24
首先，我知道这个问题是遍布这个网站，但我看过几乎所有的人，似乎无法找出什么是错的。这是在VS 2012.谢谢。解析外部符号LNK2019
//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);
};
这里的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);
}
}
而这里的stdafx.h中
#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"
这里是我的错误信息：
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 [email protected] referenced in function "public: void __thiscall ServerSocket::Listen(void)" ([email protected]@@QAEXXZ)
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: void __thiscall ServerSocket::Bind(int)" ([email protected]@@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: void __thiscall Socket::CloseConnection(void)" ([email protected]@@QAEXXZ)
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: void __thiscall ClientSocket::ConnectToServer(char const *,int)" ([email protected]@@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: void __thiscall ServerSocket::Bind(int)" ([email protected]@@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol __imp__inet_a[email protected] referenced in function "public: void __thiscall ServerSocket::Bind(int)" ([email protected]@@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: void __thiscall ServerSocket::Listen(void)" ([email protected]@@QAEXXZ)
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: bool __thiscall Socket::RecvData(char *,int)" ([email protected]@@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: bool __thiscall Socket::SendData(char *)" ([email protected]@@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: __thiscall Socket::Socket(void)" ([email protected]@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: __thiscall Socket::Socket(void)" ([email protected]@[email protected])
1>Socket.obj : error LNK2019: unresolved external symbol [email protected] referenced in function "public: __thiscall Socket::Socket(void)" ([email protected]@[email protected])
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 ==========
你加WS2_32.LIB到你的链接器/输入设置您的附加依赖的一部分？ – drescherjm
不......我想试试，回到这个职位 – Iowa15
您可以用这种方式添加它 - 的#pragma评论（LIB，“WS2_32.LIB”） – SChepurin