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通信连接组件 · App Inventor 2 中文网
...像的Base64编码及解码方法，便于图像文件的通信传输。此插件仅提供2个函数，使用非常方便，几乎没有学习成本。
属性
无
事件
无
方法
EncodeImage
DecodeImage
MqttClient 拓展
.aix 拓展及demo程序打包下载：
UrsAI2Paho.zip
MQT...
String concatenation: concat() vs “+” operator
...then throwing it away when you create the final String. In practice memory allocation is surprisingly fast.
Update: As Pawel Adamski notes, performance has changed in more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails bec...
'printf' vs. 'cout' in C++
...letely on operator overloading, so there is no issue with custom formats - all you do is define a subroutine taking std::ostream as the first argument and your type as second. As such, there are no namespace problems - as long you have a class (which isn't limited to one character), you can have wor...
Date vs DateTime
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Unfortunately, not in the .Net BCL. Dates are usually represented as a DateTime object with the time set to midnight.
As you can guess, this means that you have all the attendant timezone issues around it, even though for a Date object you'd want absolutely no timezone han...
Java Desktop application: SWT vs. Swing [closed]
...ava library, no need for
additional native libraries
works the same way on all platforms
Integrated GUI Editor in Netbeans and Eclipse
good online tutorials by Sun/Oracle
Supported by official java extensions (like java OpenGL)
Cons Swing:
Native look and feel may behave
different from the real...
使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...etector.aix 扩展。
请记住，扩展机制仍然不稳定并且正在开发中。 随着系统的发展，你在步骤 (2) 和 (3) 中构建的任何 aia 文件可能需要重新构建。
内容
多点触控演示应用
实现ScaleDetector扩展
App Inventor 没有内置多点触控...
Alarm 闹钟扩展 · App Inventor 2 中文网
...小米设备上请求特殊权限。
工具
对于开发自己的扩展，我收集了一些提示：AI2 FAQ：开发扩展。
原文链接
原版英文文档：Ullis Roboter Seite - AI2 Alarm
您的改进建议 ...
Greenlet Vs. Threads
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Greenlets provide concurrency but not parallelism. Concurrency is when code can run independently of other code. Parallelism is the execution of concurrent code simultaneously. Parallelism is particularly useful when there's a lot of work to be done in userspace, an...
PHP: exceptions vs errors?
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Exceptions are thrown - they are intended to be caught. Errors are generally unrecoverable. Lets say for instance - you have a block of code that will insert a row into a database. It is possible that this call fails (duplicate ID) - you will want to have a "Error" which in this case is an "Exc...
互联网医疗新格局：顶级医生入场 - 资讯 - 清泛网 - 专注C/C++及内核技术
...多的途径。孙宏涛告诉网易科技，“大家医联”计划今后开发的APP，让患者预约医生就像打车一样方便，简而言之就是要做成“滴滴医生”，而其在初期依靠基层医疗机构人工分诊，以后希望借助互联网进行智能分诊。
同样，...