codepoint

问题 I have seen Questions and Answers about obtaining the code point number of a Unicode character in Java. For example, the Question How can I get a Unicode character's code?. But I want the opposite: given an integer number, how do I get text of that character assigned to that code point number? The char primitive data type is of no use, being limited to only the Basic Multilingual Plane of the Unicode character set. That plane represents approximately the first 64,000 characters defined in

问题 I have seen Questions and Answers about obtaining the code point number of a Unicode character in Java. For example, the Question How can I get a Unicode character's code?. But I want the opposite: given an integer number, how do I get text of that character assigned to that code point number? The char primitive data type is of no use, being limited to only the Basic Multilingual Plane of the Unicode character set. That plane represents approximately the first 64,000 characters defined in

问题 It appears that the red heart emoji (❤️) "\u2764\uFE0F" requires two Unicode codepoints, specifically Heavy Black Heart followed by a Variation Selector. However, blue 💙, green 💚, yellow 💛, and purple 💜 each have their own single codepoint. Why is red so different? 回答1: For historical reasons. Originally, there was only U+2764 HEAVY BLACK HEART which the first applications that supported Emojis decided to render as a red heart. These early applications always rendered U+2764 as Emoji. Later

问题 It appears that the red heart emoji (❤️) "\u2764\uFE0F" requires two Unicode codepoints, specifically Heavy Black Heart followed by a Variation Selector. However, blue 💙, green 💚, yellow 💛, and purple 💜 each have their own single codepoint. Why is red so different? 回答1: For historical reasons. Originally, there was only U+2764 HEAVY BLACK HEART which the first applications that supported Emojis decided to render as a red heart. These early applications always rendered U+2764 as Emoji. Later

问题 In C++ there is a way to cast a char to int and get the ascii value in return. Is there such a way to do the same with a qchar? Since unicode supports so many characters and some of them are actually looking alike, it is sometimes hard to tell what one is dealing with. An explicit code point or a number that can be used to get such would be very helpful. I searched a the web and this site for a solution but so far no luck, Qt documentation isn't much of help either, unless I'm overlooking

问题 Unicode categorizes characters as belonging to a script, such as the Latin script. How do I test whether a particular character (code point) is in a particular script? 回答1: Java represents the various Unicode scripts in the Character.UnicodeScript enum, including for example Character.UnicodeScript.LATIN. These match the Unicode Script Properties. You can test a character by submitting its code point integer number to the of method on that enum. int codePoint = "a".codePointAt( 0 ) ;

问题 Reading the Wikipedia article on UTF-8, I've been wondering about the term overlong . This term is used various times but the article doesn't provide a definition or reference for its meaning. I would like to know if someone can explain the term and its purpose. 回答1: It's an encoding of a code point which takes more code units than it needs to. For example, U+0020 is represented in UTF-8 by the single byte 0x20 . If you decode the two bytes 0xc0 0xa0 in the normal fashion, you'll still end up

问题 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

问题 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

问题 I need to find out the names for Unicode characters when the user enters the number for it. An example would be to enter 0041 and get given "Latin Capital Letter A" as the result. 回答1: As far as I know, there isn't a standard way to do this. You could probably parse the UnicodeData.txt file to get this information. 回答2: Here should be what you're looking for. The first array is simply http://unicode.org/Public/UNIDATA/Index.txt with replacing newlines with | ; // this mess.. var unc = "A WITH