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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...数据包被转换为以分号分隔的十进制数字字符串，例如“123；33；0；44”。在 AI2 应用程序中，您可以使用 String.Split 获取字节列表。
对于转换，我使用以下算法：
1) 用分号替换所有逗号
2) 用分号拆分字符串
3) 删除前导和尾随...
Difference between sh and bash
...or the Shell Command Language) is a programming language described by the POSIX
standard.
It has many implementations (ksh88, dash, ...). bash can also be
considered an implementation of sh (see below).
Because sh is a specification, not an implementation, /bin/sh is a symlink
(or a hard link) to a...
Just what is Java EE really? [closed]
...nction outside of the application server environment?
Actually they can. Most of the libraries can be directly used standalone (in Java SE) or included in a .war (practically that's nearly always Tomcat). Some parts of Java EE, like JPA, have explicit sections in their respective specifications tha...
What is the difference between “int” and “uint” / “long” and “ulong”?
...unsigned int in your source code you can use the suffix u or U for example 123U.
You should not use uint and ulong in your public interface if you wish to be CLS-Compliant.
Read the documentation for more information:
int
uint
long
ulong
By the way, there is also short and ushort and byte and ...
Difference between class and type
...
123
A class is a type. An interface is a type. A primitive is a type. An array is a type.
There...
Why is GHC so large/big?
...HY2MmxPcEYzYkpweEtDSS1fUlE&hl=en
It looks like the largest directory (123 MB) is the binaries for compiling the compiler itself. The documents weigh in at an astounding 65 MB. Third place is Cabal at 41 MB.
The bin directory is 33 MB, and I think that only a subset of that is what's technica...
How exactly does CMake work?
...ed files do.
CMake introduces a lot of complexity into the build system, most of which only pays off if you use it for building complex software projects.
The good news is that CMake does a good job of keeping a lot of this messiness away from you: Use out-of-source builds and you don't even have ...
Easier way to debug a Windows service
...
123
When I set up a new service project a few weeks ago I found this post. While there are many gr...
Difference between DateTime and Time in Ruby
...DateTime and Time classes in Ruby and what factors would cause me to choose one or the other?
7 Answers
...
What is Cache-Control: private?
...8 GMT
The server receives the request, realizes that the client has the most recent version already. Rather than sending the client 200 OK, followed by the contents of the page, instead it tells you that your cached version is good:
304 Not Modified
Your browser did have to suffer the delay of ...