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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...用send_LL(0x53,2402M)（注：2402M为信道频率）。这里还有一个问题，设备B怎么知道这个数据包是发给自己的还是其他人的，为此BLE引入access address概念，用来指明接收者身份，其中，0x8E89BED6这个access address比较特殊，它表示要发给周...
创业公司倒闭大潮 教你正确烧钱速度？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...：月净现金消耗量只有10万，却希望融600-800万。我第一个问题就会问：
“老兄，请问如果你每月只烧10万，到底为什么你要融这么多钱？”
不管他们背地里在想什么，我最后听到的答案通常是：因为我办得到。
但“我办得到...
One-liner to recursively list directories in Ruby?
...
In PHP or other languages to get the content of a directory and all its subdirectories, you have to write some lines of code, but in Ruby it takes 2 lines:
require 'find'
Find.find('./') do |f| p f end
this will print the con...
What text editor is available in Heroku bash shell? [closed]
...ate heroku-vim so you'll need to do it yourself. In my example I'm running php:
~ $ cat Procfile
web: vendor/bin/heroku-php-apache2
You can start this command yourself!
~ $ vendor/bin/heroku-php-apache2 2>/dev/null &
[2] 845
It's now running in the background!
curl your website
Dynos ...
difference between variables inside and outside of __init__()
...s if you don't create them in __init__().
– too much php
Oct 8 '09 at 11:43
3
@too much php: All ...
Composer: how can I install another dependency without updating old ones?
...sues with Laravel and mcrypt: check that it's properly enabled in your CLI php.ini. If php -m doesn't list mcrypt then it's missing.
Important: Don't forget to specify new/package when using composer update! Omitting that argument will cause all dependencies, as well as composer.lock, to be updated...
How to “log in” to a website using Python's Requests module?
...name and password, so we go to the login page say http://example.com/login.php now and view it's source code and search for the action URL it will be in form tag something like
<form name="loginform" method="post" action="userinfo.php">
now take userinfo.php to make absolute URL which wil...
How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
...njoy it!!!
Just because I have had problems with my hosting provider
<?php /*
Author: Luis Siquot
Purpose: Check ajax performance and errors
License: GPL
site5: Please don't drop json requests (nor delay)!!!!
*/
$r = (int)$_GET['r'];
$w = (int)$_GET['w'];
if($r) {
sleep($w);
ech...
Deadly CORS when http://localhost is the origin
....
The following code works for me with POST to LocalHost with Chrome
<?php
if (isset($_SERVER['HTTP_ORIGIN'])) {
//header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
header("Access-Control-Allow-Origin: *");
header('Access-Control-Allow-Credentials: true');
hea...
How do I properly escape quotes inside HTML attributes?
...
If you are using PHP, try calling htmlentities or htmlspecialchars function.
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