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Recently, I spent several days implementing a web music player. Just for fun. With the player, I can listen to songs that are stored in my home computer. While at work, I just need to start a remote service at my house and then open the browser and input the...
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Recently, I found an excellent jQuery plugin jquery.qrcode.js, which is written by Jerome Etienne. In this article, I would like to share how to use the QR code plugin to implement a free online app with Google App Engine. You can try my demo http://dynamsoft-test.appspot.com/. How to Implement QR Code...
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In this tutorial, I would like to show how to configure and install nginx on Mac OS X. My Mac system is Mavericks 10.9.2. Prerequisites You have to install Xcode command line tools. Install Nginx Download the latest stable version – nginx 1.4.7. Unzip the downloaded package by the command...
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In my daily life, I enjoy taking photos with my smartphone and uploading them to various websites. So I started thinking, “Is it possible to implement these functions in a web browser?” Fortunately, the new HTML5 SDK is capable of uploading local images or captured images to web servers. Everything...
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In HTML5, there is a new tag <canvas>, which is used to draw graphics via JavaScript. In this tutorial, I would like to share how to draw images on canvas, and how to save the canvas data to local disk by clicking button. Ads Powered by Dynamsoft Draw Images on...
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In this article, I will share the basic concept of Libwebsockets, as well as how to write a simple program with the APIs. What is Libwebsockets Libwebsockets is a lightweight pure C library; built to use minimal CPU and memory resources as well as providing fast throughput in both directions....
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In this tutorial, let’s continue to learn how to use OpenSSL to sign a certificate. Steps of Signing Certificate with OpenSSL We can use the command line to quickly generate ca certificate. openssl genrsa -out cakey.pem 2048 openssl req -new -days 365 -x509 -key cakey.pem -out cacert.pem -nodes -subj /C=CA/ST=BC/L=Vancouver/O=Dynamsoft/OU=Dynamsoft/CN=Dynamsoft/emailAddress=support@dynamsoft.com...
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Previously, I talked about how to check PageRank in Java. In this article, I will combine PageRank with Excel files. To operate Excel files in Java, I used Apache POI - the Java API for Microsoft Documents. Apparently, you can download the API package, and follow the relevant tutorials to...
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In this tutorial, let’s learn how to use OpenSSL to generate X.509 certificate request. Certificate signing request is a message sent from an applicant to a certificate authority, which usually includes: Country Name (2 letter code) [US] State or Province Name (full name) [BC] Locality Name (e.g., city) [Vancouver] Organization...
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It is known that RSA is a cryptosystem which is used for the security of data transmission. This tutorial introduces how to use RSA to generate a pair of public and private keys on Windows. Download and install OpenSSL https://www.openssl.org/community/binaries.html. Find libeay32.lib, ssleay32.lib and libeay32.dll. The following sample code will...