Existing DLL

Question

Hi guys. Ive done a succesfully some JNI examples on the web.
I have a c++ application together with the dll given. I do not know how to implement JNI onto the application.
anyone can help me in this?
btw the c++ is an AXIS camera API application.
thanks in advance.

Answer 1

Here is an example where I call a constructor that exists in the dll, 'TestClass' and then I pass back to the java side a pointer to the instance of TestClass.
#include <jni.h>
#include <jni_md.h>
#include <stdio.h>
#include "HelloWorld.h"
#include "TestClass.h"
JNIEXPORT jint JNICALL Java_HelloWorld_createTestClass(JNIEnv *env, jobject jobj, jint a, jint b)
       TestClass * tc = new TestClass(a, b);
       int y = reinterpret_cast<int>(tc);
       printf("Pointer: %i \n", y);
       return (jint)y;
  }In this case I'm using the java native method createTestClass to call the constructor for the TestClass object in the dll. So createTestClass wraps the TestClass constructor.
What are you using to compile the dll for the JNI? When you make the JNI dll, if it is supposed to access another library, you should include that library in the compile.
Message was edited by:
csb42