how to call function in Java?

how to call java function from c++?

  • Hello all how can i call java function from c++ application ( not using cmd methods.. ) Thanks

  • Answer:

    As an example, check http://www.inonit.com/cygwin/jni/invocationApi/c.html. It shows a sample procedure to create a JVM and invoke a method. If the JVM already exists; e.g. your C program is invoked by the Java program (callback situation), you can cache the JNIEnv* pointer. As an advice, be careful caching pointers to the JVM from C/C++, there are some semantics involved as to what you can cache and it could be invoked later on. For that, as Brian Agnew pointed out, check the JNI reference.

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Check out the http://java.sun.com/docs/books/jni/html/invoke.html. This will allow you to embed a JVM within your C (or C++) application. Note that various easier mechanisms exist to facilitate calling C/C++ from Java (e.g. https://jna.dev.java.net/). It may be worth considering inverting your problem such that you can call from Java (I understand this may well not be possible for your particular application, however)

Brian Agnew

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