Passing data types from C++ to Java/Java to C++

Question

What data types can be passed between c++ and java/java to c++? Also, are the data types equivalent in terms of size?

jcopenha · Accepted Answer · 2009-07-04 16:05:52Z

4

Using Java Native Interface you can pass just about anything between C++ and Java.

answered Jul 4, 2009 at 16:05

jcopenha

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3 Comments

Partial Over a year ago

and what about from java to c++?

Duck Over a year ago

JNI Supports both directions. It can be tricky and there may be better solutions for you but reading a little about JNI will answer many of your questions and is generally useful knowledge to have.

Tom Hawtin - tackline Over a year ago

JNA seems to be the popular slightly higher-level Java-native interface at the moment.

Petriborg · Accepted Answer · 2009-07-06 18:00:06Z

2

I prefer Swig myself. It does the JNI wrapping for you allowing calls in any direction you'd like, multithreading, etc. It also works with multiple languages including Java, Python, Perl etc...

Swig is also portable as your C++ code is - I use it myself on Linux and Windows to bridge our C++ code to Java and Python.

answered Jul 6, 2009 at 18:00

Petriborg

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Comments

keraba · Accepted Answer · 2009-07-04 16:26:53Z

1

Also check out CNI if using g++. Don't know if JNI is the same way, but you're basically just using C++ to write within a JVM. That is, you can't pass pure C++ objects to Java. Instead, everything must derive from Object.

answered Jul 4, 2009 at 16:26

keraba

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1 Comment

Partial Over a year ago

What do you mean by "derive from Object"?

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