C++ LNK2019 ( between project classes ) - c++

Question

I have an very strange error: when I want to use the SocialServer::Client class from my SocialServer::Server class, the linker threw me two LNK2019 errors :
Error 1 error LNK2019: unresolved external symbol "public: void __thiscall SocialServer::Client::Handle(void)" (?Handle#Client#SocialServer##QAEXXZ) referenced in function "private: static unsigned int __stdcall SocialServer::Server::listenThread(void *)" (?listenThread#Server#SocialServer##CGIPAX#Z) C:\Users\benjamin\Documents\Visual Studio 2010\Projects\FCX Social Server\SocialServer Core\Server.obj SocialServer Core
Error 2 error LNK2019: unresolved external symbol "public: __thiscall SocialServer::Client::Client(unsigned int)" (??0Client#SocialServer##QAE#I#Z) referenced in function "private: static unsigned int __stdcall SocialServer::Server::listenThread(void *)" (?listenThread#Server#SocialServer##CGIPAX#Z) C:\Users\benjamin\Documents\Visual Studio 2010\Projects\FCX Social Server\SocialServer Core\Server.obj SocialServer Core
However , these 2 missing function are correctly implemented :
Client.h
#pragma once
#include "dll.h"
namespace SocialServer
{
class __social_class Client
{
public:
Client(SOCKET sock);
~Client();
void Handle();
private:
static unsigned __stdcall clientThread(void* value);
SOCKET _socket;
uintptr_t _thread;
unsigned int _thread_id;
};
}
Client.cpp
#pragma once
#include "Client.h"
namespace SocialServer
{
Client::Client(SOCKET socket)
{
this->_socket = socket;
}
Client::~Client()
{
}
void Client::Handle()
{
std::cout << " New client " << std::endl;
this->_thread = _beginthreadex(NULL, 0, Client::clientThread, &this->_socket, CREATE_SUSPENDED, &this->_thread_id);
ResumeThread((HANDLE)this->_thread);
}
unsigned __stdcall Client::clientThread(void* value)
{
// Some code to execute here ...
}
}
Where does the problem comes from ?

Answer 1

i've found the solution.
In a function that's used by _beginthreadex() (with unsigned __stdcall) , always add a return at the end.