The Practical Guide to Multithreading - Part 2

// ParallelSearch_MFCDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ParallelSearch_MFC.h"
#include "ParallelSearch_MFCDlg.h"

#include "RelationalSearchPage.h"
#include "PrimeNumberSearchPage.h"
#include "DivisibilitySearchPage.h"

#include <algorithm>

#ifdef _DEBUG
#define new DEBUG_NEW
#endif







CParallelSearchDlg::CParallelSearchDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CParallelSearchDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CParallelSearchDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_RANDOM_COUNT, m_cCount);
	DDX_Control(pDX, IDC_GEN_PROGRESS, m_cGenProgress);
}

BEGIN_MESSAGE_MAP(CParallelSearchDlg, CDialog)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDOK, &CParallelSearchDlg::OnBnClickedOk)
END_MESSAGE_MAP()


// CParallelSearchDlg message handlers

BOOL CParallelSearchDlg::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

	// Default to 1 million / 10 lakhs
	m_cCount.SetWindowText( _T("1000000"));

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

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<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 function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CParallelSearchDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

struct NumberGenerator
{
	int CurrentNumber;

	int operator()()
	{
		return CurrentNumber++;
	}

};
void CParallelSearchDlg::OnBnClickedOk()
{
	m_gNumberCollection.m_nCount= GetDlgItemInt(IDC_RANDOM_COUNT);

	// Allocate first
	m_gNumberCollection.m_pNumbers = new int[m_gNumberCollection.m_nCount ];

	// Seed random, so that it rand function generates unique random on each run
	srand( static_cast<int> ( time(0) ) );


	// [STL]

	NumberGenerator num_gen;
	num_gen.CurrentNumber = 1;	// Start with 1

	std::generate(m_gNumberCollection.m_pNumbers, 
		m_gNumberCollection.m_pNumbers + m_gNumberCollection.m_nCount, 
		num_gen);		// Would call operator () to get next number


	// Now shuffle it
	std::random_shuffle(m_gNumberCollection.m_pNumbers, 		
		m_gNumberCollection.m_pNumbers + m_gNumberCollection.m_nCount);

	// [STL]


	OnOK();

	CPropertySheet SearchSheet( _T("Parallel Search"));;


	CRelationalSearchPage RelationSearchPage;
	CPrimeNumberSearchPage PrimeNumberSearchPage;
	CDivisibilitySearchPage DivisibilitySearchPage;

	SearchSheet.AddPage(&RelationSearchPage);
	SearchSheet.AddPage(&PrimeNumberSearchPage);
	SearchSheet.AddPage(&DivisibilitySearchPage);

	SearchSheet.m_psh.dwFlags |= PSH_NOAPPLYNOW;

	SearchSheet.DoModal();
}