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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
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App Inventor 2 拓展参考文档
本文档描...
【持续更新】App Inventor 2 中文拓展一览 - App Inventor 2 中文网 - 清泛...
...项目文件中提取.aix拓展包
中文网拓展
【剪贴板】 Clipboard 拓展：实现剪贴板的复制粘贴功能
【短信平台接入】 AliSms 拓展：阿里云短信平台接入，短信验证码
【设备信息】 PhoneInfo 拓展：获取手机等设备软硬件、版本等...
Are HTTPS URLs encrypted?
...story or not. You can make a URL unguessable by including a longish random string in it, but if it's a public URL then the attacker can tell that it has been visited, and if it has a short secret in it, then an attacker could brute-force that at reasonable speed.
– Steve Jessop...
Best way to store date/time in mongodb
I've seen using strings, integer timestamps and mongo datetime objects.
2 Answers
2
...
How do I find out which computer is the domain controller in Windows programmatically?
...PrincipalContext context = new PrincipalContext(ContextType.Domain))
{
string controller = context.ConnectedServer;
Console.WriteLine( "Domain Controller:" + controller );
}
This will list all the users in the current domain:
using (PrincipalContext context = new PrincipalContext(Context...
Linux下安装项目管理工具Redmine - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...My account里可以修改成其它语言。
启动WEB服务
# ruby script/server webrick -e production
或# ruby /usr/local/redmine/script/server webrick -e production
停止web服务方法：在当前启动窗口按ctrl+C
访问http://ip:3000/
初始用户名/密码：admin/admin
这...
What's the difference between ASCII and Unicode?
...t their language (to support "é", in French, for example). Just using one extra bit doubled the size of the original ASCII table to map up to 256 characters (2^8 = 256 characters). And not 2^7 as before (128).
10000010 -> é (e with acute accent - 130)
10100000 -> á (a with acute accent - 16...
Why does Git treat this text file as a binary file?
...ut need of a null (00h) byte for anything other than the nul char (the 'C' string terminator). Thus Git's text definition is that the content (well the first 1k bytes) should not have a null byte when utf-8 encoded. Try stackoverflow.com/questions/2241348/… for a fun read. My original comment ref...
Concatenate multiple result rows of one column into one, group by another column [duplicate]
...
Simpler with the aggregate function string_agg() (Postgres 9.0 or later):
SELECT movie, string_agg(actor, ', ') AS actor_list
FROM tbl
GROUP BY 1;
The 1 in GROUP BY 1 is a positional reference and a shortcut for GROUP BY movie in this case.
string_agg() ...
Use '=' or LIKE to compare strings in SQL?
...he (almost religious) discussion, if you should use LIKE or '=' to compare strings in SQL statements.
9 Answers
...