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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...阿里云短信平台接入，短信验证码
【设备信息】 PhoneInfo 拓展：获取手机等设备软硬件、版本等相关信息
【数据库】 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎
【常用工具】 AI2Utils 拓展：一些常用的小功能...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...nning on a NUMA machine. We suggest launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这...
Is .NET/Mono or Java the better choice for cross-platform development? [closed]
How much less libraries are there for Mono than for Java?
15 Answers
15
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创建自定义 TinyWebDB 服务 · App Inventor 2 中文网
...y in a database on the web. Because the data is stored on the web instead of a particular phone, TinyWebDB can be used to facilitate communication between phones and apps (e.g., multi-player games).
By default, the TinyWebDB component stores data on a test service provided by App Inventor, http://t...
micro:bit 微控制器教程 · App Inventor 2 中文网
...左转
右箭头：右转
// 按钮按下时发送指令
when Button_Forward.TouchDown
do
call BluetoothLE1.WriteRXCharacteristic "F\n"
when Button_Backward.TouchDown
do
call BluetoothLE1.WriteRXCharacteristic "B\n"
// 按钮释放时停止
when anyButton.TouchUp
do
call BluetoothL...
Do you (really) write exception safe code? [closed]
...ption handling (EH) seems to be the current standard, and by searching the web, I can not find any novel ideas or methods that try to improve or replace it (well, some variations exist, but nothing novel).
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Tags for Emacs: Relationship between etags, ebrowse, cscope, GNU Global and exuberant ctags
...rough Alex Ott's guide to CEDET and other threads about tags in StackOverflow, but I am still confused about how Emacs interfaces with these different tag systems to facilitate autocompletion, the looking up of definitions, navigation of source code base or the previewing of doc-strings.
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How do I convert NSInteger to NSString datatype?
...u cast them to long, in order to match the current 64-bit architectures' definition:
NSString *inStr = [NSString stringWithFormat: @"%ld", (long)month];
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What part of Hindley-Milner do you not understand?
I swear there used to be a T-shirt for sale featuring the immortal words:
6 Answers
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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...部传感器
Note: This report describes work carried out in Spring 2014 for an Undergraduate Advanced Project in the MIT Department of Electrical Engineering and Computer Science. Funding to support this work was provided by Google ATAP
Introduction
App Inventor is a visual “blocks” based l...