if(Flags & FCLOSEBUTTON)          //绘制关闭按钮
{
DeleteObject(LeftLine);
LeftLine.LoadBitmap(IDB_CLOSEBT);
//获取位图大小
LeftLine.GetObject(sizeof(bitinfo),&bitinfo);
OldObj = memDC.SelectObject(&LeftLine);
x = bitinfo.bmiHeader.biWidth;        //获取位图宽
y = bitinfo.bmiHeader.biHeight;        //获取位图高
WindowDC.StretchBlt(m_CloseRect.left,m_CloseRect.top,m_CloseRect.right,
m_CloseRect.bottom,&memDC,0,0,x,y,SRCCOPY);   //绘制关闭按钮
memDC.SelectObject(OldObj);
LeftLine.Detach();
}  

CPoint pos(30,1);
m_MinRect.CopyRect(CRect(m_RTitleRc.left+pos.x,(m_TitleDrawHeight 
+2*m_BorderHeight -m_ButtonHeight)/2+pos.y,m_ButtonWidth,
m_ButtonHeight)); //最小化按钮区域
pos.x = 55;
m_MaxRect.CopyRect(CRect(m_RTitleRc.left+pos.x,(m_TitleDrawHeight
+2*m_BorderHeight -m_ButtonHeight)/2+pos.y,m_ButtonWidth,
m_ButtonHeight)); //最大化按钮区域
pos.x = 80;
m_CloseRect.CopyRect(CRect(m_RTitleRc.left+pos.x,(m_TitleDrawHeight
+2*m_BorderHeight -m_ButtonHeight)/2+pos.y,m_ButtonWidth,
m_ButtonHeight)); //关闭按钮区域
Invalidate();                //刷新窗口

void CCaptureDlg::OnNcMouseMove(UINT nHitTest, CPoint point) 
{
CRect tempMin,tempMax,tempClose,ClientRect;
CWindowDC WindowDC (this);          //CWindowDC类对象
CDC memDC;
memDC.CreateCompatibleDC(&WindowDC);      //创建内存设备环境
BITMAPINFO bInfo; 
CBitmap LeftLine;
int x,y;
GetWindowRect(ClientRect); 
tempMin.CopyRect(CRect(m_MinRect.left+ ClientRect.left,ClientRect.top
+m_MinRect.top,m_MinRect.right+m_MinRect.left+ ClientRect.left,
m_MinRect.bottom+m_MinRect.top+ClientRect.top));   //设置最小化按钮区域
tempMax.CopyRect(CRect(m_MaxRect.left+ ClientRect.left,ClientRect.top
+m_MaxRect.top,m_MaxRect.right+m_MaxRect.left+ ClientRect.left,
m_MaxRect.bottom+m_MaxRect.top+ClientRect.top));   //设置最大化按钮区域
tempClose.CopyRect(CRect(m_CloseRect.left+ ClientRect.left,ClientRect.top
+m_CloseRect.top,m_CloseRect.right+m_CloseRect.left+ ClientRect.left,
m_CloseRect.bottom+m_CloseRect.top+ClientRect.top));   //设置关闭按钮区域
if(tempMin.PtInRect(point))      //鼠标在最小化按钮上移动时，更改按钮显示的位图
{
if(m_ButtonState != bsMin)
{
LeftLine.LoadBitmap(IDB_MINHOTBT)   ;  //加载最小化按钮位图资源
LeftLine.GetObject(sizeof(bInfo),&bInfo);
x = bInfo.bmiHeader.biWidth;       //获得位图宽度
y = bInfo.bmiHeader.biHeight;       //获得位图高度
memDC.SelectObject(&LeftLine);
WindowDC.StretchBlt(m_MinRect.left,m_MinRect.top,m_MinRect.right,
m_MinRect.bottom,&memDC,0,0,x,y,SRCCOPY);  //绘制最小化按钮
m_IsDrawForm = FALSE;
m_ButtonState = bsMin; 
LeftLine.Detach();
}
}
else if(tempMax.PtInRect(point))
{
if(m_ButtonState!=bsMax && m_ButtonState!=bsRes)
{
LeftLine.LoadBitmap(IDB_MAXHOTBT);    //加载最大化按钮位图资源
LeftLine.GetObject(sizeof(bInfo),&bInfo);
x = bInfo.bmiHeader.biWidth;       //获得位图宽度
y = bInfo.bmiHeader.biHeight;       //获得位图高度
memDC.SelectObject(&LeftLine);
WindowDC.StretchBlt(m_MaxRect.left,m_MaxRect.top,m_MaxRect.right,
m_MaxRect.bottom,&memDC,0,0,x,y,SRCCOPY);  //绘制最大化按钮
m_IsDrawForm = FALSE;
if (m_IsMax)
{
m_ButtonState = bsMax;
}
else
{
m_ButtonState = bsRes;
}
LeftLine.Detach();
}
}
else if(tempClose.PtInRect(point))
{
if(m_ButtonState != bsClose)
{
LeftLine.LoadBitmap(IDB_CLOSEHOTBT);    //加载关闭按钮位图资源
LeftLine.GetObject(sizeof(bInfo),&bInfo);
x = bInfo.bmiHeader.biWidth;       //获得位图宽度
y = bInfo.bmiHeader.biHeight;       //获得位图高度
memDC.SelectObject(&LeftLine);
WindowDC.StretchBlt(m_CloseRect.left,m_CloseRect.top,m_CloseRect.right,
m_CloseRect.bottom,&memDC,0,0,x,y,SRCCOPY);  //绘制关闭按钮
m_IsDrawForm = FALSE;
m_ButtonState = bsClose;
LeftLine.Detach(); 
}
}
else
{
if(m_IsDrawForm == FALSE)
{
if(m_ButtonState == bsMin)
DrawDialog( FMINBUTTON);      //重绘最小化按钮
else if(m_ButtonState == bsClose)
DrawDialog( FCLOSEBUTTON);     //重绘关闭按钮
else if(m_ButtonState == bsMax || m_ButtonState==bsRes)
DrawDialog( FMAXBUTTON);     //重绘最大化按钮
}
m_ButtonState = bsNone;
}
LeftLine.DeleteObject();
ReleaseDC(&memDC);
CDialog::OnNcMouseMove(nHitTest, point);
}

void CDrawDialogDlg::OnNcLButtonDown(UINT nHitTest, CPoint point) 
{
switch (m_ButtonState)
{
case bsClose:             //关闭窗口
{
OnCancel();
}
break;
case bsMin:             //最小化窗口
{
ShowWindow(SW_SHOWMINIMIZED); 
}
break;
case bsMax:             //最大化窗口
{
m_ButtonState = bsMax;
ShowWindow(SW_SHOWMAXIMIZED);
m_IsMax = FALSE;
}
break;
case bsRes:             //恢复窗口
{
ShowWindow(SW_RESTORE);
m_IsMax = TRUE;
}
break;
} 
CDialog::OnNcLButtonDown(nHitTest, point);
}

 BOOL CDrawDialogDlg::OnNcActivate(BOOL bActive) 
{
OnPaint() ;         //重绘窗口
return TRUE;
}

void CDrawDialogDlg::OnNcPaint() 
{

}