MFC Flicker and the Application Framework

=?Utf-8?B?QyBIaWxsIE1CU0M=?= <>
Tue, 13 Mar 2007 01:49:18 -0700
Dear All!

I have just written a piece of MFC Code to output a counter value every
second to the screen. Could anyone tell me where I have gone wrong, because
the text occasionally flickers with white lines through it! It only happens
occasionally on my machine but is unprofessional! I would like to know
whether there is a problem with MFC, or my code.

P.S. Most of the code was created with AppWizard and message map functions
have been added along with initialisation.

Thank you for your assistance in this matter.

// FlickeringCounterView.cpp : implementation of the CFlickeringCounterView

#include "stdafx.h"
#include "FlickeringCounter.h"

#include "FlickeringCounterDoc.h"
#include "FlickeringCounterView.h"
#include ".\flickeringcounterview.h"

#ifdef _DEBUG
#define new DEBUG_NEW

// CFlickeringCounterView

IMPLEMENT_DYNCREATE(CFlickeringCounterView, CView)

BEGIN_MESSAGE_MAP(CFlickeringCounterView, CView)
    // Standard printing commands

// CFlickeringCounterView construction/destruction

    // TODO: add construction code here
    Counter = 0;


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

    return CView::PreCreateWindow(cs);

// CFlickeringCounterView drawing

void CFlickeringCounterView::OnDraw(CDC* pDC)
    CFlickeringCounterDoc* pDoc = GetDocument();
    if (!pDoc)

    // TODO: add draw code for native data here
    CFont MyFont;
    MyFont.CreatePointFont(240, "Arial");
    pDC->TextOut(0, 0, String);

// CFlickeringCounterView printing

BOOL CFlickeringCounterView::OnPreparePrinting(CPrintInfo* pInfo)
    // default preparation
    return DoPreparePrinting(pInfo);

void CFlickeringCounterView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo*
    // TODO: add extra initialization before printing

void CFlickeringCounterView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo*
    // TODO: add cleanup after printing

// CFlickeringCounterView diagnostics

#ifdef _DEBUG
void CFlickeringCounterView::AssertValid() const

void CFlickeringCounterView::Dump(CDumpContext& dc) const

CFlickeringCounterDoc* CFlickeringCounterView::GetDocument() const //
non-debug version is inline
    return (CFlickeringCounterDoc*)m_pDocument;
#endif //_DEBUG

// CFlickeringCounterView message handlers

void CFlickeringCounterView::OnTimer(UINT nIDEvent)
    // TODO: Add your message handler code here and/or call default
    String.Format("Counter = %i", Counter);
    CPaintDC TmpDC(this);
    CFont MyFont;
    MyFont.CreatePointFont(240, "Arial");
    CSize MySize = TmpDC.GetTextExtent(String);
    CRect MyRect(CPoint(0, 0), CPoint(,;


int CFlickeringCounterView::OnCreate(LPCREATESTRUCT lpCreateStruct)
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;

    // TODO: Add your specialized creation code here
    SetTimer(1, 1000, NULL); // 1Hz Counter Timer

    return 0;

// FlickeringCounterView.h : interface of the CFlickeringCounterView class

#pragma once

class CFlickeringCounterView : public CView
    CString String;
    int Counter;

protected: // create from serialization only

// Attributes
    CFlickeringCounterDoc* GetDocument() const;

// Operations

// Overrides
    virtual void OnDraw(CDC* pDC); // overridden to draw this view
virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
    virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
    virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
    virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);

// Implementation
    virtual ~CFlickeringCounterView();
#ifdef _DEBUG
    virtual void AssertValid() const;
    virtual void Dump(CDumpContext& dc) const;


// Generated message map functions
    afx_msg void OnTimer(UINT nIDEvent);
    afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

#ifndef _DEBUG // debug version in FlickeringCounterView.cpp
inline CFlickeringCounterDoc* CFlickeringCounterView::GetDocument() const
   { return reinterpret_cast<CFlickeringCounterDoc*>(m_pDocument); }


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