Front-end Common Problem: Android Text Can't Center Vertically

The Problem that Android Text Can't Center Vertically problem Android webview font size less than 12 pixels can not use line height to center vertically ps: At present, this problem exists in applications such as Wechat, but it does not exist in the latest mobile Chrome browser (as of the writing time of this article, the chrome version of Wech ...

Posted by EriRyoutan on Fri, 17 May 2019 00:46:50 -0700

Haproxy Defense DDOS Configuration

Configuring Haproxy to Prevent DDOS Attacks As a load balancer, Happroxy often serves as the front-end of the server, providing service entrance to external users. If security-related issues can be handled at the entrance, it will greatly simplify the design of the back-end. In fact, Haproxy is not only an excellent open source load balancer ( ...

Posted by spoons84 on Fri, 17 May 2019 00:41:04 -0700

Design pattern command pattern (behavioral)

Article directory I. Pattern Definition II. Model roles 3. Model Analysis Typical examples V. Applicable Scenarios I. Pattern Definition Command pattern: encapsulating a request as an object separates the responsibility of issuing a request from the responsibility of executing a request. The two communicate with each oth ...

Posted by jrmckee on Thu, 16 May 2019 16:46:40 -0700

Some Solutions to Codeforces Round #1 (Div. 2)

This game is a good ghost and beast. A question has broken down wa four times. The mentality has exploded directly. I wanted to give up treatment, but I found that BCD is a silly question. A. If at first you don't succeed... (Principle of inclusion and exclusion) Main idea of the title: Some $N individuals took the exam. Among those who pas ...

Posted by emcb_php on Thu, 16 May 2019 10:51:10 -0700

Linux Audio Driver III: Call Flow of pcm Interface

This paper is a learning note based on Linux version number of mini2440 development board linux-2.6.32.2 I. open of pcm equipment According to the article "One of Linux Audio Drivers: Audio Driver Registration Process", pcm device calls the snd_pcm_dev_register function registration. snd_pcm_dev_register err = snd_re ...

Posted by MilesWilson on Thu, 16 May 2019 09:13:40 -0700

Redis Source Learning Brief (7) object Principle and Personal Understanding

Redis Source Learning Brief (7) object Principle and Personal Understanding Object is an encapsulation system in redis.It encapsulates string, list, set, zset and hash as a unified object named robj.This data structure stores data of type, encoding, number of references, data an ...

Posted by djcee on Thu, 16 May 2019 09:00:24 -0700

Multithreaded Three (Thread Synchronization)

As mentioned earlier, in an operating system, a process is the unit of resource allocation and a thread is the unit of dispatch.There can be multiple threads in a process that share the process's resources.Threads are concurrent, that is, when multiple threads in a process complete a task, it is possible to use the same resourc ...

Posted by patrickm on Wed, 15 May 2019 23:03:33 -0700

case when usage of sql

Simple CASE WHEN functions can only deal with some simple business scenarios, while CASE WHEN conditional expressions are written more flexibly. CASE WHEN conditional expression function: Similar to IF ELSE statement in JAVA. Simple CASE WHEN function: CASE SCORE WHEN 'A' THEN 'excellent' ELSE 'Fail,' END CASE SCORE WHEN 'B' THEN 'good' E ...

Posted by stephenk on Wed, 15 May 2019 22:58:17 -0700

HDU6444 Neko's loop

Problem Description Neko has a loop of size n. The loop has a happy value ai on the i−th(0≤i≤n−1) grid. Neko likes to jump on the loop.She can start at anywhere. If she stands at i−th grid, she will get ai happy value, and she can spend one unit energy to go to ((i+k)modn)−th grid. If she has already visited this gri ...

Posted by andrew10181 on Wed, 15 May 2019 22:15:27 -0700

CTF-File Upload

0x00:Secondary Rendering The DDCTF that just ended this morning is really a big brain. In addition to worship a bunch of gangsters, get has a lot of new knowledge: In file upload, most of the questions ask us to upload the picture format, but we will fake some pictures to bypass the validation, some simple front-end validation ...

Posted by powerpants on Wed, 15 May 2019 19:16:04 -0700