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How to Query an NTP Server using C#?
...ntry(ntpServer).AddressList;
//The UDP port number assigned to NTP is 123
var ipEndPoint = new IPEndPoint(addresses[0], 123);
//NTP uses UDP
using(var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
socket.Connect(ipEndPoint);
...
上线当天App就崩了，才发问题是手机网络超时没处理——用App Inventor 2的W...
... 参考文档：App Inventor 2 Web客户端完整文档 → https://www.fun123.cn/reference/components/connectivity.html
JSON解析案例：JSON转字典教程 → https://www.fun123.cn/reference/blocks/dictionaries.html
文件上传方案：App Inventor 2 文件上传到服务器全方案...
A semantics for Bash scripts?
...ion.
$ foo() { echo $x; }
$ bar() { local x; echo $x; }
$ foo
$ bar
$ x=123
$ foo
123
$ bar
$ …
Environment and process "scope"
Subshells inherit the variables of their parent shells, but other kinds of processes don't inherit unexported names.
$ x=123
$ ( echo $x )
123
$ bash -c 'echo $x'...
How to set an environment variable only for the duration of the script?
On Linux (Ubuntu 11.04) in bash, is it possible to temporarily set an environment variable that will only be different from the normal variable for the duration of the script? For example, in a shell script, making an app that saves to HOME portable by temporarily setting HOME to a folder in the pre...
Why does PHP consider 0 to be equal to a string?
...alse.
But what if I do need to compare numbers as strings with numbers?
"123" === 123
evaluates false because the left and right term are of different type.
What is actually needed is a weak comparison without the pitfalls of PHP type juggling.
The solution is to explicit promote the terms to ...
array_push() with key value pair
...
Warning: $a['123'] = 456; - string '123' is converted to integer key 123.
– bancer
Jul 2 at 12:58
1
...
Check whether variable is number or string in JavaScript
...constructors, you can use typeof:.
typeof "Hello World"; // string
typeof 123; // number
If you're creating numbers and strings via a constructor, such as var foo = new String("foo"), you should keep in mind that typeof may return object for foo.
Perhaps a more foolproof method of che...
jQuery document.createElement equivalent?
...lease notice that a is a jQuery object while b is a html element:
a.html('123')
// [<div>123</div>]
b.html('123')
// TypeError: Object [object HTMLDivElement] has no method 'html'
$(b).html('123')
// [<div>123</div>]
...
How can I remove all text after a character in bash?
...
@kp123: It's the first example in my answer. The second time I show it (where "tomorrow" is removed), it's almost exactly the situation you're asking about.
– Paused until further notice.
A...
Where to store global constants in an iOS application?
...
You could also do a
#define kBaseURL @"http://192.168.0.123/"
in a "constants" header file, say constants.h. Then do
#include "constants.h"
at the top of every file where you need this constant.
This way, you can switch between servers depending on compiler flags, as in:
#i...