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App Inventor 2 扩展资源汇总 - 社区扩展与工具合集 · App Inventor 2 中文网
...。本文汇总常用扩展来源和工具。
已有文档：extensions/index.md 和各扩展单独文档。other/extensions.md 介绍了扩展基础知识。本文是导航汇总。
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Generate random numbers using C++11 random library
... functions and why not to use rand(). In it, he included a slide that basically solves your question. I've copied the code from that slide below.
You can see his full talk here: http://channel9.msdn.com/Events/GoingNative/2013/rand-Considered-Harmful
#include <random>
#include <iostream&g...
Swift - Split string over multiple lines
... some text
over multiple lines
"""
Older versions of Swift don't allow you to have a single literal over multiple lines but you can add literals together over multiple lines:
var text = "This is some text\n"
+ "over multiple lines\n"
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Unittest setUp/tearDown for several tests
...ably going to be to create your own derived TestSuite and override run(). All other calls would be handled by the parent, and run would call your setup and teardown code around a call up to the parent's run method.
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How do I choose a HTTP status code in REST API for “Not Ready Yet, Try Again Later”? [closed]
...agree with this. I have a similar situation (in my case searching from an index which may not yet be populated). Semantically, I think this is correct. However, the RFC for 423 states "This response SHOULD contain an appropriate precondition or postcondition code, such as 'lock-token-submitted' or...
Optimistic vs. Pessimistic locking
...revert all current pending changes which might involve both table rows and index records.
For this reason, pessimistic locking might be ore suitable when conflicts happen frequently, as it reduces the chance of rolling back transactions.
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Changing the resolution of a VNC session in linux [closed]
...t 1600x1200 it doesn't fit on the laptop's screen, and I have to scroll it all the time.
15 Answers
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Find Oracle JDBC driver in Maven repository
...this case is
http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/index.html.
Once you've downloaded the JAR just add it to your computer repository with (note I pulled the groupId, artifactId and version from the POM):
mvn install:install-file -DgroupId=com.oracle -DartifactId=ojdbc14 \
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How to save picture to iPhone photo library?
...ll crash with an error such as the following:
[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1]
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Why does installing Nokogiri on Mac OS fail with libiconv is missing?
I've been trying to install Nokogiri on Mac OS 10.9.3 and whatever I try, the install fails in the end with the following error message:
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