The GetOutlineTextMetrics API

The OUTLINETEXTMETRIC structure includes a TEXTMETRIC structure which includes some TCHAR fields. A TCHAR can compile to a 16 bit character or a 8 bit character (depending on whether UNICODE is defined). The C# version of the TEXTMETRIC structure on PInvoke.net assumes that the TCHAR is a 16 bit character and when you retrieve a TEXTMETRIC structure with GetTextMetrics you do get a TEXTMETRIC structure with 16 bit characters. However, when you retrive an OUTLINETEXTMETRIC structure with GetOutlineTextMetrics the included TEXTMETRIC structure appears to have 8 bit characters. (These observations were with Windows XP and might not hold true for other operating systems or all fonts.)