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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
...硬件提供的文档或厂商提供的java源码，一般会有提供。
一个硬件UUID示例如下：
UUID分为标准UUID和厂商自定义UUID
标准UUID：由SIG发布，采用UUID基数 + 16位UUID的形式，如心率服务的UUID是0x180D，使用的UUID基数是：00000000-0000-10...
How is mime type of an uploaded file determined by browser?
...st to catch types that we can
// deduce but that we also want to allow the OS to override.
The hard-coded lists come a bit earlier in the file: https://cs.chromium.org/chromium/src/net/base/mime_util.cc?l=170 (kPrimaryMappings and kSecondaryMappings).
An example: when uploading a CSV file from a Wi...
How do I rename all files to lowercase?
... user2066039: This must must be a recent thing on the Mac, because most answers older than a year don't account for it. I accomplished the task by using an intermediate extension like 'jpg1'. So, JPG -> jpg1 -> jpg. Hope that helps.
– Joyce
Nov 1 '...
Is optimisation level -O3 dangerous in g++?
I have heard from various sources (though mostly from a colleague of mine), that compiling with an optimisation level of -O3 in g++ is somehow 'dangerous', and should be avoided in general unless proven to be necessary.
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What is the Haskell response to Node.js?
...lack of a thread abstraction to be a disadvantage. I'd disagree with his position, particularly in the context of Haskell: I think the abstractions that threads provide are essential for making server code easier to get right, and more robust. In particular:
using one thread per connection lets ...
How to close Android application?
I want to close my application, so that it no longer runs in the background.
22 Answers
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How in node to split string by newline ('\n')?
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MacOSX don't use single \r anymore, that was only for old Macs. I think they have the same \n as other unixes.
– jcubic
Dec 10 '17 at 9:10
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How to select a CRAN mirror in R
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You should either get a window with a list of repositories or a text menu with some options. But if that is not appearing, you can always specify the mirror from where to download the packages yourself by using repos parameter. By doing that, R will not ask you anymore abou...
process.env.NODE_ENV is undefined
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To set an environment variable in Windows:
SET NODE_ENV=development
on OS X or Linux:
export NODE_ENV=development
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What are carriage return, linefeed, and form feed?
...eed means to advance downward to the next line; however, it has been repurposed and renamed. Used as "newline", it terminates lines (commonly confused with separating lines). This is commonly escaped as \n, abbreviated LF or NL, and has ASCII value 10 or 0x0A. CRLF (but not CRNL) is used for the p...