Using C++ library in java

Question

I am new to this forum, so please excuse me if i cannot put my question in a right way.

I want help in using a C++(.lib and.h) files in java.
I want to use methods of that .lib file in my java code .

Prototype of function is like :

FunctionXYZ(BYTE *Data1, BYTE *Data2, BYTE *Data3, int Data4);

Environment i would be using is centOS.

Thank you in advance

P.S: I do not have source code for this .lib

Answer 1

To use functions from a .lib, you have to create JNI wrapper functions for these library functions, and then link them together with your library into a .dll.

Example:

1. Assuming you have a function in your C++ library headers with this signature:

   int example(int a, int b);
   

2. Create a function wrapper in C++:

   JNIEXPORT jint JNICALL Java_MyClass_example (JNIEnv* env, jobject obj, jint a, jint b) {
       return (jint) example(a, b);
   }
   

3. Link the library and the wrapper into a DLL

4. Create a Java class with the native method:

   public class MyClass {
       public native int example(int a, int b);
   }
   

5. Load the DLL using the System.loadLibrary function (or similar)

6. Now you can call the example method on an object of MyClass

Answer 2

you can use JNI technology which enables you to interoperate with native code

please refer to this http://www3.ntu.edu.sg/home/ehchua/programming/java/JavaNativeInterface.html