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C# 通过代码安装、卸载、启动、停止服务 - .NET(C#) - 清泛IT论坛，有思想、有深度
#region Windows服务控制区
#region 安装服务
private void InstallService(string filepath, string serviceName)
{
try
&nb...
Sort a Map by values
... any more (stackoverflow.com/questions/109383/…). Also, why was there a cast to Double? Shouldn't it just be return ((Comparable)base.get(a).compareTo(((Comparable)base.get(b)))?
– Stephen
Aug 11 '10 at 21:50
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How do I catch a numpy warning like it's an exception (not just for testing)?
...catch_warnings() placement depending on how big of an umbrella you want to cast with catching errors this way.
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Structure padding and packing
... know mostly used in transmitting(i.e networking) a data, when you need to cast a byte array to a struct, and be sure that an array fit to a struct fields. If the spark can not do that, how those working at all?!
– Hi-Angel
May 24 '14 at 9:19
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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
文章源自：http://doc.iotxx.com/index.php?title=BLE技术揭秘
BLE技术揭秘
BLE是低功耗蓝牙的英文缩写（Bluetooth Low Energy），是蓝牙4.0版本起开始支持的新的、低功耗版本的蓝牙技术规范。蓝牙技术联盟（Bluetooth SIG）在2010年发布了跨...
Difference between std::system_clock and std::steady_clock?
...eryPerformanceCounter(&counter);
return time_point(duration(static_cast<rep>((double)counter.QuadPart / frequency.QuadPart *
period::den / period::num)));
}
private:
static bool is_inited; ...
Weak and strong property setter attributes in Objective-C
...s the parent so neither is ever released).
The 'toll free bridging' part (casting from NS to CF) is a little tricky. You still have to manually manage CFRelease() and CFRetain() for CF objects. When you convert them back to NS objects you have to tell the compiler about the retain count so it kno...
Creating an index on a table variable
...lly works:
declare @cmd varchar(500)='CREATE NONCLUSTERED INDEX [ix_temp'+cast(newid() as varchar(40))+'] ON #temp (NonUniqueIndexNeeded);';
exec (@cmd);
This insures the name is always unique even between simultaneous executions of the same procedure.
...
Is unsigned integer subtraction defined behavior?
...ake sure that the result is signed, then stored it into signed variable or cast it to signed. When you want to get the difference between numbers and make sure that the modular arithmetic will not be applied, then you should consider using abs() function defined in stdlib.h:
int c = five - seven; ...
Does const mean thread-safe in C++11?
...thread-safe since no writes are possible (and if you are considering const_cast-ing something originally declared const then you get undefined-behavior and that's it).
So what does it mean then?
Let's assume --for the sake of argument-- that multiplication operations are extremely costly and we be...