C / C++ / MFC

BobInNJ wrote:

Given a seed, two different random number generation algorithms will return different random values.

BobInNJ wrote:

Worse yet, all random number generators have the property have after a certain number of random numbers being generated, they repeat themselves.

BobInNJ wrote:

The length of this sequence is called the period.

BobInNJ wrote:

Over the years, there has been a fair amount of theory on how to develop a good random number generator. I believe the one that comes with the Microsoft C++ compiler is a good one and it has a very long period. I do not know about the one that comes with the Java compiler except that it almost certainly uses a slightly different algorithm and therefore it will have a different period.

BobInNJ wrote:

If you need the same results on both C++ and Java, I strongly recommend that you implement your own random number generator.

m_brush.CreateSolidBrush(RGB(255, 255, 255));

[Delegates]      [Virtual Desktop]      [Tray Me !]

-Malli...!

class CMeiTengDlg: public CDialog
{
...
//Add the member variable.
protected:
 CBrush m_objMyBrush;

...
};

BOOL CMyDlg::OnInitDialog()
{
 ...
//initialize it with default brush color (back color)
 m_objMyBrush.CreateSolidBrush(RGB(255, 255, 255)); // color white brush
 ...
}

BOOL CMyDlg::DistroyWindow()
{
//delete it while distroying the dialog.
  m_objMyBrush.DeleteObject();
}

HBRUSH CAboutDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
/*
** No need to do this!
**
** HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
*/

/*
** Return your brush.
*/
return m_objMyBrush;
}

void CMeiTengDlg::OnBnClickedChangebkcolor()
{
	// TODO: Add your control notification handler code here
	CColorDialog dlg; 
	if (dlg.DoModal() == IDOK) 
		COLORREF color=dlg.GetColor(); 
	//change my background color of dialog code here
	changbackground(color);
}

//probably this is what you were searching for
void CMeiTengDlg::changbackground(COLORREF color)
{
	//change the brush color
	m_objMyBrush.DeleteObject();
	m_objMyBrush.CreateSolidBrush( color );
	Invalidate(TRUE);
}

[Delegates]      [Virtual Desktop]      [Tray Me !]

-Malli...!

c:\documents and settings\zhiyuan li\desktop\meiteng\meiteng\meitengdlg.cpp(163) : error C4716: 'CMeiTengDlg::DistroyWindow' : must return a value<br />
Build log was saved at "file://c:\Documents and Settings\ZhiYuan Li\Desktop\MeiTeng\MeiTeng\Debug\BuildLog.htm"<br />
MeiTeng - 1 error(s), 0 warning(s)

BOOL CMeiTengDlg::OnDestroyWindow()<br />
{<br />
	//delete it while distroying the dialog.  <br />
	m_objMyBrush.DeleteObject();<br />
	return TRUE;<br />
}<br />
<br />
<br />
HBRUSH CMeiTengDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)<br />
{<br />
	<br />
	return m_objMyBrush;<br />
}<br />
<br />
void CMeiTengDlg::SetBackgroundColor(COLORREF color)<br />
{<br />
	m_objMyBrush.DeleteObject();	<br />
	m_objMyBrush.CreateSolidBrush( color );	<br />
	<br />
   //redraw<br />
   Invalidate(TRUE);<br />
}<br />
<br />
void CMeiTengDlg::OnBnClickedChangebkcolor()<br />
{<br />
	// TODO: Add your control notification handler code here<br />
	CColorDialog dlg;<br />
	if (dlg.DoModal() == IDOK) <br />
		color=dlg.GetColor(); <br />
	//change my background color of dialog code here<br />
	SetBackgroundColor(color);<br />
}<br />

// MeiTengDlg.h : header file
//

#pragma once
#include "afxwin.h"


// CMeiTengDlg dialog
class CMeiTengDlg : public CDialog
{
// Construction
public:
	CMeiTengDlg(CWnd* pParent = NULL);	// standard constructor
	void SetBackgroundColor(COLORREF color);
	
// Dialog Data
	enum { IDD = IDD_MEITENG_DIALOG };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support
	

// Implementation
protected:
	HICON m_hIcon;
	//CBrush m_brush;
	//COLORREF m_crBackGnd;
	CBrush m_objMyBrush;
	COLORREF  color;


	// Generated message map functions
	virtual BOOL OnInitDialog();
	virtual BOOL OnDistroyWindow();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();

	afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
		DECLARE_MESSAGE_MAP()
public:
	
	CComboBox m_pComboBox;
	//afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
	afx_msg void OnBnClickedChangebkcolor();
	
	 
	
};

// MeiTengDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MeiTeng.h"
#include "MeiTengDlg.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CMeiTengDlg dialog




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

void CMeiTengDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_BITMAP, m_pComboBox);
//	DDX_Control(pDX, IDC_Enjoystatic, m_pEnjoyStatic);
}

BEGIN_MESSAGE_MAP(CMeiTengDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	
	
	ON_BN_CLICKED(IDC_ChangeBKColor, &CMeiTengDlg::OnBnClickedChangebkcolor)
END_MESSAGE_MAP()


// CMeiTengDlg message handlers

BOOL CMeiTengDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	m_objMyBrush.CreateSolidBrush(RGB(255, 255, 255)); // color white brush


	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// 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
}

void CMeiTengDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// 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 CMeiTengDlg::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 CMeiTengDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

BOOL CMeiTengDlg::OnDistroyWindow()
{
	//delete it while distroying the dialog.  
	m_objMyBrush.DeleteObject();
	return CDialog::DestroyWindow(); 
}


HBRUSH CMeiTengDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	
	return m_objMyBrush;
}

void CMeiTengDlg::SetBackgroundColor(COLORREF color)
{
	m_objMyBrush.DeleteObject();	
	m_objMyBrush.CreateSolidBrush( color );	
	
   //redraw
   Invalidate(TRUE);
}

void CMeiTengDlg::OnBnClickedChangebkcolor()
{
	// TODO: Add your control notification handler code here
	CColorDialog dlg;
	if (dlg.DoModal() == IDOK) 
		color=dlg.GetColor(); 
	//change my background color of dialog code here
	SetBackgroundColor(color);
}