为什么我的继承了CScrollView的类在显示图像之后没有那个滚轴呀？？？

Question

我写了一个继承CScrollView的类
能显示图像
但我在OnUpdate处进行SetScrollSizes时出错并且view的右边和下面没有滚轴why?????

Answer 1

没有滚轴我知道是怎么回事了
但在OnUpdate函数中还是有错，代码如下： switch (lHint)
{
case WM_USER_NEWIMAGE:
{
m_tracker.m_rect = CRect(0,0,0,0); CWstArchivesDoc* pDoc = GetDocument();
CxImage*  ima  = pDoc->GetImage();
if (ima) 
{
int px=GetScrollPos(SB_HORZ);
int py=GetScrollPos(SB_VERT);
CSize sz(GetTotalSize());
int x=(int)(ima->GetWidth()*pDoc->GetZoomFactor());
int y=(int)(ima->GetHeight()*pDoc->GetZoomFactor());
SetScrollSizes(MM_TEXT, CSize(x,y));///出错
CSize sz2(GetTotalSize()); CWnd* pFrame=GetParentFrame();
RECT rClient;
pFrame->GetClientRect(&rClient); if (sz.cx!=0 && sz.cy!=0)
{
if (x > rClient.right) 
SetScrollPos(SB_HORZ,sz2.cx*px/sz.cx); 
else  
SetScrollPos(SB_HORZ,0);
if (y > rClient.bottom) 
SetScrollPos(SB_VERT,sz2.cy*py/sz.cy); 
else 
SetScrollPos(SB_VERT,0);
} if (!(pFrame->IsIconic()||pFrame->IsZoomed())){
RECT rMainCl,rFrame,rMainFr;
((CMainFrame *)(AfxGetApp()->m_pMainWnd))->GetClientRect(&rMainCl);
((CMainFrame *)(AfxGetApp()->m_pMainWnd))->GetWindowRect(&rMainFr);
pFrame->GetWindowRect(&rFrame);
pFrame->SetWindowPos(0,0,0,
(4+rFrame.right-rFrame.left-rClient.right+rClient.left)+
min(rMainCl.right-(rFrame.left-rMainFr.left+12),x),
(4+rFrame.bottom-rFrame.top-rClient.bottom+rClient.top)+
min(rMainCl.bottom-(rFrame.top-rMainFr.top+12),y),
SWP_NOMOVE|SWP_NOZORDER);
//ResizeParentToFit(1);
} if (!ima->SelectionIsValid()) 
KillTimer(1);#ifdef VATI_EXTENSIONS
ima->SetJpegQuality(theApp.m_optJpegQuality);
#endif
pDoc->m_hmax = 0;
} break;
}
default:
{
CWstArchivesDoc* pDoc = GetDocument();
if (pDoc){
CxImage*  ima  = pDoc->GetImage();
if (ima){
if (pDoc->GetStretchMode()) 
SetScrollSizes(MM_TEXT, CSize(0,0));
else 
SetScrollSizes(MM_TEXT,CSize((int)(ima->GetWidth()*pDoc->GetZoomFactor()),
  (int)(ima->GetHeight()*pDoc->GetZoomFactor())));
}
}
}
}
CScrollView::OnUpdate(pSender, lHint, pHint);