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社交应用组件 · App Inventor 2 中文网
...，并允许用户选择一个App来共享内容，例如邮件App、社交网络App、短信App等。
文件路径可以来自其他组件，例如照相机 或 图像选择框，但也可以指定直接从存储中读取。
请注意：不同的设备处理的存储路径可能不同，例如...
Database design for audit logging
...would house the primary key you'd reference for your foreign key relationships. The Opportunities_Content table would hold all the fields your users can change and for which you'd like to keep an audit trail. Each record in the Content table would include its own PK and the modified-by and modifie...
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
...
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]
...
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...