Sharing output streams through a JNI interface

Posted by Chris Conway on Stack Overflow See other posts from Stack Overflow or by Chris Conway
Published on 2009-09-16T20:07:00Z Indexed on 2010/04/27 17:33 UTC
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I am writing a Java application that uses a C++ library through a JNI interface. The C++ library creates objects of type Foo, which are duly passed up through JNI to Java.

Suppose the library has an output function

    void Foo::print(std::ostream &os)

and I have a Java OutputStream out. How can I invoke Foo::print from Java so that the output appears on out? Is there any way to coerce the OutputStream to a std::ostream in the JNI layer? Can I capture the output in a buffer the JNI layer and then copy it into out?

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