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ble 蓝牙透传代码怎么写？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...用我们这个模块这个地址可以吗？
上图中是控制服务id：SERVICEF000_UUUID = UUID.fromString("0000f000-0000-1000-8000-00805f9b34fb");以及2个控制端口的特征id。
可以做到透传，不过要换透传 id，这个 id 是 io 控制口
晚一些我给你一...
How does zip(*[iter(s)]*n) work in Python?
...e each element is x. *arg unpacks a sequence into arguments for a function call. Therefore you're passing the same iterator 3 times to zip(), and it pulls an item from the iterator each time.
x = iter([1,2,3,4,5,6,7,8,9])
print zip(x, x, x)
...
How to use concerns in Rails 4
...owerful concept. It has to do with code reuse as in the example below. Basically, the idea is to extract common and / or context specific chunks of code in order to clean up the models and avoid them getting too fat and messy.
As an example, I'll put one well known pattern, the taggable pattern:
#...
Using “label for” on radio buttons
...lmost got it. It should be this:
<input type="radio" name="group1" id="r1" value="1" />
<label for="r1"> button one</label>
The value in for should be the id of the element you are labeling.
sh...
How to create a zip archive with PowerShell?
..., "$aDirectory", "-r";
& $pathToZipExe $arguments;
}
You can the call it like this:
create-7zip "c:\temp\myFolder" "c:\temp\myFolder.zip"
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Populate data table from data reader
...
Please check the below code. Automatically it will convert as DataTable
private void ConvertDataReaderToTableManually()
{
SqlConnection conn = null;
try
{
string connString = ConfigurationManager.ConnectionStrings["Northw...
How to expire session due to inactivity in Django?
... just have to make some urls and views to return relevant data to the ajax calls regarding the session expiry.
when the user opts to "renew" the session, so to speak, all you have to do is set requeset.session['last_activity'] to the current time again
Obviously this code is only a start... but it...
SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
...
update q
set q.QuestionID = a.QuestionID
from QuestionTrackings q
inner join QuestionAnswers a
on q.AnswerID = a.AnswerID
where q.QuestionID is null -- and other conditions you might want
I recommend to check what the result set to update is befo...
What's the difference between identifying and non-identifying relationships?
...
An identifying relationship is when the existence of a row in a child table depends on a row in a parent table. This may be confusing because it's common practice these days to create a pseudokey for a child table, but not make...
How can I view an old version of a file with Git?
...
You can also specify a commit hash (often also called commit ID) with the git show command.
In a nutshell
git show <commitHash>:/path/to/file
Step by step
Show the log of all the changes for a given file with git log /path/to/file
In the list of changes shown, it...