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物联网入门 · App Inventor 2 中文网
...数据
新建过程 updateDataLabel，将 LabelData.文本 设置为：
Reading: X [Accel_X] Y [Accel_Y] Z [Accel_Z]
9. 接收数据事件
加入 当 Arduino101Accelerometer1.AccelerometerDataReceived，把三个参数分别存入全局变量，然后调用 updateDataLabel。
10. 测试加...
/etc/apt/sources.list" E212: Can't open file for writing
... of how to save those changes:
One time Setup demo to create a root owned read only file for a lower user:
sudo touch temp.txt
sudo chown root:root temp.txt
sudo chmod 775 temp.txt
whoami
el
First open the file as normal user:
vi temp.txt
Then make some changes to the file, it warns you its r...
How to choose between Hudson and Jenkins? [closed]
...f the core developers, the community, and (so far) much more actual work.
Read that post I linked up top, then read the rest of these in chronological order. For balance you can read the Hudson/Oracle take on it. It's pretty clear to me who is playing defensive and who has real intentions for the ...
Play audio with Python
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Reading this made me so emotional. My eyes literally teared up with happiness. Did not expect that kind of reaction from myself. (They linked to a module I made.)
– ArtOfWarfare
Jan 24 '...
How do I programmatically get the GUID of an application in .net2.0
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You should be able to read the Guid attribute of the assembly via reflection. This will get the GUID for the current assembly
Assembly asm = Assembly.GetExecutingAssembly();
var attribs = (asm.GetCustomAttributes(typeof(GuidAttri...
Make a UIButton programmatically in Swift
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Inversely, anyone reading this may also want to know that if your button action references a function that takes no parameter, the colon is not needed and may even cause an error if not removed.
– Dave G
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How do I look inside a Python object?
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First, read the source.
Second, use the dir() function.
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What is the 'new' keyword in JavaScript?
... to Function.prototype, numbers to Number.prototype, etc.). It can only be read with Object.getPrototypeOf(someObject). There is no other way to set or read this value.
Functions, in addition to the hidden [[prototype]] property, also have a property called prototype, and it is this that you can ac...
How do emulators work and how are they written? [closed]
...art at the IP (instruction pointer -- also called PC, program counter) and read the instruction from memory. Your code parses this instruction and uses this information to alter processor state as specified by your processor. The core problem with interpretation is that it's very slow; each time y...
SHA1 vs md5 vs SHA256: which to use for a PHP login?
...in, and I'm trying to decide whether to use SHA1 or Md5, or SHA256 which I read about in another stackoverflow article. Are any of them more secure than others? For SHA1/256, do I still use a salt?
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