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MFC

hi, everyone!
I am wondering that: are there any differences between nHeight field in CreateFont method of CFont class and lfHeight field of LOGFONT structure? Because when I create a font by 2 ways:
1,

//other codes
CFont myFont;
myFont.CreateFont(m_iSize, 0, 0, 0, 400, m_bItalic, m_bUnder, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH|FF_SWISS, m_strFont);
//other codes

2,

//other codes
CFontDialog fontDlg;
int iOption = fontDlg.DoModal();
if (iOption!=IDOK)
{
	return;
}
LOGFONT logFont;
fontDlg.GetCurrentFont(&logFont);
CFont myFont;
myFont.CreateFontIndirect(&logFont);
//other codes

HERE: certainly I must pass m_iSize, m_bItalic, bUnder, m_strFont equals to the selection in FontDialog. But 2 fonts I received are different, at least is its size.
Please explain for me!

Thanks so much!