用Erlang编码表情符号 [英] Encoding emoji in Erlang

问题描述

假设我有一个二进制

Message = <<"string containing emoji">>.

如何正确地以Unicode编码？我尝试这样做：

How do I properly encode it in Unicode? I tried doing:

Encoded = <<Message/utf16>>.

编译文件时收到此警告：

I get this warning when compiling the file:

警告：二进制构建将失败，并带有'badarg'异常
（utf8 / utf16 / utf32段中的无效Unicode代码点）

Warning: binary construction will fail with a 'badarg' exception (invalid Unicode code point in a utf8/utf16/utf32 segment)

我也尝试了/ utf8。同样的警告。

I tried this with /utf8 as well. Same warning.

推荐答案

假设您开始使用的二进制文件是根据UTF-8编码的，则需要将其编码为小尾数UTF-16，这应该可以工作：

Assuming that the binary you start with is encoded according to UTF-8, and you need to encode it as little-endian UTF-16, this should work:

unicode:characters_to_binary(<<"string containing emoji">>, utf8, {utf16, little})

请参见 Unicode模块的文档以获取更多信息。

See the documentation for the Unicode module for more information.

<<消息/ utf16>> 失败的原因是 utf8 ，位语法中的utf16 和 utf32 说明符编码单个代码点，而不是整个字符串。因此，要对字符 U + 1F64C 进行编码，可以使用：

The reason why <<Message/utf16>> fails is that the utf8, utf16 and utf32 specifiers in bit syntax encode a single codepoint, not an entire string. So to encode the character U+1F64C, you could use:

2> <<16#1f64c/utf8>>.
<<240,159,153,140>>
3> <<16#1f64c/utf16>>.
<<"\330=\336L">>
4> <<16#1f64c/utf32>>.
<<0,1,246,76>>

这篇关于用Erlang编码表情符号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！