大约有 9,000 项符合查询结果（耗时：0.0196秒） [XML]
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...滤、转换、存储与处理，以加速应用集成和业务创新。可操作性与可观测性Mosquitto 提供了基本的日志和调试功能，用于监控代理状态和故障排除。然而，它缺乏先进的管理和监控功能，使用户难以从其运行状态获得更多洞察进...
std::string to float or double
...to convert a string to a double.
You can do it with the stringstream or boost::lexical_cast but those come with a performance penalty.
Ahaha you have a Qt project ...
QString winOpacity("0.6");
double temp = winOpacity.toDouble();
Extra note:
If the input data is a const char*, QByteArray::to...
onSaveInstanceState () and onRestoreInstanceState ()
...
Usually you restore your state in onCreate(). It is possible to restore it in onRestoreInstanceState() as well, but not very common. (onRestoreInstanceState() is called after onStart(), whereas onCreate() is called before onStart().
Use the put methods to store values in onSav...
Go install fails with error: no install location for directory xxx outside GOPATH
... @RobertReiz while I share your frustration, I should point out that most other languages do in fact use these, but maybe they're not as visible. For example, Python (a language famous for its simplicity) has PYTHONHOME instead of GOROOT and PYTHONPATH instead of GOPATH. Even (GC)C has LIBRARY_...
Android代码优化小技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...一个StringBuffer，请修改你的实现方式，避免直接进行连接操作，应该采用创建一个临时对象来做这个操作。
当从输入的数据集中抽取出Strings的时候，尝试返回原数据的substring对象，而不是创建一个重复的对象。
一个稍微激进...
Printing 1 to 1000 without loop or conditionals
...
Compile time recursion! :P
#include <iostream>
template<int N>
struct NumberGeneration{
static void out(std::ostream& os)
{
NumberGeneration<N-1>::out(os);
os << N << std::endl;
}
};
template<>
struct NumberGener...
What is that “total” in the very first line after ls -l? [closed]
... is freely modifiable with the
--block-size=<int> flag on ls, the POSIXLY_CORRECT=1 GNU
environment variable (to get 512-byte units), or the -k flag to force
1kB units.
physical_block_size is the OS dependent value of an internal block interface, which may or may not be connected to t...
对外网用户的squid代理+认证 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...========================
一、一级代理服务器的架设
说明：
操作系统：
FreeBSD6.2Release
代理软件：
Squid2.6STABLE16
外网卡：em0 -> 218.90.159.xxx （默认网关为上一级ISP提供）
内网卡：em1 -> 192.168.21.254
1、FreeBSD的安装及优化
（1）最小...
Match two strings in one line with grep
...nswered Dec 20 '10 at 6:16
dheerosaurdheerosaur
11.6k66 gold badges2727 silver badges3030 bronze badges
...
What does the NS prefix mean?
...don't mind if the accepted answer changes to one of the others (if that's possible - never checked that).
– Olaf Kock
Aug 8 '12 at 20:21
2
...