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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...条消息就发送上千条采集的数据，或者比较大的设备阴影文件。技术挑战TCP需要解决的问题是在IP包传输过程中，处理异构网络环境下的网络拥塞、丢包、乱序、重复包等多种问题。MQTT解决的问题是，在低带宽高延迟不可靠的网...
How to securely save username/password (local)?
...rotect():
// Data to protect. Convert a string to a byte[] using Encoding.UTF8.GetBytes().
byte[] plaintext;
// Generate additional entropy (will be used as the Initialization vector)
byte[] entropy = new byte[20];
using(RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
{
rng.Get...
理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...给系统用，不致于让系统立刻崩溃。如果检查相关的日志文件（/var/log/messages）就会看到下面类似的 Out of memory: Kill process 信息：
...
Out of memory: Kill process 9682 (mysqld) score 9 or sacrifice child
Killed process 9682, UID 27, (mysqld) total-vm:47...
What column type/length should I use for storing a Bcrypt hashed password in a Database?
...(“Sorry, this password is already in use”) at all. I'd recommend using UTF8 everywhere. In that case there will be no problems, will there?
– Neonit
Jan 17 '18 at 9:44
2
...
Natural Sort Order in C#
...xP1sxKl8xKsKt" +
"bjEyKsKtbjEzKsSwKg==";
string[] fileNames = Encoding.UTF8.GetString(Convert.FromBase64String(encodedFileNames))
.Replace("*", ".txt?").Split(new[] { "?" }, StringSplitOptions.RemoveEmptyEntries)
.Select(n => expand(n)).ToArray();
...
30条爆笑的程序员梗 PHP是最好的语言 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...憋屈的事情就是：你辛辛苦苦熬夜写了一个风格优雅的源文件，被一个代码风格极差的同事改了且没署名，以至于别人都以为是你写的。
24.应聘
程序员应聘必备词汇：了解=听过名字;熟悉=知道是啥;熟练=用过;精通=做过东西。
...
Get Character value from KeyCode in JavaScript… then trim
...he character A has a charcode of 41 (according to, for example, http://www.utf8-chartable.de/). However, those are hex values, converting to decimal gives us a charcode of 65 for "A" and 97 for "a".[1] This is consistent with what we get from String.fromCharCode for these values.
My own requireme...
mfc里面的140种颜色宏 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ine CLR_BLACK RGB( 0, 0, 0) // 纯黑
完整.h文件下载：ColorDef.zip
mfc 颜色宏
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...使用空格，分号，逗号之类分隔符也可以，在innodb_config.c文件的源代码中能查到如下关于分隔符的定义，文档里并没有涵盖这些信息：
static const char* sep = " ;,|\n";
最后使用Memcached协议来访问一下，这里我们换个花样，执行一...
How to create a MySQL hierarchical recursive query
...`root`@`localhost` FUNCTION `get_lineage`(the_id INT) RETURNS text CHARSET utf8
READS SQL DATA
BEGIN
DECLARE v_rec INT DEFAULT 0;
DECLARE done INT DEFAULT FALSE;
DECLARE v_res text DEFAULT '';
DECLARE v_papa int;
DECLARE v_papa_papa int DEFAULT -1;
DECLARE csr CURSOR FOR
select _id,pa...