cloudwu

// interface

struct object {
  object * create();
  void release();
  int getState();
};

// implementation

Bill-tran

How To Install OpenSSL 1.1.1 on CentOS 7

This tutorial goes through how to install openssl 1.1.1 on CentOS 7, since the yum repo only installs up to openssl 1.0.

Requirements

Upgrade the system

yum -y update

vietanhdev

#include <chrono>
#include <cmath>
#include <exception>
#include <fstream>
#include <iostream>
#include <limits>
#include <numeric>
#include <opencv2/dnn/dnn.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/imgproc.hpp>

niw

How to extract dylib from shared cache

To understand iOS behaviors, sometimes it’s important to disassemble iOS framework binaries.

Since recent iOS firmware, known as .ipsw file, contains non-encrypted root image, it’s easy to access these binaries. However, each framework binaries, dylib files, are placed in a shared cache file.

Thus, before disassembling it, we need to extract the one from the cache.

tclementdev

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

steven2358

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

fousa

class FairPlayer: AVPlayer {
  
  private let queue = DispatchQueue(label: "com.icapps.fairplay.queue")
 
  func play(asset: AVURLAsset) {
    // Set the resource loader delegate to this class. The `resourceLoader`'s delegate will be 
    // triggered when FairPlay handling is required.
    asset.resourceLoader.setDelegate(self, queue: queue)
    
    // Load the asset in the player.

rueycheng

GNU Make Cheatsheet

Based on https://www.gnu.org/software/make/manual/html_node/Quick-Reference.html

Directives

Directive	Description
define variable define variable = define variable := define variable ::= define variable += define variable ?= endef	Define multi-line variables.
undefine variable	Undefining variables.

rcapraro

This script enables you stop and start Symantec Endpoint Protection on OS X

Installation

sudo curl https://gist.githubusercontent.com/rcapraro/a9ebd4db4d1bfe45b02f89aabd6595a3/raw/sep -o /usr/local/bin/sep
sudo chmod 755 /usr/local/bin/sep
sudo chown root:staff /usr/local/bin/sep

anhphamt

If you do not install pip, you can try this link: http://sharadchhetri.com/2014/05/30/install-pip-centos-rhel-ubuntu-debian/

1. install: easy_install supervisor
2. configure:
3. mkdir -p /etc/supervisord/conf.d