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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 Invent...
...- 特性UUID，通俗来讲它是硬件中某一功能的唯一身份ID
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：00000000-0000-1000-8000-0...
How to create PDF files in Python [closed]
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I suggest pyPdf. It works really nice. I also wrote a blog post some while ago, you can find it here.
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How do I get the logfile from an Android device?
...e following:
connect the device to the pc.
Check that I already setup my os for that particular device.
Open a terminal
Run adb shell logcat > log.txt
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How can I create a directly-executable cross-platform GUI app using Python?
...gram that will convert your python scripts into standalone executables.
Cross-platform GUI libraries with Python bindings (Windows, Linux, Mac)
Of course, there are many, but the most popular that I've seen in wild are:
Tkinter - based on Tk GUI toolkit (de-facto standard GUI library for python...
Should you commit .gitignore into the Git repos?
...mally yes, .gitignore is useful for everyone who wants to work with the repository. On occasion you'll want to ignore more private things (maybe you often create LOG or something. In those cases you probably don't want to force that on anyone else.
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What's so wrong about using GC.Collect()?
...one of these things that respectable programmers wouldn't ever use, even those who don't even know what it is for.
20 Answe...
Increasing the maximum number of TCP/IP connections in Linux
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The ephermal port range defines the maximum number of outbound sockets a host can create from a particular I.P. address. The fin_timeout defines the minimum time these sockets will stay in TIME_WAIT state (unusable after being used once).
Usual system defaults are:
net.ipv4.ip_local_port_range = ...
Bash: infinite sleep (infinite blocking)
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BSD (or at least OS X) doesn't understand sleep infinity either, though it was a cool thing to learn about for Linux. However, while true; do sleep 86400; done ought to be an adequate substitute.
– Ivan X
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how to prevent “directory already exists error” in a makefile when using mkdir
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"Generally, stick to the widely-supported (usually posix-specified) options and features of these programs. For example, don't use ‘mkdir -p’, convenient as it may be, because a few systems don't support it at all and with others, it is not safe for parallel execution. " ...
How do I concatenate multiple C++ strings on one line?
...stringstream ss;
ss << "Hello, world, " << myInt << niceToSeeYouString;
std::string s = ss.str();
Take a look at this Guru Of The Week article from Herb Sutter: The String Formatters of Manor Farm
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