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How to determine if font is unicode?

In my Unicode application I allow the user to change font between an ordinary 8-bit font and Unicode fonts such as Chinese.

How do I determine whether the current font (CFont or LOGFONT) is a Unicode font, i.e., a font that requires 16-bit to store in a file?

Is there a method that can be called on a CFont to determine that it cannot be represented in 8 bits?
1 Solution
Roshan DavisCommented:
find "HOWTO: Translate Unicode Character Codes to TrueType Glyph Indices in Windows 95" in MSDN.

MSDN says

All Microsoft Unicode encodings (Platform ID = 3, Encoding ID = 1) must use Format 4 for their 'cmap' subtable. Microsoft strongly recommends using a Unicode 'cmap' for all fonts. However, some other encodings that appear in current fonts follow:
Platform ID      Encoding ID      Description
3           0           Symbol
3           1           Unicode
3           2            ShiftJIS      
3           3            Big5
3           4            PRC
3           5            Wansung
3           6            Johab

What about using


The GetFontUnicodeRanges function returns information about which Unicode characters are supported by a font. The information is returned as a GLYPHSET structure.

  HDC hdc,         // handle to the device context
  LPGLYPHSET lpgs  // pointer to the glyph set structure
Handle to the device context.
Pointer to a buffer to contain the GLYPHSET structure. If this parameter is NULL, the function returns a pointer to the GLYPHSET structure for the current font.
Return Values
If the function succeeds, it returns a pointer to the font's GLYPHSET structure for the current device context.

If the function fails, it returns zero.

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