WSAStartup函数如何启动Winsock DLL的使用？

WSADATA

WSDATA

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32")

void Run(int argc, char* argv[])
{
    char* host = argc < 2 ? "" : argv[1];
    struct hostent* entry = gethostbyname(host);

    if(entry)
    {
        struct in_addr* addr = (struct in_addr*) entry->h_addr;
        printf("IP Address: %sn", inet_ntoa(*addr));
    }
    else
        printf("ERROR: Resolution failure.n");
}

int main(int argc, char* argv[])
{
    WSADATA wsaData;

    if(WSAStartup(0x202, &wsaData) == 0)
    {
        Run(argc, argv);
        WSACleanup();
    }
    else
        printf("ERROR: Initialization failure.n");
}

WSAStartup()

WSADATA

wsaData

wsaData