1.在OnInitDialog()函数里添加

    m_rectTracker.m_nStyle=CRectTracker::resizeOutside|CRectTracker::solidLine;//设置橡皮筋的线型
	m_rect.left=0;
	m_rect.right=100;
	m_rect.bottom=100;
	m_rect.top=0;

2.在OnPaint()函数里添加

void CModifyRectDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使图标在工作区矩形中居中
		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;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
      
		CDialog::OnPaint();
		CClientDC dc(this);
		//设置边界
		m_rectTracker.m_rect=m_rect;
		//坐标映射;L逻辑 ---> D设备
		dc.LPtoDP(&m_rectTracker.m_rect);
		//画图形的边界
		//if(m_IsDraw) m_rectTracker.Draw(&dc);
		//dc.SelectObject(oldBrush);
		CPen pen(PS_SOLID, 2, RGB(0, 255, 0));//创建画笔为绿色
		dc.SelectObject(&pen);//在dc上放置画笔
		//dc.SetROP2(R2_NOT); 
		dc.SelectStockObject(NULL_BRUSH);//使画出的矩形区域为透明
		 dc.Rectangle(m_rectTracker.m_rect); 
		//dc.DrawEdge(&m_rectTracker.m_rect,EDGE_SUNKEN, BF_RECT);
		 if(m_IsDraw)
         m_rectTracker.Draw(&dc);//若选择了该区域，则显示边框以及8个调整点
		 pen.DeleteObject();
		//DeleteObject(hBrush)；		
	}
}

在这里初始化一个矩形，用画笔将它画在控件上
3.

void CModifyRectDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	//ModifyCursor(point);
	

	int ret=m_rectTracker.HitTest(point);
	if(ret>=0)//判断是否要画调整边框
	{
		m_IsDraw=TRUE;
		CClientDC dc(this);

		InvalidateRect(&m_rectTracker.m_rect);//重绘窗口
		
	}
	else
	{
		m_IsDraw=FALSE;
		CRect rect=m_rectTracker.m_rect;
		InvalidateRect(&rect);
		//Invalidate();
		//Invalidate();
		//OutputDebugString(TEXT("aaa"));
	}

	//此函数会拦截掉鼠标消息,所以要在这个函数后面写鼠标弹起要处理的事件.
	if(m_rectTracker.Track(this,point,false,NULL)) 
	{ 
		//鼠标弹起后才执行下面的程序
		CClientDC   dc(this); 
		CRect rect=m_rect;
		m_rect=m_rectTracker.m_rect; 
		//dc.DPtoLP(&m_rectTracker.m_rect); 
		//Invalidate(TRUE);  
	
		InvalidateRect(&rect,0);
		//Invalidate(0);
		//OutputDebugString(TEXT("bbb"));		
		ClipCursor(NULL);
	}
	else
	{
		//鼠标弹起后执行下面的程序.
		
		ClipCursor(NULL);
		//OutputDebugString(TEXT("ddd"));
	}

	CDialog::OnLButtonDown(nFlags, point);
}

void CModifyRectDlg::OnMouseMove(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值

	
	CDialog::OnMouseMove(nFlags, point);
}

//用这种方法可以自定义光标形状,但是会有光标闪烁.
void CModifyRectDlg::ModifyCursor(CPoint point)
{
	static int CurStyle=-2;
	int ret=m_rectTracker.HitTest(point);
	switch(ret)
	{
	case CRectTracker::hitTopLeft:
	case CRectTracker::hitBottomRight:
		SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZENWSE));
		break;

	case CRectTracker::hitTopRight:
	case CRectTracker::hitBottomLeft:
		SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZENESW));
		break;

	case CRectTracker::hitRight:
	case CRectTracker::hitLeft:
		SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZEWE));
		break;

	case CRectTracker::hitBottom:
	case CRectTracker::hitTop:
		SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZENS));
		break;

	case CRectTracker::hitMiddle:
		
			
			SetCursor(LoadCursor(NULL,IDC_SIZEALL));
		
		break;
	default:
		break;
	}
}
BOOL CModifyRectDlg::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: 在此添加专用代码和/或调用基类
	
	return CDialog::PreCreateWindow(cs);
}

BOOL CModifyRectDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值

	//SetCursor(LoadCursor(NULL,IDC_SIZEALL));

	//这里控制是否改变光标.
	if(m_IsDraw && pWnd==this && m_rectTracker.SetCursor(this,nHitTest))//
	{
		return TRUE;
	}
	return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

4.结果显示如下