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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
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蓝牙App开发示例
demo参考界面如下：
扫描蓝牙设备，代码如下：
扫描完成后，设备列表展示到“列表显示框”组件中：
点击列表中的目标设备（一般硬件文档会有说明，名称会有特别的标识），连接蓝牙设备的代码如...
How to delete duplicate lines in a file without sorting it in Unix?
Is there a way to delete duplicate lines in a file in Unix?
9 Answers
9
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Sorting multiple keys with Unix sort
I have potentially large files that need to be sorted by 1-n keys. Some of these keys might be numeric and some of them might not be. This is a fixed-width columnar file so there are no delimiters.
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App Inventor 2 LLMAI2Ext 自研拓展：接入DeepSeek、Kimi、通义千问...等国...
...了APIKey，因此不直接提供aia源码，这里以Kimi为例，附上代码块：
开始对话：
切换输出模式（默认流式输出，可切换非流式一把输出内容）：
流式输出响应事件，每输出一部分内容都会回调一次，追加展示；最后一次回调...
Select unique or distinct values from a list in UNIX shell script
I have a ksh script that returns a long list of values, newline separated, and I want to see only the unique/distinct values. It is possible to do this?
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How can I convert a DateTime to the number of seconds since 1970?
I'm trying to convert a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001.
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What characters are forbidden in Windows and Linux directory names?
...e question, first.
The forbidden printable ASCII characters are:
Linux/Unix:
/ (forward slash)
Windows:
< (less than)
> (greater than)
: (colon - sometimes works, but is actually NTFS Alternate Data Streams)
" (double quote)
/ (forward slash)
\ (backslash)
| (vertical bar or pipe)
? (qu...
Your build failed due to an error in the AAPT stage, not because of an...
...多次。示例：许多屏幕，但只有两三个屏幕可以用更好的代码来完美；许多标签或文本框，而单个 ListView 会更好。项目文件有某种形式的损坏项目文件名包含不受支持的字符构建过程被防病毒应用程序中断（可能导致文件损坏...
Mozilla PDF.js：PDF在线预览 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，PDF.js果然也不例外。从github上面我们可以下载PDF.js项目源代码，examples里有几个demo示例，helloworld运行就报错，此处省略研究过程1W字，大家只用看结论就可以了：IE9报错就升级的IE10，我也是试出来的，这个时候还不知道原因...
Boost程序库完全开发指南——深入C++“准”标准库高清PDF版 - 文档下载 - ...
...常常自嘲为斯德哥尔摩综合症患者，用 Python 写着懒散的代码时，会怀念以前编写 C++ 代码的那种被虐感。但当真正要写一些 C++ 代码的时候，又会怀念 Python 带给我的自在，这也许就是所谓的由奢入俭难了。幸好有 Boost，有时候...