How to pass a large structure through JNI from C to JAVA

Question

Is it possible to pass a large Structure through JNI from C to Java?

Can somebody please give me the possible solutions?

Answer 1

Declare a pointer to the struct in your java class like so:

protected long ptrToX;

Next, to set it:

• Get the field ID using (*env)->GetFieldID(...)
• Get the pointer using (*env)->GetLongField(...)
• Set the pointer using (*env)->SetLongField(...)

To get it, just follow the first two steps mentioned above.

Always remember to include a finaliser that will take care of deallocating the pointer when the object is garbage-collected. Alternatively, if you do not want to incur the performance hit incurred by using finalisers, just provide a terminate() method that deallocates the pointer.

Answer 2

最好您切换到JNA，这是从C到JAVA编程的便捷方法。