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mqtt协议一般最大支持订阅几个主题？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
... MQTT代理（Broker）的限制（最关键）不同的MQTT代理服务器软件有不同的默认配置和最大限制。EMQX： 这是一个高性能、分布式的开源Broker。其默认配置通常允许单个客户端订阅无限个主题（理论上受限于内存和CPU）。但在生产环...
如何实现循环振动、循环播放音效 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
在计时软件中设置了播放按钮、停止按钮，使用了音效组件调取上传的音效文件，同时使用了音效组件振动，设置了音效振动毫秒数，但是每次计时结束后播放时的音效只是一次性的，请问如何实现在没有点击停止按钮的情况下...
下拉框扩展 - App应用开发 - 清泛IT社区，为创新赋能！
软件自带的下拉框，太简单了，想请问下，有没有相应的扩展，可以方便的修改下拉框的颜色，字体，外形这些？
关于阿里云传输数据问题 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
... anticipation 于 2026-01-04 21:54 编辑
连接阿里云平台时，在软件程序设计中的有关主题发布的消息栏中要直接填写要发送的内容，还是有要阿里云特定的JSON格式？
遇到的问题：平台没反应
求解：
哪里出问题...
What is the Difference Between Mercurial and Git?
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Git is a platform, Mercurial is “just” an application. Git is a versioned filesystem platform that happens to ship with a DVCS app in the box, but as normal for platform apps, it is more complex and has rougher edges than focused ...
Select distinct values from a table field
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By example:
# select distinct code from Platform where id in ( select platform__id from Build where product=p)
pl_ids = Build.objects.values('platform__id').filter(product=p)
platforms = Platform.objects.values_list('code', flat=True).filter(id__in=pl_ids).distinct...
How to print colored text in Python?
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This somewhat depends on what platform you are on. The most common way to do this is by printing ANSI escape sequences. For a simple example, here's some python code from the blender build scripts:
class bcolors:
HEADER = '\033[95m'
OKBLUE = '\03...
Can you build dynamic libraries for iOS and load them at runtime?
....4 on 10.6.4)
1. Open these files in the Property List Editor: /Developer/Platforms/MacOSX.platform/Developer/Library/Xcode/Specifications/MacOSX Product Types.xcspec and /Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Specifications/iPhone Simulator ProductTypes.xcspec
2. Lo...
Kill process by name?
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Assuming you're on a Unix-like platform (so that ps -A exists),
>>> import subprocess, signal
>>> import os
>>> p = subprocess.Popen(['ps', '-A'], stdout=subprocess.PIPE)
>>> out, err = p.communicate()
gives you ps -A...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
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