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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...id}/{attribute}/{action}
示例：
home/thermostat/livingroom/temperature/set
office/light/meeting_room/brightness/get
factory/sensor/machine_001/status/online
通配符使用规则：
// 单级通配符匹配
call UrsPahoMqttClient1.Subscribe "home/+/temperature" // 匹配 home/livingroom/tempe...
Creating Unicode character from its number
I want to display a Unicode character in Java. If I do this, it works just fine:
13 Answers
...
Asynchronous shell exec in PHP
...but doesn't care at all about the output. The shell script makes a number of SOAP calls and is slow to complete, so I don't want to slow down the PHP request while it waits for a reply. In fact, the PHP request should be able to exit without terminating the shell process.
...
Use of .apply() with 'new' operator. Is this possible?
... f();
The anything parameter doesn't matter much, since the new keyword resets f's context. However, it is required for syntactical reasons. Now, for the bind call: We need to pass a variable number of arguments, so this does the trick:
var f = Cls.bind.apply(Cls, [anything, arg1, arg2, ...]);
resu...
How to get all of the immediate subdirectories in Python
...vel subdirectories then break out of the os.walk iteration after the first set of return values.
– yoyo
Nov 27 '15 at 3:54
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Can you call Directory.GetFiles() with multiple filters?
...omehow skipped over that github link. Maybe i should adapt my screen color settings :)
– BatteryBackupUnit
Jul 23 '14 at 18:46
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NPM - How to fix “No readme data”
...
Just set as private ;)
{
"name": "camapaign",
"version": "0.0.1",
"private": true,
"scripts": {
"start": "node app.js"
},
"engines": {
"node": "0.10.15",
"npm": "1.3.5"
},
"repository": {
"type": ...
How to change the background color of a UIButton while it's highlighted?
...
You can override UIButton's setHighlighted method.
Objective-C
- (void)setHighlighted:(BOOL)highlighted {
[super setHighlighted:highlighted];
if (highlighted) {
self.backgroundColor = UIColorFromRGB(0x387038);
} else {
se...
How do you specify a byte literal in Java?
...what's stopping you from simply declaring it ahead of time?
byte b = 0; //Set to desired value.
f(b);
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C++ SpinLock 自旋锁的代码实现（全网最简略的方式） - C/C++ - 清泛网 - ...
...C_FLAG_INIT) {}
virtual ~SpinLock() {}
void lock() { while(f_.test_and_set(memory_order_acquire)); }
void unlock() { f_.clear(memory_order_release); }
};
2、有退避策略的自旋锁，尝试一定次数(65535)失败后让出线程调度权：
class SpinLockWithYield {
atomic_flag ...