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UrsPahoMqttClient心跳问题解决——Paho底层已自动处理，设好KeepAlive就行...
...ct 时传 keepAliveSeconds=60
2. 监听 Disconnected 事件，断开自动重连
当 UrsPahoMqttClient1.Disconnected
调用 UrsPahoMqttClient1.Connect(...)
3. 如果是 WiFi 热点/4G/企业防火墙环境，NAT 超时可能额外导致掉线，可加个应用层定时器每 30 ...
How to implement a unique index on two columns in rails
...t different syntax for specifying the columns.
– François Beausoleil
Nov 8 '10 at 13:30
14
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Usage of forceLayout(), requestLayout() and invalidate()
...
To better understand answers provided by François BOURLIEUX and Dalvik I suggest you take a look at this awesome view lifecycle diagram by Arpit Mathur:
share
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impro...
重构理论及实践——用工厂模式重构c++后台代码 - C/C++ - 清泛网 - 专注C/C...
重构理论及实践——用工厂模式重构c++后台代码1、背景代码重构和设计模式（其实没什么关联，我硬给拉到了一起），两个似乎都是比较玄的东西。很多时候，抱着gof（写书的四人组）那本经典...
1、背景
代码重构和设计...
Excel: last character/string match in a string
...ted Oct 17 '14 at 7:40
Jean-François Corbett
33.6k2525 gold badges124124 silver badges172172 bronze badges
answered Sep 4 '13 at 15:19
...
GetType() can lie?
... answered May 28 '13 at 9:22
Mårten WikströmMårten Wikström
10k44 gold badges3434 silver badges7676 bronze badges
...
Setting the correct encoding when piping stdout in Python
...at you receive, and encode what you send.
# -*- coding: utf-8 -*-
print u"åäö".encode('utf-8')
Another didactic example is a Python program to convert between ISO-8859-1 and UTF-8, making everything uppercase in between.
import sys
for line in sys.stdin:
# Decode what you receive:
lin...
Mark current Line, and navigate through marked lines
...rks and walk quickly from one to another.
– André Alçada Padez
Apr 19 '12 at 18:17
if you tell me this is impossible...
How to use if - else structure in a batch file?
...%==0 IF %C%==1 (
::copying a directory c from d, /s: boş olanlar hariç, /e:boş olanlar dahil
xcopy "%sourceCopyDirectory%" "%destinationCopyDirectory%" /s/e
)
IF %F%==0 IF %C%==0 (
::moving a directory
xcopy /E "%sourceMoveDirectory%" "%destinationMoveDirectory%"
rd /s /...
RSA 算法是如何诞生的 - 创意 - 清泛网 - 专注C/C++及内核技术
...不算白费，至少指出了 42 条错误的路线。
算法的诞生与命名
1977 年 4 月，Rivest 和其余两人参加了犹太逾越节的 Party，喝了些酒。到家后 Rivest 睡不着，随手翻了翻数学书，随后一个灵感逐渐清晰起来。他大气不敢出一口，冷...