通过ip获取归属地

ip.plyz.net 提供了ip查询功能,只要发送一个get请求就行了

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <WinSock2.h>
#include <iostream>
#include <stdio.h>
#include <string>
#pragma comment(lib,"Ws2_32.lib")

using namespace std;
int UTF82GBK(char* szUtf8, char* szGbk, int Len)
{
    
    int n = MultiByteToWideChar(CP_UTF8, 0, szUtf8, -1, NULL, 0);
    WCHAR* wszGBK = new WCHAR[sizeof(WCHAR) * n];
    memset(wszGBK, 0, sizeof(WCHAR) * n);
    MultiByteToWideChar(CP_UTF8, 0, szUtf8, -1, wszGBK, n);
    n = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
    if (n > Len)
    {
    
        delete[]wszGBK;
        return -1;
    }
    WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, szGbk, n, NULL, NULL);
    delete[]wszGBK;
    wszGBK = NULL;
    return 0;
}

bool getinfo()
{
    
    bool Ret = false;
    const char* hostname = "ip.plyz.net";
    struct hostent* host = gethostbyname(hostname);
    if (host==nullptr)
    {
    
        return false;
    }

    /* 初始化一个连接服务器的结构体 */
    sockaddr_in serveraddr;
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(80);

    /* 此处也可以不用这么做，不需要用gethostbyname，把网址ping一下，得出IP也是可以的 */
    serveraddr.sin_addr.S_un.S_addr = *((int*)*host->h_addr_list);
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    do
    {
    
       
        if (sock == -1)
        {
    
            break;
        }

        if (::connect(sock, (struct sockaddr*)&serveraddr, sizeof(sockaddr_in)) == -1)
        {
    
            break;
        }

        /* GET请求 */
        const char* bufSned = "GET http://ip.plyz.net/ip.ashx?ip=myip\r\n";

        /* 发送GET请求 */
        if (send(sock, bufSned, strlen(bufSned), 0) == 0)
        {
    
            break;
        }
  
        char BufRecv[100] = {
    };
        int nLen = 0;
        string HtmlData;

        /* 开始接收数据 */
        while ((nLen = recv(sock, BufRecv, 100, 0)) > 0)
        {
    
            /* 把数组拼接成string类型，方便下面的处理 */
            HtmlData += BufRecv;
        }

        char data[100] = {
     0 };
        UTF82GBK(BufRecv, data, 100);
        Ret = true;
        printf("BufRecv=%s\n", data);
    } while (false);
    if (sock!=INVALID_SOCKET)
    {
    
        closesocket(sock);
    }
    return Ret;
}
int main()
{
    
    /* 初始化 */
    WSADATA wsdata;
    WSAStartup(MAKEWORD(1, 1), &wsdata);
    getinfo();
  
    return 0;
}