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mqtt 接收的信息为json格式 怎么将json 信息解析出来显示在指定的文本上 ...
...收的信息，通过JSON解析后 把WD 的参数24 解读出来 显示到文本上
代码如下：
注意：此代码块是右键导出的png，具有还原代码块的功能，无需手动一个个处理。
具体还原方法请参考：https://www.fun123.cn/reference/other/dow...
怎么串口读取的文本数据，不能转成数字类型呢？ - App应用开发 - 清泛IT社...
怎么串口读取的文本数据，不能转成数字类型呢？file:///E:/Users/QHW/Desktop/63e61567c7b4ea71b198d7eb1d6af9c.png
UTF-8: General? Bin? Unicode?
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In general, utf8_general_ci is faster than utf8_unicode_ci, but less correct.
Here is the difference:
For any Unicode character set, operations performed using the _general_ci collation are faster than those for the _unicode_ci coll...
How to change the CHARACTER SET (and COLLATION) throughout a database?
...n in a table (Mysql). He set it up with Latin collation, when it should be UTF8, and now I have issues. Every record with Chinese and Japan character turn to ??? character.
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What are the differences between utf8_general_ci and utf8_unicode_ci? [duplicate]
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utf8_general_ci is a very simple — and on Unicode, very broken — collation, one that gives incorrect results on general Unicode text. What it does is:
converts to Unicode normalization form D for canonical decompositio...
How to make MySQL handle UTF-8 properly
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Update:
Short answer - You should almost always be using the utf8mb4 charset and utf8mb4_unicode_ci collation.
To alter database:
ALTER DATABASE dbname CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
See:
Aaron's comment on this answer How to make MySQL handle UTF-8 properly
W...
How can I transform string to UTF-8 in C#?
...:
byte[] bytes = Encoding.Default.GetBytes(myString);
myString = Encoding.UTF8.GetString(bytes);
Another thing you may have to remember: If you are using Console.WriteLine to output some strings, then you should also write Console.OutputEncoding = System.Text.Encoding.UTF8;!!! Or all utf8 strings...
How to change collation of database, table, column?
The database is latin1_general_ci now and I want to change collation to utf8mb4_general_ci .
19 Answers
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Why would json_encode return an empty string
...ns probably a faulty response, some strings were probably not UTF-8
using utf8_encode() on those string solved my problem, but see note below
Here is a recursive function that can force convert to UTF-8 all the strings contained in an array:
function utf8ize($d) {
if (is_array($d)) {
...
java.sql.SQLException: Incorrect string value: '\xF0\x9F\x91\xBD\xF0\x9F…'
...ne will see squares if you are not using fonts that support them.
MySQL's utf8 only supports basic multilingual plane, and you need to use utf8mb4 instead:
For a supplementary character, utf8 cannot store the character at all,
while utf8mb4 requires four bytes to store it. Since utf8 cannot s...