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怎么在订阅发布主体内以16位数据发送 modbus 报文 - App Inventor 2 拓展 -...
怎么在MQTT 中 在订阅中发送16位数据参考代码如下：
App Inventor 2 发表于 2024-07-12 18:22
参考代码如下：
你好，按照你给的例子，修改了以后点击发送出现错误，请给解答一下
15898807301 发表于 2024-07-13 18:13
你好，按照...
When is CRC more appropriate to use than MD5/SHA1?
When is it appropriate to use CRC for error detection versus more modern hashing functions such as MD5 or SHA1? Is the former easier to implement on embedded hardware?
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How is a CRC32 checksum calculated?
Maybe I'm just not seeing it, but CRC32 seems either needlessly complicated, or insufficiently explained anywhere I could find on the web.
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Compile time string hashing
...
This is a little bit late, but I succeeded in implementing a compile-time CRC32 function with the use of constexpr. The problem with it is that at the time of writing, it only works with GCC and not MSVC nor Intel compiler.
Here is the code snippet:
// CRC32 Table (zlib polynomial)
static constex...
Fastest hash for non-cryptographic uses?
...
CRC32 is pretty fast and there's a function for it: http://www.php.net/manual/en/function.crc32.php
But you should be aware that CRC32 will have more collisions than MD5 or even SHA-1 hashes, simply because of the reduced le...
MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
...EXT NULL, upper_boundary TEXT NULL, this_crc CHAR(40) NOT NULL, this_cnt INT NOT NULL, master_crc CHAR(40) NULL, master_cnt INT NULL, ts TIMESTAMP NOT NULL DEFAULT CURRENT_TIMES...
App Inventor 2 CRC16 拓展 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
参考：https://community.appinventor.mit.edu/t/can-someone-help-me-reproduce-this-code-using-the-blocks/60372/15CRC16 算法有多种，本扩展以 ASCII 格式接收数据并以 CRC16/CCITT-FALSE 格式给出结果。在线计算CRC网站：https://crccalc.com/
MySQL主从服务器数据一致性的核对与修复 - 数据库(内核) - 清泛网 - 专注C/...
...FROM percona.checksums
WHERE (
master_cnt <> this_cnt
OR master_crc <> this_crc
OR ISNULL(master_crc) <> ISNULL(this_crc))
GROUP BY db, tbl;
BTW：多数情况下，只要比较「master_crc <> this_crc」就可以了。
MySQL主从服务器数据一致性的修复
通过在主...
Hash function that produces short hashes?
...ut 10-characters is pretty small for the result set. Way back, people used CRC-32, which produces a 33-bit hash (basically 4 characters plus one bit). There is also CRC-64 which produces a 65-bit hash. MD5, which produces a 128-bit hash (16 bytes/characters) is considered broken for cryptographic pu...
How big can a user agent string get?
...erformed quickly at 2.3 seconds with no collisions. Interestingly I tried crc32 and crc32b and they also performed at 2.3 seconds with no collisions. But, because md5 has more combinations than crc32 and crc32b, md5 would likely have fewer possible collisions. Anyway, md5 is my choice and I expect...