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大佬们，串口输出的文本字符怎么不能比较，也不能转换数字类型？ - App应用...
大佬们，串口输出的文本字符怎么不能比较，也不能转换数字类型？你好，App Inventor 2 是弱语言类型，文本和数字之间不用刻意去转换，之间赋值就可以了：https://www.fun123.cn/reference/blocks/text.html#text2num
再次经过测试，你上面...
MQTT 之保留消息（Retained Messages） - 创客硬件开发 - 清泛IT社区，为创新赋能！
保留消息定义 如果PUBLISH消息的RETAIN标记位被设置为1，则称该消息为“保留消息”；Broker对保留消息的处理 Broker会存储每个Topic的最后一条保留消息及其Qos，当订阅该Topic的客户端上线后，Broker需要将该消息投递给它。A r...
如何更改启动屏幕 - App应用开发 - 清泛IT社区，为创新赋能！
建立了1个默认的screen1,后来想起要做一个登录屏幕login，但这个新建的login是在screen1后面，如何调换它们的位置，让APP启动时，先从login启动？无法指定启动的屏幕，默认就是特定的Screen1。两种思路：
1、使用“复制屏幕”功能...
Can I mix Swift with C++? Like the Objective-C .mm files
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I wrote a simple Xcode 6 project that show how to mix C++, Objective C and Swift code:
https:/...
C++ Modules - why were they removed from C++0x? Will they be back later on?
...on about his implementation:
http://llvm.org/devmtg/2012-11/Gregor-Modules.pdf?=submit
EDIT 2:
The module support in clang have been documented here:
http://clang.llvm.org/docs/Modules.html
EDIT 3:
Modules are now supported in Microsoft's C++ compiler as well:
http://blogs.msdn.com/b/vcblog/arc...
SQLite UPSERT / UPDATE OR INSERT
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prapinprapin
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Should I be concerned about excess, non-running, Docker containers?
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The containers that are not running are not taking any system resources besides disk space.
I...
iOS / Android cross platform development [closed]
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Kristopher Johnson
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answered May 30 '11 at 1:18
Derek Beatt...
Command line to remove an environment variable from the OS level configuration
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To remove the variable from the current command session without removing it permanently, use th...
How do I do a 'git status' so it doesn't display untracked files without using .gitignore?
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BombeBombe
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