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What is the iBeacon Bluetooth Profile

... For an iBeacon with ProximityUUID E2C56DB5-DFFB-48D2-B060-D0F5A71096E0, major 0, minor 0, and calibrated Tx Power of -59 RSSI, the transmitted BLE advertisement packet looks like this: d6 be 89 8e 40 24 05 a2 17 6e 3d 71 02 01 1a 1a ff 4c 00 02 15 e2 c5...
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如何高效学习掌握新技术 - 杂谈 - 清泛网 - 专注C/C++及内核技术

...个大概了解。而且现在网络上相关文章也比较多,通过搜索,也能找到很多相关文章和资料。 明确阶段性目标,选择实践项目 一般一门新技术所涉及面比较广,如果一开始就想全面掌握并不现实,但如果从一个个点去...
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Generate random string/characters in JavaScript

...ters of hex. Option 2 If you have to do this client-side, perhaps try the uuid module - var uuid = require("uuid"); var id = uuid.v4(); // "110ec58a-a0f2-4ac4-8393-c866d813b8d1" Option 3 If you have to do this client-side and you don't have to support old browsers, you can do it without dependen...
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Generating a random & unique 8 character string using MySQL

...ting an 8-character long pseudo-random string in pure (My)SQL: SELECT LEFT(UUID(), 8); You can try the following (pseudo-code): DO SELECT LEFT(UUID(), 8) INTO @plate; INSERT INTO plates (@plate); WHILE there_is_a_unique_constraint_violation -- @plate is your newly assigned plate number S...
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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛,有思想、有深度

...ClearTag(text tag)】:调用 微数据库1.清除标签数据——清除指定标签名下数据记录。   3、获取标签数据【any GetTags()】:调用 微数据库1.获取标签数据——返回该数据存储区内全部标签列表   4、获取数值【any GetValue(text ta...
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内存管理内幕:动态分配选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术

...版本非常类似基本结构,但是它加入了索引,这使得搜索速度更快,并且可以将多个没有被使用块组合为一个大块。它还支持缓存,以便更快地再次使用最近释放内存。 ptmalloc 是 Doug Lea Malloc 一个扩展版本,支持多...
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GetNextDlgTabItem用法详解,回车替代Tab键切换控件焦点 - C/C++ - 清泛网 ...

...法详解,回车替代Tab键切换控件焦点GetNextDlgTabItem函数按指定方向(第二个参数,TRUE往前,默认FALSE往后)检索对话框中有WS_TABSTOP类型第一个控件句柄,即按照对话框...GetNextDlgTabItem 函数按指定方向(第二个参数,TRUE往前...
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CentOS+Nginx+PHP+MySQL详细配置(图解) - PHP - 清泛IT论坛,有思想、有深度

...果是按着上面笔者步骤一步步走下来,安装Nginx时只需指定Nginx安装路径即可 #tar zxvf nginx-0.8.24.tar.gz #cd nginx-0.8.24 #./configure --prefix=/usr/local/nginx     //此处在本环节只需指定一个路径 #make && make install #/u...
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How to suppress GCC warnings from library headers?

...gma GCC diagnostic ignored "-Wunused-but-set-variable" #include <boost/uuid/uuid.hpp> #include <boost/uuid/uuid_generators.hpp> #include <boost/uuid/uuid_io.hpp> #include <boost/lexical_cast.hpp> // turn the warnings back on #pragma GCC diagnostic pop ...
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“21天教你学会C++” - 创意 - 清泛网 - 专注C/C++及内核技术

...,而只需要几天甚至几小时。我在Amazon.com上进行了如下搜索: pubdate: after 1992 and title: days and (title: learn or title: teach yourself) (出版日期:1992年后 and 书名:天 and (书名:学会 or 书名:无师自通)) 我一共得到了248个搜索...