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mysql varchar(45) utf8mb4_general_ci 可以存多少个汉字

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1.存储单位 MySQL在5版本以后，varchar(45)，指的是45个字符，可以存放45个汉字，或者45个英文字母（一个UTF8汉字和一个英文字母一样，都占用1个字符）。 MySQL在4版本以前，varchar(45)，指的是45个字节，可以存放15个汉字，或者45个英文字母（一个UTF8汉字占用3个字节，一个英文字母占用1个字节）。 2.字符编码在UTF-8编码中，一个字符占用三个字节的存储空间；而utf8mb4是utf8的一个升级扩展（在mysql5.5.3以后才支持的），一个字符占用四个字节的存储空间。emoji一个表情占用了4个字节，所以必须使用utf8mb4编码格式。所以mysql varchar(45) utf8mb4_general_ci 如果在mysql5及以后的版本，可以存45个汉字，或者可以存45个emoji表情，或者可以存45个英文。如果在mysql5.0 以前的版本是不支持utf8mb4_general_ci，假设编码是utf8_general_ci，能存15个汉字，或者可以存45个英文，而emoji表情是无法存进去的（emoji占用4个字节）。来源： oschina 链接： https://my.oschina.net/stupidboyblog/blog/3146109

iOS emoji messed up in UILabel

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问题 I am using a open source UILabel subclass STTweetLabel v2.22 (Github) and trying to show emoji in the label. During my test it seems that the code can handle most cases correctly but sometimes I see this: Just wondering why this could happen, and what could be a possible fix I should look into.. Thanks! -- Update (adding code used to decode strings from server) -- NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding]; NSString *decoded = [[NSString alloc] initWithData:data encoding

Presenting just a subset of emojis on the keyboard on iOS apps

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问题 I am making an app where I use the "People" emojis as avatar faces and the "Food and drink" emojis for, well, food and drink icons. I would like to use the regular keyboard for presenting the emojis for user input, but I would like to present only these two categories of emojis (and even so, each category would be presented in a different context). I am working with iOS 8, Xcode 6.3 and Swift. Can I configure the regular keyboard so that it only shows a subset of emojis which I define? If not

Python 2.7: detect emoji from text

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问题 I'd like to be able to detect emoji in text and look up their names. I've had no luck using unicodedata module and I suspect that I'm not understanding the UTF-8 conventions. I'd guess that I need to load my doc as as utf-8, then break the unicode "strings" into unicode symbols. Iterate over these and look them up. #new example loaded using pandas and encoding UTF-8 'A man tried to get into my car\U0001f648' type(test) = unicode import unicodedata as uni uni.name(test[0]) Out[89]: 'LATIN

How to render an emoji with libgdx

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问题 I have loaded a font with emoji support and I am trying to render a string with emoji's with libgdx. However, it renders the text, but not the emojis. Code Load Font FileHandle fontFile = Gdx.files.internal("path/to/file.ttf"); FreeTypeFontGenerator g = new FreeTypeFontGenerator(fontFile); FreeTypeFontGenerator.FreeTypeFontParameter p = new FreeTypeFontGenerator.FreeTypeFontParameter(); // Some config here with p BitmapFont emojiFont= g.generateFont(p); Render Font public static void

How to insert emoji into NSTextView without shifting the line down?

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问题 How do I insert emoji into an NSTextView without moving the line down? If I insert an emoji character into an NSTextView , the whole line will shift down a couple pixels. If I remove the emoji character, it will move back up to its original position. On the other hand, if I insert an emoji into an NSTextField , the line doesn't move at all, even when the text in the line is the same font and size as it was in the NSTextView . You can see this behavior in TextEdit. When you are typing in the

How to send and receive Emoji to webservice [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . I need to use emoji for chat in my android application.I'm using this library https://github.com/rockerhieu/emojicon to get emoji, its perfectly shows emoji but how can I send/receive to the server for my chat application. Thanks- This is my code for getting Emoji with the help of

Access most recently used emojis list in iOS

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问题 In iOS, in the native Emoji keyboard, you can see your most recently used Emojis. I would like to know if it is possible to get the data on those Emojis (which is app-independent) from inside my app. My goal is to display the most used emoji, given a user, in my app. 回答1: If you just want an Emoji selector you could use/modify libraries like SYEmojiPopover or AGEmojiKeyboard which allows you to have full control on the output without messing with the iOS internals (albeit the "recents" list

How to count grapheme clusters or “perceived” emoji characters in Java

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问题 I'm looking to count the number of perceived emoji characters in a provided Java string. I'm currently using the emoji4j library, but it doesn't work for grapheme clusters like this one: 👩‍👩‍👦‍👦 Calling EmojiUtil.getLength("👩‍👩‍👦‍👦") returns 4 instead of 1 , and similarly calling EmojiUtil.getLength("👻👩‍👩‍👦‍👦") returns 5 instead of 2 . Are there any APIs or methods on String in Java that make it easy to count grapheme clusters? I've been hunting around but understandably the codePoints()

Converting emoji from hex code to unicode

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问题 I want to use emojis in my iOS and Android app. I checked the list of emojis here and it lists out the hex code for the emojis. When I try to use the hex code such as U+1F600 directly, I don't see the emoji within the app. I found one other way of representing emoji which looks like \uD83D\uDE00 . When using this notation, the emoji is seen within the app without any extra code. I think this is a Unicode string for the emoji. I think this is more of a general question that specific to emojis.