erebe

A Journey into Haskell and Open Source

I want to write something to celebrate the latest and I hope the last release of wstunnel, a TCP/UDP tunneling websocket tool, and share with you at the same time my story with Haskell and OpenSource projects.

A venture into Haskell

This open source project is not my only one, but is found to my hearth because it brought me joy, despair, proud, shame and further reach that I wasn't even expecting at first. If you have not noticed, the program is written in Haskell. I started learning it, well 8 years ago now..., when I was studying abroad in South Korea. At the time I was struggling with the feeling that I was not enough, I already knew C++ and Java, but was feeling like stagnating while there was so much more that I wasn't knowing. I wanted to be more and thus I needed to dedicate myself to learn more in order to be better. This fear of stagnation is still present in me even today, and if you are working as a programmer, I t

matthewjberger

Installing OpenCV on Windows

First open a powershell terminal install the scoop package manager:

iex (new-object net.webclient).downloadstring('https://get.scoop.sh')

Note: if you get an error you might need to change the execution policy (i.e. enable Powershell) with:

gryzzly

/**
 * Get bounding box from set of coordinates [lat,lng] and distance in (deg) adopted to JS
 * 
 * @param {number} distance - distance (deg) from the point represented by centerPoint
 * @param {array} centerPoint - two-dimensional array containing center coords [latitude, longitude]
 * @description
 *   Computes the bounding coordinates of all points on the surface of a sphere
 *   that has a great circle distance to the point represented by the centerPoint
 *   argument that is less or equal to the distance argument.
 *   Technique from: Jan Matuschek <http://JanMatuschek.de/LatitudeLongitudeBoundingCoordinates>

luismoramedina

		String cer = "/home/luis/Downloads/APImIntranet.cer";
		FileInputStream fileInputStream = new FileInputStream(cer);

		CertificateFactory cf = CertificateFactory.getInstance("X.509");
		X509Certificate cert = (X509Certificate)cf.generateCertificate(fileInputStream);
		PublicKey publicKey = cert.getPublicKey();
		byte[] encoded = publicKey.getEncoded();
		byte[] b64key = Base64.getEncoder().encode(encoded);
		System.out.println("b64key = " + new String(b64key));

erdem

[
    {
        "timezones": [
            "America/Aruba"
        ], 
        "latlng": [
            12.5, 
            -69.96666666
        ], 
        "name": "Aruba", 

diorahman

So I need to load the X509 key generated from ssh-keygen.

e.g.

$ ssh-keygen -t rsa -b 1024 -C "bla@bla.com"

PUBLIC

lanceliao

#!/usr/bin/env python  
#coding=utf-8
#  
# Generate a list of dnsmasq rules with ipset for gfwlist
#  
# Copyright (C) 2014 http://www.shuyz.com   
# Ref https://code.google.com/p/autoproxy-gfwlist/wiki/Rules    
 
import urllib2 
import re

sandyxu

常用的几个 Ruby 版本管理工具有：rvm，rbenv，ry，rbfu。rvm 应该是最早出现、使用最多的，因为过于强大以至于违背了某个 Linux 软件开发原则，所以出现了很多轻便的替代者，其中来自 37signals 的 rbenv 就很受欢迎。ry 和 rbfu 看上去更轻便，不过使用不广泛。之前使用过rvm, 这次尝试下rbenv。

我的环境是 Ubuntu14.04

1. 安装 rbenv

rbenv的源代码托管在github，在终端中，从 github 上将 rbenv 源码 clone 到本地，然后设置 $PATH。

git clone git://github.com/sstephenson/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc

kofemann

public interface GuavaCacheMXBean {

    public long getRequestCount();

    public long getHitCount();

    public double getHitRate();

    public long getMissCount();

ellios

public class DBCPDemo {

    public static void main(String[] args) throws SQLException {
        System.out.println("Setting up data source.");
        DataSource dataSource = setupDataSource();
        System.out.println("Done.");

        //
        // Now, we can use JDBC DataSource as we normally would.
        //