JNI mapping structure in java

Question

I have a dll which has a method for e.g void abc(meth* myMeth) and a structure

struct meth
{
  int a;
  char b[255]; 
}

The above code code is written in c. I need to map this to Java through JNI, and I am stuck. How can I pass a reference to the method abc as a pointer from a Java method, and how can I set the values of a and b and then pass back to Java again? Need An Urgent Help....Thanks

http://stackoverflow.com/questions/3923299/how-to-pass-c-structs-back-and-forth-to-java-code-in-jni/4002158#4002158 — qrtt1, Oct 25 '10 at 15:05

score 2 · Answer 1 · answered Oct 25 '10 at 14:11

I do not know if this is an option for you, but consider using some higher level framework for managing the low-level details of JNI for you. Two options:

JNAerator, see also "Structs" chapter in reference documentation.
SWIG, see also "Structures and unions" chapter in reference documentation.

Personally I have used JNAerator and found it really helpful.

score 1 · Answer 2 · answered Oct 25 '10 at 14:08

1

There is no mapping between Java classes and C structs (not sure about how JNA handles this); you'll have to create a Java class with the same members as your C struct and write C functions to convert between them.

answered Oct 25 '10 at 14:08

lhballoti

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7
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@lhballoti...i have done with this process and i think it mapped quite well. – msm Oct 27 '10 at 10:53

JNI mapping structure in java

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