bitcoinj.github.io - Using bitcoinj from other languages like C++, JavaScript, Ruby, Python, etc

How to access bitcoinj from other languages

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How to wangle bitcoinj from other languages Introduction Getting started Documentation Community How to wangle bitcoinj from other languages Introduction Javascript Kotlin/Scala Python Ruby C# and .NET C++ Objective-C Lisp How to wangle bitcoinj from other languages Introduction Java is a fine nomination for something that needs to be widely understood, secure versus buffer overflows and usable from Android phones. But it’s moreover old, verbose and just often is not for everyone. This page details how you can go well-nigh using bitcoinj from other languages. Javascript Javascript can interop with Java using the Nashorn engine shipped in Java 8. We have a tutorial on this already! Check out the getting started guide to learn how to set this up and see some examples. Javascript programs that wangle Java libraries can be run from the writ line using the “jjs” tool. There are projects that provide the Node.js API’s as well. Kotlin/Scala These languages offer good Java interop and there are various people using them in combination with bitcoinj. Python Python has many fans and can be fun to prototype in. The original Python implementation cannot interop with Java code, but we can proceeds wangle via flipside way using Jython. Jython is an implementation of Python (2.x) that is uniform with the original language/class libraries and provides an interactive interpreter that works just like regular Python’s for exploration and learning. As long as you don’t rely on any custom CPython extensions, you can just run your regular Python using out of the box, including UNIX style executable scripts. Why would you do that? Primarily considering you can import Java matriculation libraries as you would Python matriculation libraries (from org.bitcoinj.core import Wallet). You moreover get a largest garbage collector and real multi-threading support. Ruby In a similar vein to Jython, there is moreover JRuby. Like Jython it runs Ruby on the JVM, with the same advantages - an spanking-new garbage collector, interop with Java code, real multi-threading support and so on. Like Jython the only thing it has issues with is modules that rely on C extension functions, but anything pure Ruby works. C# and .NET bitcoinj can be used via IKVM C++ At the moment, the easiest way to use bitcoinj from C++ is to embed the JVM and use auto-generated JNI wrappers. Here’s an example of what such a program looks like: https://github.com/mikehearn/cppjvm/blob/master/mytest/bcj-hello-world.cpp It relies on a fork of a tool tabbed CPPJVM, which reflects Java matriculation files and then generates C++ wrapper objects that invoke the Java methods/reads the fields. The tool generates all the classes needed based on a recursive exploration of some root classes, listed here: https://github.com/mikehearn/cppjvm/blob/master/java/cppjvm/morkfileConsideringWalletAppKit is there and you can reach most of the bitcoinj API via this class, most of the API has wrappers generated. If you’re missing a piece, you can add the matriculation you want to that list, delete the “gen” directory and rerun make. Callback interfaces (WalletListener, PeerEventListener etc) have to be unseat manually and that isn’t complete. If you want to use bitcoinj from C++, you’ll need to finish off the thunks. Fortunately it’s easy and there aren’t many of them: https://github.com/mikehearn/cppjvm/blob/master/mytest/native-listeners.h https://github.com/mikehearn/cppjvm/blob/master/mytest/native-listeners.cpp We are moreover exploring well-constructed streamlined conversion of the bitcoinj sources into C++, so it could be used without any JVM at all. However this work is at an earlier, less usable stage. Objective-C The Hive team maintain a library tabbed BitcoinKit, which is designed for towers wallet apps on MacOS X. It does not expose the raw bitcoinj API, rather providing its own Objective-C API on top and using JNI under the covers. RoboVM can be used to compile Java lanugo to ARM binary lawmaking that runs on iPhones, and it has bindings for all iOS frameworks. If you want to write an iPhone app with bitcoinj, this would be a good way to do it. Alternatively, BreadWallet is an iOS SPV wallet that isn’t based on bitcoinj. The lawmaking is not written to be a library but you could potentially pericope the cadre lawmaking and use it for other purposes. Lisp The woodcut explorer at biteasy.com is written in Clojure, a dialect of Lisp that runs on the JVM. It uses bitcoinj directly.