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What are the differences between type() and isinstance()?
...summarize the contents of other (already good!) answers, isinstance caters for inheritance (an instance of a derived class is an instance of a base class, too), while checking for equality of type does not (it demands identity of types and rejects instances of subtypes, AKA subclasses).
Normally, i...
Automatically start a Windows Service on install
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In your Installer class, add a handler for the AfterInstall event. You can then call the ServiceController in the event handler to start the service.
using System.ServiceProcess;
public ServiceInstaller()
{
//... Installer code here
this.AfterInstall += n...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
文章源自：https://www.gandalf.site/2018/11/ble_23.html
参考低功耗蓝牙（BLE）安全初探
0x1 信道BLE的物理通道即“频道，分别是‘f=2402+k*2 MHz, k=0, … ,39’，带宽为2MHz”的40个RF Channel。
其中，有3个信道是advertising channel（广播通道）...
How would you implement an LRU cache in Java?
Please don't say EHCache or OSCache, etc. Assume for purposes of this question that I want to implement my own using just the SDK (learning by doing). Given that the cache will be used in a multithreaded environment, which datastructures would you use? I've already implemented one using LinkedHashM...
How to get started on TDD with Ruby on Rails? [closed]
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TDD is all about writing tests first. This basically forces you to write your own client before you write your application code. The cycle is generally write a test for an API that doesn't exist, run the test expecting it to fail, go write your API code, run your test again and...
What is the difference between String and string in C#?
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string is an alias in C# for System.String.
So technically, there is no difference. It's like int vs. System.Int32.
As far as guidelines, it's generally recommended to use string any time you're referring to an object.
e.g.
string place = "world...
String slugification in Python
...ce, it's just one file). The project is still active (got updated 2 days before I originally answered, over seven years later (last checked 2020-06-30), it still gets updated).
careful: There is a second package around, named slugify. If you have both of them, you might get a problem, as they have t...
What is “callback hell” and how and why does RX solve it?
...ion together with a simple example that explains what is a "callback hell" for someone who does not know JavaScript and node.js ?
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How to uninstall a Windows Service when there is no executable for it left on the system?
How do I uninstall a Windows Service when there is no executable for it left on the system? I can not run installutil -u since there is not executable left on the system. I can still see an entry for the service in the Services console.
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Converting pixels to dp
I have created my application with the height and width given in pixels for a Pantech device whose resolution is 480x800 .
...