c++ - Símbolo externo no resuelto LNK2019

visual-studio linker

Question

Antes que nada, sé que esta pregunta está en todo este sitio, pero he examinado casi todos y parece que no puedo descubrir qué está mal. Esto es en VS 2012. Gracias.

//Socket.h
#pragma once
#include <iostream>
#include <WinSock2.h>
using namespace std;
const int STRLEN = 256;
class Socket
{
protected:
WSADATA wsaData;
SOCKET mySocket;
SOCKET myBackup;
SOCKET acceptSocket;
sockaddr_in myAddress;
public:
Socket();
~Socket();
bool SendData( char* );
bool RecvData( char*, int );
void CloseConnection();
void GetAndSendMessage();
};
class ServerSocket : public Socket
{
public:
void Listen();
void Bind( int port );
void StartHosting( int port );
};
class ClientSocket : public Socket
{
public:
void ConnectToServer( const char *ipAddress, int port );
};

Aquí está Socket.cpp

//Socket.cpp
#include "stdafx.h"
#include "Socket.h"
Socket::Socket()
{
if( WSAStartup( MAKEWORD(2, 2), &wsaData ) != NO_ERROR )
{
cerr<<"Socket Initialization: Error with WSAStartup/n";
system("pause");
WSACleanup();
exit(10);
}
//Create a socket
mySocket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );
if ( mySocket == INVALID_SOCKET )
{
cerr<<"Socket Initialization: Error creating socket"<<endl;
system("pause");
WSACleanup();
exit(11);
}
myBackup = mySocket;
}
Socket::~Socket()
{
WSACleanup();
}
bool Socket::SendData( char *buffer )
{
send( mySocket, buffer, strlen( buffer ), 0 );
return true;
}
bool Socket::RecvData( char *buffer, int size )
{
int i = recv( mySocket, buffer, size, 0 );
buffer[i] = ''/0'';
return true;
}
void Socket::CloseConnection()
{
//cout<<"CLOSE CONNECTION"<<endl;
closesocket( mySocket );
mySocket = myBackup;
}
void Socket::GetAndSendMessage()
{
char message[STRLEN];
cin.ignore();//without this, it gets the return char from the last cin and ignores the following one!
cout<<"Send > ";
cin.get( message, STRLEN );
SendData( message );
}
void ServerSocket::StartHosting( int port )
{
Bind( port );
Listen();
}
void ServerSocket::Listen()
{
//cout<<"LISTEN FOR CLIENT..."<<endl;
if ( listen ( mySocket, 1 ) == SOCKET_ERROR )
{
cerr<<"ServerSocket: Error listening on socket/n";
system("pause");
WSACleanup();
exit(15);
}
//cout<<"ACCEPT CONNECTION..."<<endl;
acceptSocket = accept( myBackup, NULL, NULL );
while ( acceptSocket == SOCKET_ERROR )
{
acceptSocket = accept( myBackup, NULL, NULL );
}
mySocket = acceptSocket;
}
void ServerSocket::Bind( int port )
{
myAddress.sin_family = AF_INET;
myAddress.sin_addr.s_addr = inet_addr( "0.0.0.0" );
myAddress.sin_port = htons( port );
//cout<<"BIND TO PORT "<<port<<endl;
if ( bind ( mySocket, (SOCKADDR*) &myAddress, sizeof( myAddress) ) == SOCKET_ERROR )
{
cerr<<"ServerSocket: Failed to connect/n";
system("pause");
WSACleanup();
exit(14);
}
}
void ClientSocket::ConnectToServer( const char *ipAddress, int port )
{
myAddress.sin_family = AF_INET;
myAddress.sin_addr.s_addr = inet_addr( ipAddress );
myAddress.sin_port = htons( port );
//cout<<"CONNECTED"<<endl;
if ( connect( mySocket, (SOCKADDR*) &myAddress, sizeof( myAddress ) ) == SOCKET_ERROR )
{
cerr<<"ClientSocket: Failed to connect/n";
system("pause");
WSACleanup();
exit(13);
}
}

Y aquí está stdafx.h

#pragma once
#include "targetver.h"
#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
// Windows Header Files:
#include <windows.h>
// C RunTime Header Files
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
// TODO: reference additional headers your program requires here
#include "Socket.h"

Y aquí están mis mensajes de error:

1>------ Build started: Project: Client, Configuration: Debug Win32 ------
1> stdafx.cpp
1> Socket.cpp
1> Client.cpp
1> Generating Code...
1>Socket.obj : error LNK2019: unresolved external symbol __imp__accept@12 referenced in function "public: void __thiscall ServerSocket::Listen(void)" (?Listen@ServerSocket@@QAEXXZ)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__bind@12 referenced in function "public: void __thiscall ServerSocket::Bind(int)" (?Bind@ServerSocket@@QAEXH@Z)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__closesocket@4 referenced in function "public: void __thiscall Socket::CloseConnection(void)" (?CloseConnection@Socket@@QAEXXZ)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__connect@12 referenced in function "public: void __thiscall ClientSocket::ConnectToServer(char const *,int)" (?ConnectToServer@ClientSocket@@QAEXPBDH@Z)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__htons@4 referenced in function "public: void __thiscall ServerSocket::Bind(int)" (?Bind@ServerSocket@@QAEXH@Z)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__inet_addr@4 referenced in function "public: void __thiscall ServerSocket::Bind(int)" (?Bind@ServerSocket@@QAEXH@Z)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__listen@8 referenced in function "public: void __thiscall ServerSocket::Listen(void)" (?Listen@ServerSocket@@QAEXXZ)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__recv@16 referenced in function "public: bool __thiscall Socket::RecvData(char *,int)" (?RecvData@Socket@@QAE_NPADH@Z)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__send@16 referenced in function "public: bool __thiscall Socket::SendData(char *)" (?SendData@Socket@@QAE_NPAD@Z)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__socket@12 referenced in function "public: __thiscall Socket::Socket(void)" (??0Socket@@QAE@XZ)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__WSAStartup@8 referenced in function "public: __thiscall Socket::Socket(void)" (??0Socket@@QAE@XZ)
1>Socket.obj : error LNK2019: unresolved external symbol __imp__WSACleanup@0 referenced in function "public: __thiscall Socket::Socket(void)" (??0Socket@@QAE@XZ)
1>C:/Users/ajayp_000/documents/visual studio 2012/Projects/Client/Debug/Client.exe : fatal error LNK1120: 12 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Answer 1

El problema es que no está enlazando con la biblioteca Ws2_32.lib. Para solucionarlo, puede agregarlo a la pestaña de dependencias adicionales de la configuración de Enlazador / Entrada para su proyecto. Alternativamente (como lo señala SChepurin en los comentarios) puede agregar

#pragma comment(lib, "Ws2_32.lib")

a un archivo fuente de su proyecto.