How to resize a view by calling SetScaleToFitSize()?

I want have the display in a CScrollView-derived view resize correspondingly when I resize the child window. I have called SetScaleToFitSize() in my routine as following:

void CMyView::OnInitialUpdate()
{
      CSize size = GetDocument()->GetSize();
      CClientDC dc(NULL);
      size.cx = MulDiv(size.cx, dc.GetDeviceCaps(LOGPIXELSX), 100);
      size.cy = MulDiv(size.cy, dc.GetDeviceCaps(LOGPIXELSY), 100);
//      SetScrollSizes(MM_TEXT, size);
      GetParentFrame()->RecalcLayout();
      SetScaleToFitSize(size);
}

The only result is the scroll bar disabled. The picture dose not change. When I resize the window, the picture dose not resize. Is there any other thing I have to do?

Further, I want the view and page is Landscape by default. How can I do that?
wenfeiAsked:
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wenfeiAuthor Commented:
Edited text of question
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AlFaCommented:
Size must be teh size of your document in logical units.
SetScaleToFitSize will change the scale of your view in orderto display the whole doc. you won't have scrolllbar!

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wenfeiAuthor Commented:
I inserted dc.LPtoDP(&size). Before calling this function, size={767, 1055}, after calling, size={767, 1013}. And the display doesn't change. I thinks I am not on the right way. Could tell me the detail.
Thanks in advance.

void CMyView::OnInitialUpdate()
{
      CSize size = GetDocument()->GetSize();
      CClientDC dc(NULL);
      size.cx = MulDiv(size.cx, dc.GetDeviceCaps(LOGPIXELSX), 100);
      size.cy = MulDiv(size.cy, dc.GetDeviceCaps(LOGPIXELSY), 100);
//      SetScrollSizes(MM_TEXT, size);
      dc.LPtoDP(&size);
      GetParentFrame()->RecalcLayout();
      SetScaleToFitSize(size);
}

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