Integrating native C++ class in a java program

Question

Hello,I have a class written in C++, such as this one, myclass.cpp and myclass.h:
myclass.cpp:
#include <iostream.h>
#include "myclass.h"
myclass::myclass( int x ) {
cout << "Class created with " << x << " parameter" << endl;
void myclass:message( char *message ) {
cout << "Message: " << message << endl;
and the myclass.h is:
#ifndef MYCLASS
#define MYCLASS
class myclass {
public:
myclass( int );
void message( char * );
#endif
I want to create a java program that calls this C++ class, in which I can write the "message" and the "x"...
how can I do it?
thanx

Answer 1

I am afraid I do not know the coding conventions for other systems than Windows (well, not anymore).
I can only tell you, though, how I do that in C++ for Windows.
1. I write the function signatures in Java:
public class JavaClass{
public native type_fun name_fun(param_list);
2. In the same class, I make a static contructor:
static {
System.loadLibrary("library_name");
// !!! no extenstion! only the name of the dll (or shared library)
3. I compile with javac.
4. I generate a header:
javah -jni JavaClass
This makes a file JavaClass.h - if everything works well.
5. I provide an implementation for the function(s) in this header, in a file JavaClass.cpp. In the cpp file, I include the header which declares your C++ class. In the implementation of the (exposed) function, I create an instance of that class.
6. I compile the C++ part and make a dll out of it; I make sure that this dll is in a directory which is in the $path (%path%) environment variable.
That's it.
I think, though, that this process is described in one of the online tutorials.
Petru