How to get the font's index in font file?

App & System Services General
7sDrema
7sDrema OP
Created May ’20
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I'm working on port a application from Linux to macOS, and it need to know current font's index in ttc/otc file.


On Linux, it use fontconfig's FC_Index property to get it.


On macOS, I can use Core Text API to get the CTFontDescriptor or CTFont struct from font's full name, but seems non of them provide the index attribute.


Any advices?

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Apple Staff, Engineer
Engineer OP
Apple
Jun ’20
Apple platforms use a font’s PostScript name as the primary identifier, not the TTC index.
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How to get the font's index in font file?
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