnd)

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
//{{AFX_MSG_MAP(CMainFrame)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code !
ON_WM_SETFOCUS()
ON_WM_CREATE()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMainFrame construction/destruction

CMainFrame::CMainFrame()
{
// TODO: add member initialization code here

}

CMainFrame::~CMainFrame()
{
}

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
if( !CFrameWnd::PreCreateWindow(cs) )
return FALSE;
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs

cs.dwExStyle &= ~WS_EX_CLIENTEDGE;
cs.lpszClass = AfxRegisterWndClass(0);
return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CMainFrame diagnostics

#ifdef _DEBUG
void CMainFrame::AssertValid() const
{
CFrameWnd::AssertValid();
}

void CMainFrame::Dump(CDumpContext& dc) const
{
CFrameWnd::Dump(dc);
}

#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMainFrame message handlers
void CMainFrame::OnSetFocus(CWnd* pOldWnd)
{
// forward focus to the view window
m_wndView.SetFocus();
}

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo)
{
// let the view have first crack at the command
if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
return TRUE;

// otherwise, do default handling
return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;
if (!m_wndView.Create(NULL, NULL, AFX_WS_DEFAULT_VIEW, CRect(0,0,0,0), this, AFX_IDW_PANE_FIRST, NULL))
{
TRACE0("Failed to create window\n");
return -1;
}
return 0;
}

/*****************************************
mfc.cpp
*****************************************/
// mfc.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "mfc.h"

#include "MainFrm.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMfcApp

BEGIN_MESSAGE_MAP(CMfcApp, CWinApp)
//{{AFX_MSG_MAP(CMfcApp)
ON_COMMAND(ID_APP_ABOUT, OnAppAbout)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMfcApp construction

CMfcApp::CMfcApp()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CMfcApp object

CMfcApp theApp;

/////////////////////////////////////////////////////////////////////////////
// CMfcApp initialization

BOOL CMfcApp::InitInstance()
{
// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
// the specific initialization routines you do not need.

// Change the registry key under which our settings are stored.
// TODO: You should modify this string to be something appropriate
// such as the name of your company or organization.
SetRegistryKey(_T("Local AppWizard-Generated Applications"));


// To create the main window, this code creates a new frame window
// object and then sets it as the application's main window object.

CMainFrame* pFrame = new CMainFrame;
m_pMainWnd = pFrame;

// create and load the frame with its resources

pFrame->LoadFrame(IDR_MAINFRAME,
WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE, NULL,
NULL);




// The one and only window has been initialized, so show and update it.
pFrame->ShowWindow(SW_SHOW);
pFrame->UpdateWindow();

return TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CMfcApp message handlers





/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class 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)
// No message handlers
//}}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()

// App command to run the dialog
void CMfcApp::OnAppAbout()
{
CAboutDlg aboutDlg;
aboutDlg.DoModal();
}

/////////////////////////////////////////////////////////////////////////////
// CMfcApp message handlers


/********************************************
ChildView.h
*************************************/

// ChildView.h : interface of the CChildView class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_CHILDVIEW_H__F98A6FCA_2F8A_11D6_951A_ 444553540000__INCLUDED_)
#define AFX_CHILDVIEW_H__F98A6FCA_2F8A_11D6_951A_444553540 000__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CChildView window

class CChildView : public CWnd
{
// Construction
public:
CChildView();

// Attributes
public:

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CChildView)
protected:
virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
//}}AFX_VIRTUAL

// Implementation
public:
int flag;
int SCALE;
int a, b;
CUIntArray array;
int count;
int CY;
int CX;

virtual ~CChildView();

// Generated message map functions
protected:
//{{AFX_MSG(CChildView)
afx_msg void OnPaint();
afx_msg void OnSize(UINT nType, int cx, int cy);
afx_msg void OnTimer(UINT nIDEvent);
afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

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

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

#endif // !defined(AFX_CHILDVIEW_H__F98A6FCA_2F8A_11D6_951A_ 444553540000__INCLUDED_)


/*************************************
MainFrm.h
*************************************/
// MainFrm.h : interface of the CMainFrame class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_MAINFRM_H__F98A6FC8_2F8A_11D6_951A_44 4553540000__INCLUDED_)
#define AFX_MAINFRM_H__F98A6FC8_2F8A_11D6_951A_44455354000 0__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "ChildView.h"

class CMainFrame : public CFrameWnd
{

public:
CMainFrame();
protected:
DECLARE_DYNAMIC(CMainFrame)

// Attributes
public:

// Operations
public:

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMainFrame)
virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
virtual BOOL OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo);
//}}AFX_VIRTUAL

// Implementation
public:
virtual ~CMainFrame();
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
CChildView m_wndView;

// Generated message map functions
protected:
//{{AFX_MSG(CMainFrame)
afx_msg void OnSetFocus(CWnd *pOldWnd);
afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
// NOTE - the ClassWizard will add and remove member functions here.
// DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

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

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

#endif // !defined(AFX_MAINFRM_H__F98A6FC8_2F8A_11D6_951A_44 4553540000__INCLUDED_)

/***************************************
mfc.h
***************************************/
// mfc.h : main header file for the MFC application
//

#if !defined(AFX_MFC_H__F98A6FC4_2F8A_11D6_951A_444553 540000__INCLUDED_)
#define AFX_MFC_H__F98A6FC4_2F8A_11D6_951A_444553540000__I NCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h" // main symbols

/////////////////////////////////////////////////////////////////////////////
// CMfcApp:
// See mfc.cpp for the implementation of this class
//

class CMfcApp : public CWinApp
{
public:
CMfcApp();

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMfcApp)
public:
virtual BOOL InitInstance();
//}}AFX_VIRTUAL

// Implementation

public:
//{{AFX_MSG(CMfcApp)
afx_msg void OnAppAbout();
// NOTE - the ClassWizard will add and remove member functions here.
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};


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

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

#endif // !defined(AFX_MFC_H__F98A6FC4_2F8A_11D6_951A_444553 540000__INCLUDED_)


/****************************************
resource.h
****************************************/
//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by mfc.rc
//
#define IDD_ABOUTBOX 100
#define IDR_MAINFRAME 128
#define IDR_MFCTYPE 129
#define IDD_DIALOG1 130
#define IDC_BUTTON 32771

// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 131
#define _APS_NEXT_COMMAND_VALUE 32772
#define _APS_NEXT_CONTROL_VALUE 1000
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif

/********************************
StdAfx.h
********************************/

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//

#if !defined(AFX_STDAFX_H__F98A6FC6_2F8A_11D6_951A_444 553540000__INCLUDED_)
#define AFX_STDAFX_H__F98A6FC6_2F8A_11D6_951A_444553540000 __INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#define VC_EXTRALEAN // Exclude rarely-used stuff from Windows headers

#include <afxwin.h> // MFC core and standard components
#include <afxext.h> // MFC extensions
#include <afxdtctl.h> // MFC support for Internet Explorer 4 Common Controls
#ifndef _AFX_NO_AFXCMN_SUPPORT
#include <afxcmn.h> // MFC support for Windows Common Controls
#endif // _AFX_NO_AFXCMN_SUPPORT


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

#endif // !defined(AFX_STDAFX_H__F98A6FC6_2F8A_11D6_951A_444 553540000__INCLUDED_)

/***********************************************
StdAfx.cpp
***********************************************/
// stdafx.cpp : source file that includes just the standard includes
// mfc.pch will be the pre-compiled header
// stdafx.obj will contain the pre-compiled type information

#include "stdafx.h"

Watch out for those smiles in the code.... The board seems to think that any semicolon and "D"should be a happy face.. I guess my code is just too happy :P

-maxthecat

Quote:

---

Originally posted by maxthecat
...If anyone would rather have me simply send them the workspace and files, just email me,

---

Can you zip all files (including the project/workspace) and attach it to the thread?

Here's the entire project zipped up.

Thanks!! :)

-maxthecat

I think the problem is your array. Set the timer interval to 10 seconds. This will give you the opportunity to debug the application.

My debug results:

Code:

---

_AFXCOLL_INLINE UINT& CUIntArray::ElementAt(int nIndex)
  { ASSERT(nIndex >= 0 && nIndex < m_nSize);
    return m_pData[nIndex]; }

---

nIndex = 3
m_nSize = 3

Thanks, but I'm still not seeing why this should be failing the assertion... Moreover, it shouldn't be drawing a line from the center of the client area to the left hand corner... very curious... any thoughts?

-maxthecat