C++ - 해결되지 않은 외부 기호 오류

Question

저는이 주변을 검색해 왔으며이 문제로 막을 내 렸습니다.

기본적으로 내가 여기에 이러한 오류를 얻을 : 내 지식 나는 그것이 Client.obj 프로그램 컴파일지고 있지 않은지 생각으로

1>Client.obj : error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl HTTP_POST_REQUEST(char *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?HTTP_POST_REQUEST@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PADV12@1@Z) referenced in function "public: virtual void __thiscall Client::Send(void)" (?Send@Client@@UAEXXZ) 
1>G:\Development\C++\Client\Debug\Client.exe : fatal error LNK1120: 1 unresolved externals 

(이 날을 인용하지 않음)? 하지만 링크 문제 등이있을 수 있음을 읽었습니다. 나에게 그것은 내가 모든 것을 바르게 한 것처럼 보인다. (분명히 나는 ​​그렇지 않다).

Client.cpp

#include <iostream> 
#include <string> 
using namespace std; 

#include "HttpUtils.h" 
#include "Client.h" 

Client::Client() { 
    cout << "Works!" << endl; 
} 

void Client::Send() { 
    string res = HTTP_POST_REQUEST("localhost", "/test.php", "data1=data&data2=data"); 
    cout << res << endl; 
} 

Client.h이

#pragma once 

#include <string> 
using namespace std; 

#ifndef CLIENT__H 
#define CLIENT__H 

class Client { 

public: 
    Client(); 

    virtual void Send(); 
}; 
#endif 

MAIN.CPP

#include <iostream> 
#include <string> 
using namespace std; 

#include "Client.h" 

int main(int argc, char *argv[]) { 
    Client mainClient; 
    Client* client1 = &mainClient; 

    client1->Send(); 
    cin.get(); 
} 

모든 모든 도움 GREA입니다 티! 감사!

추가 코드

HttpUtils.cpp

#include <stdlib.h> 
#include <winsock.h> 
#include <sstream> 
#pragma comment (lib, "wsock32.lib") 

#include <iostream> 
#include <string> 
using namespace std; 

#include "HttpUtils.h" 

void die_with_error(char *errorMessage) { 
    cerr << errorMessage << endl; 
    cin.get(); 
    exit(1); 
} 

void die_with_wserror(char *errorMessage) { 
    cerr << errorMessage << ": " << WSAGetLastError() << endl; 
    cin.get(); 
    exit(1); 
} 

string HTTP_POST_REQUEST(char *hostname, string path, string data) { 
    string request; 
    string response; 
    int resp_leng; 

    char buffer[BUFFERSIZE]; 
    struct sockaddr_in serveraddr; 
    int sock; 

    WSADATA wsaData; 
    hostent *remoteHost; 
    int port = 80; 

    stringstream ss; 
    ss << data.length(); 

    stringstream request2; 
    request2 << "POST " << path << " HTTP/1.1" << endl; 
    request2 << "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)" << endl; 
    request2 << "Host: " << hostname << endl; 
    request2 << "Content-Length: " << data.length() << endl; 
    request2 << "Content-Type: application/x-www-form-urlencoded" << endl; 
    request2 << "Accept-Language: en-uk" << endl; 
    request2 << endl; 
    request2 << data; 
    request = request2.str(); 

    cout << request << endl << "###################################################" << endl << endl; 

    // Init WinSock. 
    if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) 
     die_with_wserror("WSAStartup() failed"); 

    // Open socket. 
    if ((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) 
     die_with_wserror("socket() failed"); 


    // Convert hostname into IP 
    remoteHost = gethostbyname(hostname); 
    char *temp; 
    if (remoteHost != NULL) { 
     temp = remoteHost->h_addr_list[0]; 
    } else { 
     temp = NULL; 
     return "Error: Invalid hostname passed to HTTP_POST()."; 
    } 


    // Connect. 
    memset(&serveraddr, 0, sizeof(serveraddr)); 
    serveraddr.sin_family = AF_INET; 

    int i = 0; 
    if (remoteHost->h_addrtype == AF_INET) 
    { 
     while (remoteHost->h_addr_list[i] != 0) { 
      serveraddr.sin_addr.s_addr = *(u_long *)remoteHost->h_addr_list[i++]; 
     } 
    } 

    serveraddr.sin_port = htons((unsigned short)port); 
    if (connect(sock, (struct sockaddr *) &serveraddr, sizeof(serveraddr)) < 0) 
     die_with_wserror("connect() failed"); 

    // Send request. 
    if (send(sock, request.c_str(), request.length(), 0) != request.length()) 
     die_with_wserror("send() sent a different number of bytes than expected"); 

    // Get response. 
    response = ""; 
    resp_leng = BUFFERSIZE; 
    while (resp_leng == BUFFERSIZE) 
    { 
     resp_leng = recv(sock, (char*)&buffer, BUFFERSIZE, 0); 
     if (resp_leng>0) 
      response += string(buffer).substr(0, resp_leng); 
     //note: download lag is not handled in this code 
    } 

    // Disconnect 
    closesocket(sock); 

    // Cleanup 
    WSACleanup(); 

    //response.erase(0, 184); 
    return response; 
} 

HttpUtils.h

#pragma once 

#include <iostream> 
#include <string> 
using namespace std; 

#ifndef HTTP_UTILS__H 
#define HTTP_UTILS__H 
#define BUFFERSIZE 1024 
void die_with_error(char *errorMessage); 
void die_with_wserror(char *errorMessage); 

string HTTP_POST_REQUEST(char *hostname, string path, string data); 
#endif 

Answer 1

당신이 당신의 메이크업 파일/명령에 HttpUtils.cpp를 추가해야합니다. HttpUtils.cpp가 컴파일되지 않은 것처럼 들립니다. 그래서 클라이언트가 HttpUtils 기호를 찾을 수 없습니다!