Fw: Re: JNI Problem : Existing C++ Code

Rajneesh Garg Sat, 15 Apr 2000 00:43:37 -0700

Hi Harkishan,

Thanks for the timely tips. However, now I am having a new prob.

As per the tips, I have a servlet class -- jniServlet -- in which I am declaring my native function as:

public native void cFunTest(int a);

In another class -- jniCall -- I am loading the library with 'static' keyword.

The native method -- cFunTest -- is in a C++ file -- c2.cpp.

Main C++ file is c1.cpp.

c1.cpp file is successfully compiled. When I try to compile c2.cpp, it throws the error -- " cannot execute '.\c2.dll' ".

c2 is the name I have given to the Dll.

Do c2.cpp needs to have a jniCall.h include file also? I have tried with it and the compiler is giving the above error.

May be i am doing something wrong.

Hoping to be corrected...soon!!!

Regards,

Rajneesh

-----------------------------------------------Source Code of all the files-------------------------------------------------------------------------------------------------------

jniServlet.java

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class jniServlet extends HttpServlet
{
public native void cFunTest(int a);
public void init(HttpServletRequest req, HttpServletResponse res) throws ServletException
{
}

public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
{
        PrintWriter out = res.getWriter();
         out.println("This is a servlet call.");
         out.close();
        }
public void destroy()
        {
        }
}

jniCall.java

public class jniCall
{
static
{
  System.loadLibrary("c2");
}
public static void main(String args[])
{
  testDll test = new testDll();
  test.cFunTest(1234);
}
}

c2.cpp

#include <jni.h>
#include "jniServlet.h"
#include "jniCall.h"
#include <stdio.h>
#include "c1.cpp"

JNIEXPORT void JNICALL
Java_testDll_cFunTest(JNIEnv *env, jobject obj,jint abc)
{
informica* info = new informica();
info->setdate(abc);
info->getdate();
return;
}

c1.cpp

# include <iostream.h>
# include <stdio.h>
class informica
{

private: int i;
public:
   informica ()
   {
  cout<<"This is constructor";
   }
void getdate()
{
       cout<<"You entered --> "<<i<<"\n"<<"\a";
}
void setdate(int a)
{
i = a;
}
};

Fw: Re: JNI Problem : Existing C++ Code

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