we can now generate about 50000bits. my code cannot generate more than 60000 bit..please help me............m_B is member variable and type is CString.

// LFSR_ECDlg.cpp : implementation file
//

#include "stdafx.h"
#include "myecc.h"
#include "LFSR_ECDlg.h"
#include "MyClass.h"

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

extern MyClass mycrv;
/////////////////////////////////////////////////////////////////////////////
// LFSR_ECDlg dialog


LFSR_ECDlg::LFSR_ECDlg(CWnd* pParent /*=NULL*/)
    : CDialog(LFSR_ECDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(LFSR_ECDlg)
    m_C1 = 0;
    m_C2 = 0;
    m_B = _T("");
    m_p = _T("");
    m_Qty = 0;
    m_time = _T("");
    //}}AFX_DATA_INIT
}


void LFSR_ECDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(LFSR_ECDlg)
    DDX_Text(pDX, IDC_C1, m_C1);
    DDX_Text(pDX, IDC_C2, m_C2);
    DDX_Text(pDX, IDC_Sequence, m_B);
    DDX_Text(pDX, IDC_Sequence2, m_p);
    DDX_Text(pDX, IDC_QTY, m_Qty);
    DDV_MinMaxLong(pDX, m_Qty, 0, 2147483647);
    DDX_Text(pDX, IDC_time, m_time);
    //}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(LFSR_ECDlg, CDialog)
    //{{AFX_MSG_MAP(LFSR_ECDlg)
    ON_WM_SETCURSOR()
    ON_EN_CHANGE(IDC_Sequence, OnGeneratorLFSR)
    ON_MESSAGE(WM_MYPAINTMESSAGE,PaintMyCaption)//by ttyu
    ON_BN_CLICKED(IDC_save, Onsave)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// LFSR_ECDlg message handlers

bool LFSR_ECDlg::CheckDataEntry()
{

//if((m_Px>=mycrv.p)|(m_Py>=mycrv.p)) {AfxMessageBox("Seed [P] is invalid!");return false;}//by ttyu
    if((m_C1<=0) | (m_C1>mycrv.n)) {AfxMessageBox("Constant c1 is not valid!");return false;}
    if((m_C2<=0 )| (m_C2>mycrv.n)) {AfxMessageBox("Constant c2  is not valid!");return false;}


return true;

}

void LFSR_ECDlg::OnOK() 
{
    UpdateData(true);
static int stime,etime,dtime;
    CString txt;
    m_time="";
    CTime t(CTime::GetCurrentTime());  
CString txt1;
        txt1="";

    //ms = t.GetDay();  // TODO: Add extra validation here
    stime=t.GetTime();
    txt1.Format("%d",stime);
        AfxMessageBox (txt1);

    txt="";
        if (CheckDataEntry()) OnGeneratorLFSR();
        etime=t.GetTime();
        CString txt2;
        txt2="";
        txt2.Format("%d",etime);
        AfxMessageBox (txt2);
        dtime=etime-stime;
        txt.Format("%f",dtime);
        m_time+=txt;
    //  UpdateData(false);
//rtime.Format("%s, %s %d, %d.",day,month,dd,yy);
    //CDialog::OnOK();
}

void LFSR_ECDlg::OnCancel() 
{
    // TODO: Add extra cleanup here

    CDialog::OnCancel();
}


void LFSR_ECDlg::OnGeneratorLFSR() 
{
    // TODO: If this is a RICHEDIT control, the control will not
    // send this notification unless you override the CDialog::OnInitDialog()
    // function and call CRichEditCtrl().SetEventMask()
    // with the ENM_CHANGE flag ORed into the mask.

    // TODO: Add your control notification handler code here
    point P0,P1,P2;

    P0 = mycrv.G;
    P1 = mycrv.MulPoint(P0,2);

    int C1=m_C1, C2=m_C2, n=m_Qty, k=0;
    int q= (mycrv.p-1) / 2;

    m_p = "";
    m_B = "";

    CString txt;

    for(int i=0;i<n;i++)
    {
        txt="";
        if(P0==mycrv.O) txt.Format("O");
        else txt.Format("(%d, %d)",P0.x,P0.y);
        m_p +=txt;
        m_p += 13;
        m_p += 10;

        if((P0.y >= 0)&&(P0.y <= q)) m_B += "0";
        else if(P0 == mycrv.O) m_B += "0";
        else m_B += "1";
        //m_B += 13;//by ttyu
    //  m_B += 10;//by ttyu

        P2 = mycrv.AddPoints(mycrv.MulPoint(P1,C2), mycrv.MulPoint(P0,C1));
        P0 = P1;
        P1 = P2;
    }

}


BOOL LFSR_ECDlg::OnInitDialog() 
{
    CDialog::OnInitDialog();

    // TODO: Add extra initialization here

    //code for dlg bar
    CString str="LFSR_EC";
    m_cap.SetCaption (str);
    m_cap.Install (this,WM_MYPAINTMESSAGE);
    //////////////////////////////

    return TRUE;  // return TRUE unless you set the focus to a control
                  // EXCEPTION: OCX Property Pages should return FALSE
}

LRESULT LFSR_ECDlg::PaintMyCaption(WPARAM wp, LPARAM lp)
{
    m_cap.PaintCaption(wp,lp);
    return 0;
}



BOOL LFSR_ECDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
    // TODO: Add your message handler code here and/or call default

    return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

void LFSR_ECDlg::Onsave() 
{
this->UpdateData();

    CFile bitstream;
    char strFilter[] = { "Stream Records (*.mpl)|*.mpl| (*.pis)|*.pis|All Files (*.*)|*.*||" };

    CFileDialog FileDlg(FALSE, ".mpl", NULL, 0, strFilter);

//insertion//by TTT

    CFile cf_object;
    if( FileDlg.DoModal() == IDOK ){
    cf_object.Open( FileDlg.GetFileName(), CFile::modeCreate|CFile::modeWrite);
    //char szText[100];
    //strcpy(szText, "File Write Test");
        CString txt;
        txt="";
        txt.Format("%s",m_B);//by ANO
        AfxMessageBox (txt);//by ANO
    int mB_size=m_B.GetLength();
    cf_object.Write (m_B,mB_size); 

    //insertion end




/*  if( FileDlg.DoModal() == IDOK )
    {
        if( bitstream.Open(FileDlg.GetFileName(), CFile::modeCreate | CFile::modeWrite) == FALSE )
            return;
        CArchive ar(&bitstream, CArchive::store);


        CString txt;
        txt="";
        txt.Format("%s",m_B);//by ANO
        AfxMessageBox (txt);//by ANO
        //txt=m_B;//by ANO
        ar <<txt;//by ANO

        ar.Close();
    }
    else
        return;

    bitstream.Close();
    */
    // TODO: Add your control notification handler code here




}
}