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BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...较高的情况下），也可以在广播和扫描的基础上进行连接后点对点通信。广播访问地址广播包：广播包Access Address 固定为0x8E89BED6，广播包只能在广播信道（channel）上传输，即只能在37/38/39信道上传输（注：从蓝牙5.0开始广播包...
Why use AJAX when WebSockets is available?
...s provided a 624% increase in the number of requests per second my application could process.
7 Answers
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Is embedding background image data into CSS as Base64 good or bad practice?
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It's not a good idea when you want your images and style information to be cached separately. Also if you encode a large image or a significant number of images in to your css file it will take the browser longer to download the file leaving your site without any of the style information ...
C# using streams
Streams are kind of mysterious to me. I don't know when to use which stream and how to use them. Can someone explain to me how streams are used?
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Why aren't variables declared in “try” in scope in “catch” or “finally”?
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Two things:
Generally, Java has just 2 levels of scope: global and function. But, try/catch is an exception (no pun intended). When an exception is thrown and the exception object gets a variable assigned to it, that object variable is only available within the "catch" section and is destroyed ...
What is the easiest way to parse an INI file in Java?
I am writing a drop-in replacement for a legacy application in Java. One of the requirements is that the ini files that the older application used have to be read as-is into the new Java Application. The format of this ini files is the common windows style, with header sections and key=value pairs...
How to Configure SSL for Amazon S3 bucket
...azon S3 bucket for uploading and downloading of data using my .NET application. Now my question is: I want to access my S3 bucket using SSL. Is it possible to implement SSL for an Amazon s3 bucket?
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Add text to Existing PDF using Python
... know this is an older post, but I spent a long time trying to find a solution. I came across a decent one using only ReportLab and PyPDF so I thought I'd share:
read your PDF using PdfFileReader(), we'll call this input
create a new pdf containing your text to add using ReportLab, save this as a...
Responsive font size in CSS
I've created a site using the Zurb Foundation 3 grid. Each page has a large h1 :
30 Answers
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How to detect when cancel is clicked on file input?
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While not a direct solution, and also bad in that it only (as far as I've tested) works with onfocus (requiring a pretty limiting event blocking) you can achieve it with the following:
document.body.onfocus = function(){ /*rock it*/ }
What's nice...