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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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2. 连接管理与重连机制
3. 传感器数据处理
4. 控制指令发布
5. 数据可视化和历史记录
6. 安全连接和身份验证
7. 性能优化和错误处理
8. 高级功能实现
测试和验证
1. 功能测试清单
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Git undo local branch delete
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edited Mar 13 '15 at 8:40
sashoalm
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answ...
How do I get the directory that a program is running from?
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184
Here's code to get the full path to the executing app:
Windows:
int bytes = GetModuleFileName(...
C# vs Java Enum (for those new to C#)
...public static readonly Planet MERCURY = new Planet("Mercury", 3.303e+23, 2.4397e6);
public static readonly Planet VENUS = new Planet("Venus", 4.869e+24, 6.0518e6);
public static readonly Planet EARTH = new Planet("Earth", 5.976e+24, 6.37814e6);
public static readonly Plan...
Base constructor in C# - Which gets called first? [duplicate]
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114
The base constructor will be called first.
try it:
public class MyBase
{
public MyBase()
{...
How to fix Git error: object file is empty?
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24 Answers
24
Active
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Why does sizeof(x++) not increment x?
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542
From the C99 Standard (the emphasis is mine)
6.5.3.4/2
The sizeof operator yields the ...
What are the barriers to understanding pointers and what can be done to overcome them? [closed]
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746
Pointers is a concept that for many can be confusing at first, in particular when it comes to c...
Why does the order of the loops affect performance when iterating over a 2D array?
...rought over to the CPU in little chunks (called 'cache lines'), typically 64 bytes. If you have 4-byte integers, that means you're geting 16 consecutive integers in a neat little bundle. It's actually fairly slow to fetch these chunks of memory; your CPU can do a lot of work in the time it takes for...
Unable to load DLL (Module could not be found HRESULT: 0x8007007E)
I have dll library with unmanaged C++ API code I need to use in my .NET 4.0 application. But every method i try to load my dll i get an error:
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