内存泄露？？

哪里有内存泄露或者是出了其他问题呢？为什么运行后内存占有量越来越大CRect rect;
  CWnd* pWnd = GetDlgItem(IDC_CLIENT); 
pWnd->GetClientRect(&rect); //获得对话框上的picture的窗口句柄 
// 指针 
pDC = pWnd->GetDC(); 
pWnd->Invalidate(); 
pWnd->UpdateWindow(); 
CBitmap memBitmap; 
CBitmap* pOldBmp = NULL;
//创建内存绘图设备 
memDC.CreateCompatibleDC(pDC);               
memBitmap.CreateCompatibleBitmap(pDC,rect.right,rect.bottom); 
pOldBmp = memDC.SelectObject(&memBitmap); 
memDC.BitBlt(rect.left,rect.top,rect.right,rect.bottom,pDC,0,0,SRCCOPY); 
//自定义绘图函数
DrawWave(&memDC);  
//把内存绘图拷贝到屏幕 
pDC->BitBlt(rect.left,rect.top,rect.right,rect.bottom,&memDC,0,0,SRCCOPY); 
memDC.SelectObject(pOldBmp); 
memDC.DeleteDC(); 
memBitmap.DeleteObject();
void CDQADlg::DrawWave(CDC *mDC)
{
CRect rect1;
CWnd* pWnd = GetDlgItem(IDC_CLIENT); 
pWnd->GetClientRect(&rect1); 
// mDC->SelectClipRgn(&rgn); //选择区域
CBrush brushNewBrush(RGB(0,150,200));
CBrush *pbrushOldBrush=mDC->SelectObject(&brushNewBrush);
mDC->Rectangle(m_rectClient); //将客户区背景设置
mDC->Rectangle(rect1); //覆盖原来的图形，这里最好可以清除掉
const int xOrg=rect1.left+200;
const int yOrg=rect1.bottom-342;
const int xMax=m_rectClient.Width()+170;
const int yMin=m_rectClient.Height()+20;
const int iPt=200; //200个点 
if (m_i<200)
m_i++;
for (int ii=0;ii<iPt;ii++)
// {
dbXdata[ii]=ii*1.25+xOrg; //给X坐标赋值
// dbYdata[ii]=ii*6.4;
// // dbYdata[ii]=6.4*m_DoubeData[ii];
// dc.LineTo(int(dbXdata[ii]),int(dbYdata[ii]));
// UpdateData(true);
// }
// dc.MoveTo(dbXdata[0],int(dbYdata[0]));
// Beep(1000,50);
if (m_IntPolarity==0) //双极性坐标画法
{
mDC->MoveTo(xOrg-190,55); //画轴
mDC->LineTo(xMax-180,55);
}
else
{
mDC->MoveTo(xOrg-190,100); //画轴
mDC->LineTo(xMax-180,100);
}
mDC->MoveTo(xOrg-190,55);
mDC->LineTo(xOrg-190,100);
mDC->MoveTo(xOrg-190,55);
mDC->LineTo(xOrg-190,5);
CPen penNewPen(PS_SOLID,1,RGB(150,255,0));
CPen *ppenOldPen=mDC->SelectObject(&penNewPen);
mDC->MoveTo(int(dbXdata[0])-190,55+m_IntMyData[0]); //起点
for (ii=0;ii<m_i;ii++)
//dc.LineTo(int(dbXdata[ii]),int(dbYdata[ii]));
mDC->LineTo(int(dbXdata[ii])-190,55+m_IntMyData[ii]);
}