Could you do it for me on this:

JNIEXPORT jfloat JNICALL Java_Functions_getattrfloat  (JNIEnv *,
jobject, jstring, jstring);

Regards
Abhijeet

same problem but with more description....................
source pasted....

Pls help me out.

Fews days back; I completed developement of a JNI module where in I
added support for few C++ native methods to be called from Java. For
those methods native method call succeeds from Java sample program ; it

works till date; But for new methods that I added into module today it
gives me java.lang.UnsatisfiedLinkError.

I used dependency viewer & I tried to find out mangled names; all
functions have something '@X' some number in the end even old methods
too!. After reading so many articles I came to know that it should be
problem with C++ compiler doing some dirty work (name mangling).
somehwhere I got the answer also; advised me to use extern "C" to
prevent that. But to my surprise, .h generated by javah -jni, contains
black extern "C". It means that compiler should not mangle the names;
but doing it! one of the functions that i added earliier "getattrnum"
works fine as explained below.

call to "getattrfloat" gives me unsatisfiedlink error.

I haven't understood 2 things. If this had been a problem of name
mangling by C++ compiler, I would have not able to call any of the
method; but call succeeds for old ones. How come?
Any other way how to prevent "MS" stupid compiler from doing this.

//java file

public class LamiaFunctions{
  public void callback(String msg){
              System.out.println(msg);
      }

  public LamiaFunctions(){
      }
public native synchronized float getattrfloat(String path,String name);
public native synchronized int getattrnum(String path,String name);

  public native synchronized void stop();
      static
      {
              System.loadLibrary("SimulatorJniWrapper");
      }
}

//java jni app program

import java.io.*;
import java.math.*;

public class Taz
{
      public static void main(String[] main_args)
      {
              LamiaFunctions fnLamia = new LamiaFunctions();
              fnLamia.start();
              try
              {
                      Thread.sleep(1000);
              }
              catch (InterruptedException ie)
              {
                      ie.printStackTrace();
              }

              try
              {
                      if(fnLamia.iscnf() == 1)
                      {
                              System.out.println("Already loaded");
                      }
                      else
                      {
                              fnLamia.loadcnf("3xSAIVL.xml");
                      }

                      System.out.println("Configuration File:
"+fnLamia.getcnf());
//below call succeeds : getattrnum
                      int i = fnLamia.getattrnum("Gas Type");
                      System.out.println(i);
                      System.out.println("\n");

//now this call fails getattrfloat, this function newly added into
native
                      float f = fnLamia.getattrfloat"Max Temp");
                      System.out.println(f);
                      System.out.println("\n");
                      fnLamia.stop();
              }
              catch(Exception ex)
              {
                      System.out.println("Exception: " + ex);
              }
      }
}

// cpp functions declarations & definitions in
SimulatorJniWrapper.cpp

JNIEXPORT jint JNICALL Java_LamiaFunctions_getattrnum
(JNIEnv *_jnienv, jobject _jobj, jstring _jpath, jstring _jattr)
{
return 1;
}

JNIEXPORT jfloat JNICALL Java_LamiaFunctions_getattrfloat
(JNIEnv *_jnienv, jobject _jobj, jstring _jpath, jstring _jname)
{
return 1.0
}

I am not able to figure out why call to first method succeeds & fails
on another.

C++ name mangled as follows:

_Java_LamiaFunctions_getattrfloat@16
_Java_LamiaFunctions_getattrnum@16

You happened to mention somewhere in your posting that use compiler
options to prevent c++ name mangling. what are those options for vc++
6.0

Any help on this will really be appriciated.

Regards
Abhijeet