Use imported dll inner class methods in c++ - c++

Question

I've got a problem using 3rd party .dll library:
That library has some class with methods I need to use in my compiled .dll via JNI from my Java app.
I'm trying to declare something like that :
#ifdef SERVER_EXPORTS
#define SERVER_API __declspec(dllexport)
#else
#define SERVER_API __declspec(dllimport)
#endif
namespace MYDLLNAMESPACE
{
class SERVER_API IServer
{
public:
int NFun(int func);
};
class SERVER_API ServerClass : public IServer {
public:
ServerClass();
int NFun(int func) {
return MYDLLNAMESPACE::ServerClass::NFun(func);
}
};
}
Ant then use it in code like :
IServer *Myserv = new Server();
int a = Myserv->NFun(5007);
return a;
but it goes to the error "error LNK2019: unresolved external symbol "__declspec(dllimport) public: int __thiscall MYDLLNAMESPACE::IServer:"
I need to do something like:
Iserver myServer = new Server();
int result = myServer.do_smth();
return result;
where Server is MYDLL.dll --> namespace MYDLLNAMESPACE --> class Server
Is there any ways how to do it?
P.S. I haven't any .lib of .h files of 3rd party .dll
EDIT:
Now I've got Server.h file :
namespace NS {
class __declspec(dllexport) ServerClass
{
public:
ServerClass() {
}
const char* GParam(const char* key);
const char* SParam(const char* key, const char* value);
};
}
And my Impl.cpp file, where I tryin' to instantiate ServerClass and use its method 'GParam' like this:
ServerClass *serv = new ServerClass();
const char* str = serv->GParam("LastErrorTxt");
but it goes to StackOverFlowException, seems like serv->GParam("LastErrorTxt") is executing itself instead of dll class implementation

Answer 1

Problem is solved by using com4j:
http://com4j.kohsuke.org/