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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
来源：http://www.zsqz.com/chuangke/10r.htm
【学习目标】
1.掌握App Inventor中对调用手机计步器、位置传感器等硬件传感器的应用；
2.了解数据持久化，掌握数据存储等功能的实现；
3.通过编程实践，感受和体验利用手机...
What is the good python3 equivalent for auto tuple unpacking in lambda?
...
According to http://www.python.org/dev/peps/pep-3113/ tuple unpacking are gone, and 2to3 will translate them like so:
As tuple parameters are used by lambdas because of the single
expression limitation, they must also be supported. This is...
What's the difference between encoding and charset?
...n addition to the other answers I think this article is a good read
http://www.joelonsoftware.com/articles/Unicode.html
The article is titled "The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)" written by Joel Spolsky. The ...
How to flip background image using CSS?
...
According to w3schools:
http://www.w3schools.com/cssref/css3_pr_transform.asp
The transform property is supported in Internet Explorer 10, Firefox, and Opera.
Internet Explorer 9 supports an alternative, the -ms-transform property (2D transforms only...
embedding image in html email
...s to:
If you don't have a base64-data string, create one easily at:
http://www.motobit.com/util/base64-decoder-encoder.asp from a image file.
Email source code looks something like this, but i really cant tell you what that boundary thing is for:
To: email@email.de
Subject: ...
Content-Type: mu...
scp or sftp copy multiple files with single command
...r.txt \
your_username@remote2.edu:/some/remote/directory/
Source: http://www.hypexr.org/linux_scp_help.php
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Sign APK without putting keystore info in build.gradle
...links:
http://blog.macromates.com/2006/keychain-access-from-shell/
http://www.thoughtworks.com/es/insights/blog/signing-open-source-android-apps-without-disclosing-passwords
Since you are using Mac OSX, you can use the Keychain Access to store your passwords.
Then in your gradle scripts:
/* Ge...
Which annotation should I use: @IdClass or @EmbeddedId
...ry key class to be used must all be annotated with @Id.
Reference: http://www.apress.com/us/book/9781430228509
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Safely override C++ virtual functions
...thing) const = 0 {
// boring default code
}
};
I thought I read on www.parashift.com that you can actually implement an abstract method. Which makes sense to me personally, the only thing it does is force subclasses to implement it, no one said anything about it not being allowed to have an ...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...现步骤可能跟文章所讨论的并不一致。原文译自：http://www.codeproject.com/Articles/175482/Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler
引言
开始文章之前，先声明几件重要事情。本文不是一篇介绍如何在x86架构上详...