Qt Write Custom Control 56-Wave Curve

1. Preface Wave curve control, in fact, is a core of the previous water wave progress bar control. In fact, it uses sinusoidal curve to generate corresponding coordinates for drawing, and extracts this function independently, in order to study various sinusoidal cosine and other expansion effects in m ...

Posted on Fri, 20 Sep 2019 19:21:33 -0700 by Crysma

Qt Writing Custom Control 55-Mobile Address Book

I. Preface In the previous several articles, the difficulty coefficient of the control is nearly 0, and there is even a suspicion of the number of controls. This time, we must have a strong control. The difficulty coefficient of this control ranks the top five among all the controls, and the amount of code is not small. The header files are 550 ...

Posted on Fri, 20 Sep 2019 08:02:14 -0700 by robert_gsfame

Accessing Kubernetes CRD with client-go package

Accessing Kubernetes CRD with client-go packageThe Kubernetes API server can be easily extended by customizing resource definitions. However, accessing these resources with the client-go library is a bit cumbersome, and there is no complete official documentation. For example, the Kube builder operator-framework can easily help us create and im ...

Posted on Thu, 19 Sep 2019 05:23:45 -0700 by igoy

[Linux] Chapter 8 - Multithreading

Chapter 8 Multithreading Thread concept _Multiprocess task processing is the simultaneous processing of tasks through multiple processes. Multiple PCBs have multiple virtual address spaces and execute different codes separately, which are not related to each other. Multithreading, on the other hand, ...

Posted on Thu, 19 Sep 2019 03:16:11 -0700 by compguru910

Quickly learn how to write CMakeLists.txt files

    This paper summarizes the writing method of CMakeLists.txt file on linux platform. First General Module   1.1 cmake version requirements cmake_minimum_required( VERSION 2.8 ) # Project file name loop_closure, optional project( loop_closure ) 1.2 Compilation mode IF(NOT CMAKE_BUILD_T ...

Posted on Thu, 19 Sep 2019 00:24:33 -0700 by killerofet

Kubernetes1.15.2 Cluster Deployment and Deployment of Metrics Server Plug-ins

Environmental information: operating system host name IP Address CentOS 7.6 k8s-master 192.168.31.61 CentOS 7.6 k8s-node1 192.168.31.62 CentOS 7.6 k8s-node2 192.168.31.63 1. Installation requirements Before you begin, deploying the Kubernetes cluster machine requires the following conditions: Operating System CentOS7.x-86_x64 Hard ...

Posted on Wed, 18 Sep 2019 17:15:04 -0700 by Vizionz

Web Clustering Using Haproxy

1. Overview of casesHaproxy is a popular cluster scheduling tool at present. There are many scheduling tools of the same kind, such as LVS and Nginx.Compared with LVS, LVS has the best performance but is relatively complex to build; Nginx's upstream module supports clustering, but it does not have a strong cluster node health check function an ...

Posted on Wed, 18 Sep 2019 13:10:54 -0700 by piet

Linux Text Processing Commands for Programming Tips

Qualified programmers are good at using tools. The so-called gentleman is not different, but good at faking things. Reasonable use of Linux command line tools can improve our work efficiency. This article briefly introduces three scenarios that can use Linux text processing commands to broaden your thinking. Hope that after reading this article ...

Posted on Wed, 18 Sep 2019 08:14:08 -0700 by PugJr

Talk about memory in Java

JVM memory First, put a JVM memory partition map, which can be divided into heap and non-heap (rough partition, based on java8) Then the maximum physical memory occupied by a Java process is: Max Memory = eden + survivor + old + String Constant Pool + Code cache + compressed class space + Metaspace + Thread stack(*thread num) + Direct + Mapped ...

Posted on Tue, 17 Sep 2019 03:58:18 -0700 by leetee

httpclient multithreaded crawler instance

In the process of researching security testing recently, I stumbled upon a loophole in a certain station, which did not need to be checked when accessing resources. The original limit on the number of times users accessed resources every day was gone. I want to use crawler to crawl more data, but the amount of data is too large, so I want to us ...

Posted on Tue, 17 Sep 2019 00:53:14 -0700 by miro_igov