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how to determine avail chars in a font?

Subject: how to determine avail chars in a font?
From: Edward de Jong <email@hidden>
Date: Sun, 2 Oct 2005 13:52:21 -0300
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I have solved many of my problems. It appears that ATSUDrawText will not draw into 8-bit GWorlds under OSX (however it does work on OS 9).

The problem I am having now is that for a given ATSU font id, i want to draw some sample letters. I tried just using 'abcd' but for many foreign fonts they don't contain abcd, and so you get the infamous missing character boxes.

How do I determine which characters are valid for a font? I see that Adobe InDesign does it for their character palette screen, where they show all the valid characters they can find. How does one determine the availability of a particular code? There are after all 65000 unicode values and this sounds slow to build.

A perfect example of this is the font "Zapf Dingbats" which has no mapping for a, b, c, but ITC Zapf Dingbats (an old postscript font I have) does map a,b,c.

edj

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