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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...要具有一些 App Inventor 经验，但不需要了解 Java 或 Android 软件开发工具包 (SDK) 库。
本文的其余部分组织如下。第二部分介绍了背景和相关工作。第三部分说明了两个组件的设计和实现细节。第四部分描述了我们使用这两个组件...
Structure padding and packing
...
That's exactly why, if you look at IP, UDP, and TCP header layouts, you'd see that all integer fields are aligned.
– Nikolai Fetissov
May 24 '14 at 15:09
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Representational state transfer (REST) and Simple Object Access Protocol (SOAP)
...ocol (SOAP):
SOAP builds an XML protocol on top of HTTP or sometimes TCP/IP.
SOAP describes functions, and types of data.
SOAP is a successor of XML-RPC and is very similar, but describes a standard way to communicate.
Several programming languages have native support for SOAP, you typically feed ...
Difference between __str__ and __repr__?
...nambiguous — notice that str(3)==str("3"). Likewise, if you implement an IP abstraction, having the str of it look like 192.168.1.1 is just fine. When implementing a date/time abstraction, the str can be "2010/4/12 15:35:22", etc. The goal is to represent it in a way that a user, not a programmer,...
What is the difference between a URI, a URL and a URN?
...does weird stuff like checking equality of URLs by resolving host names to IP addresses (which seems at odds with RFC 3986 sec 6 in the first place, and breaks w virtual hosts). I think this just means the Java Standard Library has some inconsistent class behavior.
– Andrew Jan...
In Functional Programming, what is a functor?
.... Looking around on the web has provided either excessively technical descriptions (see the Wikipedia article ) or incredibly vague descriptions (see the section on Functors at this ocaml-tutorial website ).
...
What are the disadvantages of using persistent connection in PDO
... other PHP database interface that does persistent connections: if your script terminates unexpectedly in the middle of database operations, the next request that gets the left over connection will pick up where the dead script left off. The connection is held open at the process manager level (Apa...
Set up DNS based URL forwarding in Amazon Route53 [closed]
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Open the settings for "Edit Redirection Rules".
Paste the following XML snippet in it's entirety.
<RoutingRules>
<RoutingRule>
<Redirect>
<Protocol>https</Protocol>
<HostName>myaccount.signin.aws.amazon.com</HostName>
<ReplaceKey...
Alternative to google finance api [closed]
... csv...can you grab data as JSON instead?
– bouncingHippo
Nov 19 '12 at 16:39
3
Worth noting that...
How do BitTorrent magnet links work?
... maps torrents (identified by infohashes) to lists of peers (identified by IP address and ports) who are participating in a swarm for that torrent (uploading/downloading data or metadata).
The first time a client joins the DHT network it generates a random 160-bit ID from the same space as infohash...