Solved

VC++ HELP

Posted on 2003-12-05
4
655 Views
Last Modified: 2012-08-14
My Menus In My VC++ Program Become Inactive When Doing Mathematical Calculations. How Can I Make Them Availible?

Also, How can i make a function run on startup of the program. MFC Aplication
0
Comment
Question by:Deathbob
  • 2
4 Comments
 
LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 9886612
Your (very short) description sounds like you have a program that should start a lengthly calculation, but you still want to use the user interface.

You should create a multi-threaded application with one worker thread (that does the calculation), and a UI thread, that is responsible for handling the user interface.

This article shows how you can do this: http://www.codeguru.com/misc/lenop.html
0
 
LVL 1

Author Comment

by:Deathbob
ID: 9887038
Here is part of the script so you caan see how it is layed out.
This was originaly a C++ application that im converting to VC++.
My main problem is the pseudo_main function must be in the class so i can display info in the program (as far as i know).
Granted im a C++ programer, not so much VC++


// GUIPIDlg.cpp : implementation file
//

#include "stdafx.h"
#include "GUIPI.h"
#include "GUIPIDlg.h"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>

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

/* #define HAS_LONG_LONG */

#ifdef HAS_LONG_LONG
#define mul_mod(a,b,m) (( (long long) (a) * (long long) (b) ) % (m))
#else
#define mul_mod(a,b,m) fmod( (double) a * (double) b, m)
#endif

/////////////////////////////////////////////////////////////////////////////
// CGUIPIDlg dialog

CGUIPIDlg::CGUIPIDlg(CWnd* pParent /*=NULL*/)
      : CDialog(CGUIPIDlg::IDD, pParent)
{
      //{{AFX_DATA_INIT(CGUIPIDlg)
      m_nvalue = _T("");
      m_Start = 0;
      m_Stop = 0;
      m_CR = _T("");
      m_CUR = _T("");
      m_TET = _T("");
      m_CET = _T("");
      m_LT = _T("");
      //}}AFX_DATA_INIT
      // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
      m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CGUIPIDlg::DoDataExchange(CDataExchange* pDX)
{
      CDialog::DoDataExchange(pDX);
      //{{AFX_DATA_MAP(CGUIPIDlg)
      DDX_Control(pDX, IDC_PROGRESS1, m_P);
      DDX_Text(pDX, IDC_EDIT6, m_nvalue);
      DDX_Text(pDX, IDC_Start, m_Start);
      DDX_Text(pDX, IDC_Stop, m_Stop);
      DDX_Text(pDX, IDC_EDIT1, m_CR);
      DDX_Text(pDX, IDC_EDIT2, m_CUR);
      DDX_Text(pDX, IDC_EDIT3, m_TET);
      DDX_Text(pDX, IDC_EDIT4, m_CET);
      DDX_Text(pDX, IDC_EDIT5, m_LT);
      //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CGUIPIDlg, CDialog)
      //{{AFX_MSG_MAP(CGUIPIDlg)
      ON_WM_PAINT()
      ON_WM_QUERYDRAGICON()
      ON_BN_CLICKED(ID_Start, OnStart)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CGUIPIDlg message handlers

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

      // Set the icon for this dialog.  The framework does this automatically
      //  when the application's main window is not a dialog
      SetIcon(m_hIcon, TRUE);                  // Set big icon
      SetIcon(m_hIcon, FALSE);            // Set small icon
      
      // TODO: Add extra initialization here
      
      return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CGUIPIDlg::OnPaint()
{
      if (IsIconic())
      {
            CPaintDC dc(this); // device context for painting

            SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

            // Center icon in client rectangle
            int cxIcon = GetSystemMetrics(SM_CXICON);
            int cyIcon = GetSystemMetrics(SM_CYICON);
            CRect rect;
            GetClientRect(&rect);
            int x = (rect.Width() - cxIcon + 1) / 2;
            int y = (rect.Height() - cyIcon + 1) / 2;

            // Draw the icon
            dc.DrawIcon(x, y, m_hIcon);
      }
      else
      {
            CDialog::OnPaint();
      }
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CGUIPIDlg::OnQueryDragIcon()
{
      return (HCURSOR) m_hIcon;
}

/* returns the inverse of x mod y */

int inv_mod(int x,int y) {
  int q,u,v,a,c,t;

  u=x;
  v=y;
  c=1;
  a=0;
  do {
    q=v/u;
   
    t=c;
    c=a-q*c;
    a=t;
   
    t=u;
    u=v-q*u;
    v=t;
  } while (u!=0);
  a=a%y;
  if (a<0) a=y+a;
  return a;
}

/* returns (a^b) mod m */

int pow_mod(int a,int b,int m)
{
  int r,aa;
   
  r=1;
  aa=a;
  while (1) {
    if (b&1) r=mul_mod(r,aa,m);
    b=b>>1;
    if (b == 0) break;
    aa=mul_mod(aa,aa,m);
  }
  return r;
}
     
/* returns true if n is prime */

int is_prime(int n)
{
   int r,i;
   if ((n % 2) == 0) return 0;

   r=(int)(sqrt(n));
   for(i=3;i<=r;i+=2) if ((n % i) == 0) return 0;
   return 1;
}

/* returns the prime number immediatly after n */

int next_prime(int n)
{
   do {
      n++;
   } while (!is_prime(n));
   return n;
}

/* finds out nine digits of pi starting from n */

/* will probably be the main function in openmosix capable version*/

int CGUIPIDlg::pseudo_main(int n, double cst, int AA, int BB)
{
  int av,a,vmax,N,num,den,k,kq,kq2,t,v,s,i;
  long double sum;
  char filename[100];
  FILE *f_out;
 

  double start_time, elap_time, cstb;
  start_time = (double) clock ();

  sprintf (filename, "%i.pib", n);
  f_out = fopen (filename, "w");

  N=(int)((n+20)*log(10)/log(2));

  sum=0;


  for(a=3;a<=(2*N);a=next_prime(a)) {
    vmax=(int)(log(2*N)/log(a));
    av=1;
    for(i=0;i<vmax;i++) av=av*a;

    s=0;
    num=1;
    den=1;
    v=0;
    kq=1;
    kq2=1;

    for(k=1;k<=N;k++) {

      t=k;
      if (kq >= a) {
       do {
          t=t/a;
          v--;
       } while ((t % a) == 0);
       kq=0;
      }
      kq++;
      num=mul_mod(num,t,av);

      t=(2*k-1);
      if (kq2 >= a) {
       if (kq2 == a) {
          do {
             t=t/a;
             v++;
          } while ((t % a) == 0);
       }
       kq2-=a;
      }

      den=mul_mod(den,t,av);
      kq2+=2;
     
      if (v > 0) {

      t=inv_mod(den,av);
      t=mul_mod(t,num,av);
      t=mul_mod(t,k,av);
      for(i=v;i<vmax;i++) t=mul_mod(t,a,av);
      s+=t;
      if (s>=av) s-=av;
      }
     
    }

    t=pow_mod(10,n-1,av);
    s=mul_mod(s,t,av);

    sum=fmod(sum+(double) s/ (double) av,1.0);
      elap_time = ((double) clock () - (double) start_time) / CLOCKS_PER_SEC;
      cstb = ((double) clock () - (double) cst) / CLOCKS_PER_SEC;
      m_TET.Format("%f",cstb);
      m_CET.Format("%f",elap_time);
UpdateData(FALSE);
UpdateWindow( );

  }

  elap_time = ((double) clock () - (double) start_time) / CLOCKS_PER_SEC;
//  printf("Position: %9d Digits: %09d Time: %9.2lf seconds\n",n,(int)(sum*1e9),elap_time);
m_nvalue.Format("%09d",(int)(sum*1e9));
m_LT.Format("%f",elap_time);
UpdateData(FALSE);
UpdateWindow( );
  fprintf (f_out, "%09d\n", (int)(sum*1e9));
  fclose (f_out);
  sprintf (filename, "start.pib");
  f_out = fopen (filename, "w");
  fprintf (f_out, "%d\n", n);
  fclose (f_out);

  sprintf (filename, "piw/data.txt");
  f_out = fopen (filename, "w");
  fprintf (f_out, "%i-%i\n%s\n%f\n%f\n%i", AA, AA+BB, m_CUR, cstb, elap_time, m_nvalue); //, m_CUR, m_TET, m_CET, m_LT, m_nvalue);
  fclose (f_out);


  return 0;
}

void CGUIPIDlg::OnStart()
{

int position=1,counter=1,count=1,number;
  double start_time, elap_time;
  char filename_in[100], filename_out[100];
  FILE *f_out, *f_in;

   /* sprintf (filename_in, "start.pib");
      f_in = fopen (filename_in, "r");

    number=gets (f_in);
        fclose (f_in);

fclose (f_out);

*/

//      printf("\nPlease type the number of digits of pi you want to compile.\n");
//   printf("\nNumber of Digits = ");
//    scanf("%d",&number);
//    printf("\n\nStart of Digits = ");
//    scanf("%d",&count);

  start_time = (double) clock ();

  UpdateData(TRUE);

  number = m_Stop;
  count = m_Start;

  number = number / 9;
  number = number * 9;

  //count=number+500;

  count = count / 9;
  count = count * 9;


m_CR.Format("%i-%i",count,count+number);
UpdateData(FALSE);
UpdateWindow( );

  if (count <= 0)
  {
  count = 1;
  }
  if (count > 1)
  {
  count++;
  }
//  printf("\nComputing %d digits of pi ...\n\n",number-count);

  counter=count;
  while (counter<number+count)
      {
m_CUR.Format("%i-%i",counter,counter+9);
m_P.SetPos(((counter-count)*100)/number);
UpdateData(FALSE);
UpdateWindow( );
      pseudo_main(counter, start_time, number, count);
      counter=counter+9;
      }

  elap_time = ((double) clock () - (double) start_time) / CLOCKS_PER_SEC;



 // printf("\nTotal calculation done in: %9.2lf seconds.\n",elap_time);

 // printf("\nGenerating output file ...\n");
  start_time = (double) clock ();

  sprintf (filename_out, "pi_%i_%i.txt", count, number);
  f_out = fopen (filename_out, "w");
  if (count == 1)
  {
  fprintf(f_out, "3.");
  }
  counter = count;
  while (counter<number)
      {
      sprintf (filename_in, "%i.pib", counter);
      f_in = fopen (filename_in, "r");
      position = 1;
      while (position<10)
            {
            putc((getc (f_in)),f_out);
            position=position+1;
            }
      counter=counter+9;
      fclose (f_in);

// Next line contributed by Arko Provo Mukherjee, arkoprovo@peacefulaction.org
//      remove (filename_in);

      }

  fclose (f_out);

  elap_time = ((double) clock () - (double) start_time) / CLOCKS_PER_SEC;
  //printf("\n%s generated in: %9.2lf seconds.\n",filename_out,elap_time);

}
0
 
LVL 48

Accepted Solution

by:
AlexFM earned 50 total points
ID: 9887240
There are two ways to make program responsive. Simple way is using DoEvents:

void DoEvents()
{
    MSG msg;
   
    while ( ::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE ) )
    {  
        if ( ::GetMessage(&msg, NULL, 0, 0))
        {
            ::TranslateMessage(&msg);
            ::DispatchMessage(&msg);
        }
        else
        {
            break;
        }
    }
}

Now when you have some long loop call DoEvents from it periodically:

while ( ... )
{
    // some operations
   
    DoEvents();          // here window is redrawn, menu items are handled etc.
}

Another way us using multi-threading. Check out MFC sample MTRECALC.
0
 
LVL 44

Expert Comment

by:Karl Heinz Kremer
ID: 9888200
You can call the DoEvents() function e.g. at the start of your two for lools in the pseudo_main function.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question