You should consider Boost.Python if you are not planning to generate bindings for other languages as well with swig. If you have a lot of functions and classes to bind, Py++ is a great tool that automatically generates the needed code to make the bindings. Pybindgen may also be an option, but it’s a new … Read more
The easiest way to do this is to wrap your arrays inside a struct, which can then provide extra methods to meet the “subscriptable” requirements. I’ve put together a small example. It assumes you’re using C++, but the equivalent C version is fairly trivial to construct from this, it just requires a bit of repetition. … Read more
The simplest solution to this is to implement __getitem__ and throw an IndexError exception for an invalid index. I put together an example of this, using %extend and %exception in SWIG to implement __getitem__ and raise an exception respectively: %module test %include “exception.i” %{ #include <assert.h> #include “test.h” static int myErr = 0; // flag … Read more
You don’t really want to be touching java.util.Vector with your wrapped interfaces because you will end up duplicating storage or making large numbers of copy operations every time you pass it in/out of a function. (Note also that in general in C++ inhering from containers is odd design). Instead in Java the “right” thing to … Read more
The appropriate base type for wrapping std::vector in Java is java.util.AbstractList. Using java.util.Vector as a base would be odd because you’d end up with two sets of storage, one in the std::vector, and one in the java.util.Vector. The reason SWIG doesn’t do this for you though is because you can’t have AbstractList<double> in Java, it … Read more
At the most basic level you can make code that works using the cpointer.i part of the SWIG library to allow a direct “pointer to pointer” object to be created in Java. For example given the header file: #include <stdlib.h> typedef struct sp_session sp_session; typedef struct {} sp_session_config; typedef int sp_error; inline sp_error sp_session_create(const sp_session_config … Read more
The crux of this is that to wrap either of these functions you’ll want to use a multi-argument typemap. The preamble is pretty standard for SWIG. I used my personal favourite prgama to automatically load the shared library without the user of the interface needing to know: %module test %{ #include “test.hh” %} %pragma(java) jniclasscode=%{ … Read more
You can achieve what you’re looking for with SWIG+Java using “Directors“, however it’s not quite as straightforward mapping from the C++ abstract classes onto Java as you might hope. My answer therefore is split into three parts – firstly the simple example of implementing a C++ pure virtual function in Java, secondly an explanation of … Read more
Step-by-step instructions. This assumes you have the source and are building a single DLL extension that links the source directly into it. I didn’t go back through it after creating a working project, so I may have missed something. Comment on this post if you get stuck on a step. If you have an existing … Read more
I am currently working on an Android application which streams radio. I use native decoder library which is called aacdecoder. Everything was fine till app gets crash error on some Android devices. It was really annoying. Because app was perfectly plays radio streams almost all devices but Samsung S6 and S6 Edge. Crash report says … Read more