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select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...面三篇总结写的很清楚，并用服务器回射echo程序进行了测试。连接如下所示：
select：http://www.cnblogs.com/Anker/archive/2013/08/14/3258674.html
poll：http://www.cnblogs.com/Anker/archive/2013/08/15/3261006.html
epoll：http://www.cnblogs.com/Anker/archive/2013/08/...
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...QX 是如何支持单集群亿级 MQTT 并发连接的？点击查看详细测试过程 →协议支持Mosiquitto 作为 MQTT Broker 提供了完整的 MQTT 3.1/3.1.1/5.0 协议支持，支持协议规范中的遗嘱消息、保留消息、共享订阅等能力，同时也支持 MQTT over WebSocket...
怎么往SetTimer的回调函数传递参数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...形参的交集，这个交集就是我们可以自定义的参数，经过测试，发现wParam其实就是SetTimer返回的id，也就是 TimerProc的形参idEvent，于是例子如下：
VOID CALLBACK TimerFunc(HWND hwnd,UINT uMsg,UINT_PTR idEvent,DWORD dwTime)
{
char * buf = (char*)idEv...
How do I create a nice-looking DMG for Mac OS X using command-line tools?
...ep '^/dev/' | sed 1q | awk '{print $1}')
Store the background picture (in PNG format) in a folder called ".background" in the DMG, and store its name in the "backgroundPictureName" variable.
Use AppleScript to set the visual styles (name of .app must be in bash variable "applicationName", use vari...
BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...数设置成一样。
之所以要这么设计，是为了防止在批量测试或者使用设备时，由于多个设备的同时广播，而形成数据风暴，防止设备之间的干扰。
扫描
扫描类别
主动扫描：设备主动扫描来获取更多对端设备的信息上报Hos...
CSS filter: make color image with transparency white
I have a colored png image with transparency. I would like to use css filter to make the whole image white but leave the transparency as it is.
Is that possible in CSS?
...
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...v2.LINE_AA)
## Ok, you can see the result as tag(6)
cv2.imwrite("detected.png", canvas)
Related answers:
How to detect colored patches in an image using OpenCV?
Edge detection on colored background using OpenCV
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
How to use `cv2.fi...
“To Do” list before publishing Android app to market [closed]
...omatically deleted at compile time.
Optimize your images (using Paint.NET, PNGCrush or OptiPNG).
Optimize your layouts for most of screen sizes. You can do this by simply changing the screen size while editing a layout in AndroidStudio or Eclipse.
Try/catch all exceptions on the UI and display a sim...
What is the difference between a string and a byte string?
..., WAV, etc.
If you want to store a picture, you must first encode it using PNG, JPEG, etc.
If you want to store text, you must first encode it using ASCII, UTF-8, etc.
MP3, WAV, PNG, JPEG, ASCII and UTF-8 are examples of encodings. An encoding is a format to represent audio, images, text, etc in ...
BLE（四）嗅探工具 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...侦听工具0x21 Frontline BPA® 600Frontline Test Equipment——“前线测试设备”（简称“前线”，Frontline），主要是针对各种各样的协议所做的一个“协议分析器”。“前线”系统的销售策略是“卖硬件，送软件”，而软件自然是和硬件相...