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 />