c++ - 无法连接到 SMTP 服务器

Question

我创建了一个简单的代码来连接到 Gmail SMTP 服务器，但是函数 connect() 返回 -1 (SOCKET_ERROR)。这段代码有什么问题？

#include <iostream>
#include <winsock2.h>
#include <ws2tcpip.h>

int main()
{
    WSADATA wsaData;
    sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = inet_addr("smtp.gmail.com");
    addr.sin_port = htons(587);

    //WSA STARTUP
    if (WSAStartup(MAKEWORD(2, 2), &wsaData))
    {
        std::cout << "Failed to startup wsa.\n";
        return 1;
    }

    // GNIAZDO DLA KLIENTA
    SOCKET mSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (mSocket == INVALID_SOCKET)
    {
        std::cout << "Socket error: " << WSAGetLastError();
        WSACleanup();
        return 1;
    }
    //LACZENIE Z SERWEREM
    int status = connect(mSocket, (SOCKADDR*)&addr, sizeof(addr));
    std::cout << "Connection status: " << status;

    return 0;
}

Answer 1

inet_addr 需要一个点表示法的 IP 地址，如 "1.2.3.4"。它不解析域名。您正在寻找getaddrinfo