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我在代碼中收到以下錯誤，並且我不確定爲什麼'socketfd'在client.hpp中聲明並在構造函數中使用client.cpp，但後來當我嘗試並在稍後使用它時出現錯誤。C 11錯誤：在此範圍內未聲明'X'
端子輸出：
g++ client.cpp -o client.o -pthread -c -std=c++11
client.cpp: In function ‘void sendMessage(std::string)’:
client.cpp:37:23: error: ‘socketfd’ was not declared in this scope
client.hpp
#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <netdb.h>
class Client {
public:
Client();
~Client();
void sendMessage(std::string);
private:
int status, socketfd;
struct addrinfo host_info;
struct addrinfo *host_info_list;
};
client.cpp
#include "client.hpp"
Client::Client() {
memset(&host_info, 0, sizeof host_info);
std::cout << "Setting up the structs..." << std::endl;
host_info.ai_family = AF_UNSPEC;
host_info.ai_socktype = SOCK_STREAM;
status = getaddrinfo("192.168.1.3", "8888", &host_info, &host_info_list);
if (status != 0) {
std::cout << "getaddrinfo error " << gai_strerror(status);
}
std:: cout << "Creating a socket..." << std::endl;
socketfd = socket(host_info_list->ai_family, host_info_list->ai_socktype, host_info_list->ai_protocol);
if (socketfd == -1) {
std::cout << "Socket Errror ";
}
std::cout << "Connecting..." << std::endl;
status = connect(socketfd, host_info_list->ai_addr, host_info_list->ai_addrlen);
if (status == -1) {
std::cout << "Connect Error" << std::endl;
}
std::cout << "Successfully Connected" << std::endl;
}
Client::~Client() {
}
void sendMessage(std::string msg) {
std::cout << "Sending Message: " << msg << std::endl;
int len;
ssize_t bytes_sent;
len = strlen(msg.c_str());
bytes_sent = send(socketfd, msg.c_str(), len, 0);
}
這是一些第一的C++我已經做了，我有點困惑，爲什麼我得到這個錯誤。