codepoint

It seems that SQL Server uses Unicode UCS-2 , a 2-byte fixed-length character encoding, for nchar/nvarchar fields. Meanwhile, C# uses Unicode UTF-16 encoding for its strings (note: Some people don't consider UCS-2 to be Unicode, but it encodes all the same code points as UTF-16 in the Unicode subset 0-0xFFFF, and as far as SQL Server is concerned, that's the closest thing to "Unicode" it natively supports in terms of character strings.) While UCS-2 encodes the same basic code points as UTF-16 in the Basic Multilingual Plane (BMP), it doesn't reserve certain bit patterns that UTF-16 does to

I have an application that is supposed to deal with all kinds of characters and at some point display information about them. I use Qt and its inherent Unicode support in QChar, QString etc. Now I need the code point of a QChar in order to look up some data in http://unicode.org/Public/UNIDATA/UnicodeData.txt , but QChar's unicode() method only returns a ushort (unsigned short), which usually is a number from 0 to 65535 (or 0xFFFF). There are characters with code points > 0xFFFF, so how do I get these? Is there some trick I am missing or is this currently not supported by Qt/QChar? Each QChar

Given a String string in Java, does string.codePoints().toArray().length reflect the length of the String in terms of the actual characters that a human would find meaningful? In other words, does it smooth over escape characters and other artifacts of encoding? Edit By "human" I kind of meant "programmer" as I would imagine most programmers would see \r\n as two characters, ESC as one character, etc. But now I see that even the accent marks get atomized so it doesn't matter. No. For example: Control characters (such as ESC, CR, NL, etcetera) will not be removed. These have distinct codepoints

Why do Unicode code points appear as U+ <codepoint> ? For example, U+2202 represents the character ∂ . Why not U- (dash or hyphen character) or anything else? The characters “U+” are an ASCIIfied version of the MULTISET UNION “⊎” U+228E character (the U-like union symbol with a plus sign inside it), which was meant to symbolize Unicode as the union of character sets. See Kenneth Whistler’s explanation in the Unicode mailing list . Jim DeLaHunt The Unicode Standard needs some notation for talking about code points and character names. It adopted the convention of "U+" followed by four or more

Splitting a JavaScript string into "characters" can be done trivially but there are problems if you care about Unicode (and you should care about Unicode). JavaScript natively treats characters as 16-bit entities ( UCS-2 or UTF-16 ) but this does not allow for Unicode characters outside the BMP (Basic Multilingual Plane) . To deal with Unicode characters beyond the BMP, JavaScript must take into account " surrogate pairs ", which it does not do natively. I'm looking for how to split a js string by codepoint, whether the codepoints require one or two JavaScript "characters" (code units).

Recently I ran into codePointAt method of String in Java. I found also a few other codePoint methods: codePointBefore , codePointCount etc. They definitely have something to do with Unicode but I do not understand it. Now I wonder when and how one should use codePointAt and similar methods. Short answer: it gives you the Unicode codepoint that starts at the specified index in String . i.e. the "unicode number" of the character at that position. Longer answer: Java was created when 16 bit (aka a char ) was enough to hold any Unicode character that existed (those parts are now known as the Basic