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Get nth character of a string in Swift programming language
... ways to access the character
data stored inside strings.
String.utf8 is a collection of UTF-8 code units in the
string. Use this API when converting the string to UTF-8.
Most POSIX APIs process strings in terms of UTF-8 code units.
String.utf16 is a collection of UTF-16 code units i...
CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...以大部分网页对象（Web page object），如html, htm, php等页面文件，gif,tif, png, bmp等图片文件，以及其他格式的文件，在有效期（TTL）内，对于重复的访问，不必从原始网站重新传送文件实体，只需通过简单的认证（Freshness Validation）...
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/...
...我们还可以更进一步，直接把密码等敏感信息保存到配置文件中，最容易想到的配置文件是「~/.my.cnf」，此外，还有几个更官方的配置文件可供选择，我们可以在源代码里看到它们的踪影：
default_files => [
"/etc/percona-toolkit/p...
how to get the cookies from a php curl into a variable
...mple of how to use it:
<?php
header("content-type: text/plain;charset=utf8");
$ch=curl_init();
$headers=array();
$cookies=array();
$debuginfo="";
$body="";
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
$body=hhb_curl_exec2($ch,'https://www.youtube....
Node.js: how to consume SOAP XML web service
...le created
const xml = require('fs').readFileSync('./bmicalculator.wsdl', 'utf8');
//create an express server and pass it to a soap server
const server = app.listen(3030, function() {
const host = '127.0.0.1';
const port = server.address().port;
});
soap.listen(server, '/bmicalculator', service,...
top命令使用详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...该命令的很多特性都可以通过交互式命令或者在个人定制文件中进行设定.
top [-] [d delay] [p pid] [q] [c] [C] [S] [s] [i] [n iter] [b]
p 仅监视进程给定的进程ID
d 指定每两次屏幕信息刷新之间的时间间隔。当然用户可以使用s交互命令来...
How do different retention policies affect my annotations?
...tion.CLASS annotated class gets a RuntimeInvisible class attribute:
#14 = Utf8 LRetentionClass;
[...]
RuntimeInvisibleAnnotations:
0: #14()
while Retention.RUNTIME annotation gets a RuntimeVisible class attribute:
#14 = Utf8 LRetentionRuntime;
[...]
RuntimeVisibleAn...
how to set desired language in git-gui?
...
For Linux you can use from a terminal:
LC_ALL=en_US.utf8 git gui
to start your git-gui for example temporary in english from your current terminal. This solution will affect only your current instance of git-gui and nothing else. Credit goes to Junio C Hamano
Update for use...
What is the _snowman param in Ruby on Rails 3 forms for?
...
Snowman has since been replaced by a hidden input named utf8 with value set to "&#x2713". I use a form_tag for my language switcher and started to get lots of exceptions because one crawler appears to have problems with this value and incorrectly concatenates the utf8 paramete...
LoadRunner中参数化技术详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
8
DataFile/Table
可以在属性设置中编辑文件，添加内容，也可以从数据库中提取数据。
9
UseDefinedFunction
从dll的简单函数中获取信息替代参数
【注意】对于参数类型为File/Table的...