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BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...广播方式的报文有4种，分别为可连接的非定向广播（ADV_IND）、可连接的定向广播（ADV_DIRECT_IND）、可扫描非定向广播（ADV_SCAN_IND）、不可连接的非定向广播（ADV_NONCONN_IND）
4种广播的使用场景各不相同
可连接的非定向广播（A...
How to check whether a file or directory exists?
...s
func exists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil { return true, nil }
if os.IsNotExist(err) { return false, nil }
return false, err
}
Edited to add error handling.
share
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Use ASP.NET MVC validation with jquery ajax?
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Using the jQuery.validate library should be pretty simple to set up.
Specify the following settings in your Web.config file:
<appSettings>
<add key="ClientValidationEnabled" value="true"/>
<add key="UnobtrusiveJavaScriptEnabled" value="true"/>
</appSettings>
Wh...
Find nearest value in numpy array
... the future. Use 'series.values.argmin' to get the position of the minimum now. Using idxmin instead of argmin works for me with the solution above. (v3.6.4)
– jorijnsmit
May 15 '18 at 6:36
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What are the GCC default include directories?
When I compile a very simple source file with gcc I don't have to specify the path to standard include files such as stdio or stdlib.
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How do I send a cross-domain POST request via JavaScript?
... this was last edited 4 years ago - will this work on mobile browsers now?
– frankpinto
Sep 7 '17 at 17:19
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show 8 more comments
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Shall we always use [unowned self] inside closure in Swift
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No, there are definitely times where you would not want to use [unowned self]. Sometimes you want the closure to capture self in order to make sure that it is still around by the time the closure is called.
Example: Making an asynchronous network request
If you are making an asynchronous...
Back to previous page with header( “Location: ” ); in PHP
...edirection problems. Anyway, I agree that using the referer is not the way if you need 100% safety
– Pekka
Mar 12 '12 at 10:23
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How do I bind a WPF DataGrid to a variable number of columns?
My WPF application generates sets of data which may have a different number of columns each time. Included in the output is a description of each column that will be used to apply formatting. A simplified version of the output might be something like:
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Return JSON response from Flask view
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As of Flask 1.1.0, you can now directly return a python dict, and it will be automatically jsonify'd by Flask.
– Adrien Ball
Apr 14 at 14:48
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