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二进制数据专题：蓝牙、Socket、WebSocket、MQTT 收发字节 · App Inventor 2 中文网
...多不是发一句文本，而是发一串字节：
「帧头 A5、命令 01、两个字节的温度、一个字节的校验」。这类格式叫二进制协议。
App Inventor 里处理二进制只需要记住一件事：字节列表就是由 0~255 的数字组成的普通列表。
下面这些组...
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
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edited Dec 21 '16 at 0:33
answered Mar 13 '12 at 19:48
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Definition of a Balanced Tree
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edited Feb 5 '13 at 16:50
answered Feb 5 '13 at 16:30
com...
How to get an enum which is created in attrs.xml in code
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There does not seem to be an automated way to get a Java enum from an attribute enum - in Java ...
How do I get time of a Python program's execution?
...s that your program takes at least a tenth of second to run.
Prints:
--- 0.764891862869 seconds ---
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How to initialise memory with new operator in C++?
...ay of type int with the new operator, how can I initialise them all to 0 without looping through them all myself? Should I just use memset ? Is there a “C++” way to do it?
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How do I pass command-line arguments to a WinForms application?
... two different WinForms applications, AppA & AppB. Both are running .NET 2.0.
6 Answers
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Set cURL to use local virtual hosts
...icitly for this: --resolve
Instead of curl -H 'Host: yada.com' http://127.0.0.1/something
use curl --resolve 'yada.com:80:127.0.0.1' http://yada.com/something
What's the difference, you ask?
Among others, this works with HTTPS. Assuming your local server has a certificate for yada.com, the firs...
Why do people say there is modulo bias when using a random number generator?
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10 Answers
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How to append rows to an R data frame
...sive insight than system.time:
library(microbenchmark)
microbenchmark(f1(1000), f3(1000), f4(1000), times = 5)
# Unit: milliseconds
# expr min lq median uq max neval
# f1(1000) 1024.539618 1029.693877 1045.972666 1055.25931 1112.769176 5
# f3(1000) ...