我使用字体对话框，GetLogFont(&logfont)，logfont.lfHeight为负，如何转化为毫米？！

Question

我使用字体对话框，GetLogFont(&logfont)，logfont.lfHeight为负，如何转化为毫米？！

Answer 1

http://www.sdlgame.com/reference/Programming%20Windows/17.htm逻辑字体结构

Answer 2

CSize SizeExt;
strCommand = "¿ËÀ­ÂêÒÀÊÐÍÁµØÐÅϢϵͳ"; dc.SetMapMode(MM_TEXT); // +y = down
SizeExt = dc.GetWindowExt();
dc.SetWindowExt(500,550);
dc.SetViewportExt(rect.right, rect.bottom);
dc.SetViewportOrg(0, 0);// LOGFONT logfont;
CFont m_biggerFont;
// memset(&logfont, 0, sizeof(logfont));
// logfont.lfHeight = 40;
// logfont.lfWeight = FW_BOLD;
// CString szFont;
// szFont.LoadString(IDS_FONT_NAME);           // TrueType font
// lstrcpy(logfont.lfFaceName, strCommand);
// VERIFY(m_biggerFont.CreateFontIndirect(&logfont));
// SetFont(&m_biggerFont);
// InputEdit().SetFont(&m_biggerFont);
m_biggerFont.CreateFont(0.13630*rect.Height(), 0, 0, 0, 900, FALSE, FALSE, 0,
                     DEFAULT_CHARSET, OUT_DEFAULT_PRECIS,
                     CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
                     DEFAULT_PITCH | FF_SWISS, "Arial"); // not TrueType
// dc.SelectObject(&m_biggerFont);
CFont* pOldFont = dc.SelectObject(&m_biggerFont);
TEXTMETRIC tm;
char       szFaceName[100]; dc.GetTextMetrics(&tm);
dc.GetTextFace(99, szFaceName);
TRACE("font = %s, tmHeight = %d, tmInternalLeading = %d,"
  " tmExternalLeading = %d\n", szFaceName, tm.tmHeight,
tm.tmInternalLeading, tm.tmExternalLeading);
// TraceMetrics(dc(this));

// dc.SetTextAlign(TA_BASELINE | TA_CENTER);
dc.SetTextColor(RGB(255, 0, 0));
dc.SetBkMode(TRANSPARENT);
dc.TextOut(rect.left+rect.Width()*0.015, rect.top+rect.Height()*0.40981067, strCommand);
TextRect = rect;
TextRect.left = rect.left+rect.Width()/2-80;
TextRect.top = rect.top+rect.Height()/2-20;
TextRect.right = TextRect.left+260;
TextRect.bottom = TextRect.top + 80;
// dc.DrawText(strCommand, TextRect,
// DT_SINGLELINE | DT_CENTER | DT_VCENTER);
dc.SelectObject(pOldFont);