純C++實現的HTTP請求（POST/GET），支援windows和linux，
進行簡單的封裝， 方便呼叫。實現如下：

#include "HttpConnect.h"

#ifdef WIN32
#pragma comment(lib,"ws2_32.lib")
#endif

HttpConnect::HttpConnect()
{
#ifdef WIN32
    //此處一定要初始化一下，否則gethostbyname返回一直為空
    WSADATA wsa = { 0 };
    WSAStartup(MAKEWORD(2, 2), &wsa);
#endif
}

HttpConnect::~HttpConnect()
{

}
void
 
 HttpConnect::socketHttp(std::string host, std::string request)
{
    int sockfd;
    struct sockaddr_in address;
    struct hostent *server;

    sockfd = socket(AF_INET,SOCK_STREAM,0);
    address.sin_family = AF_INET;
    address.sin_port = htons(80);
    server = gethostbyname(host.c_str());
    memcpy
 
((char *)&address.sin_addr.s_addr,(char*)server->h_addr, server->h_length);

    if(-1 == connect(sockfd,(struct sockaddr *)&address,sizeof(address))){
        DBG <<"connection error!"<<std::endl;
        return;
    }

    DBG << request << std::endl;
#ifdef WIN32
 

    send(sockfd, request.c_str(),request.size(),0);
#else
    write(sockfd,request.c_str(),request.size());
#endif
    char buf[1024*1024] = {0};


    int offset = 0;
    int rc;

#ifdef WIN32
    while(rc = recv(sockfd, buf+offset, 1024,0))
#else
    while(rc = read(sockfd, buf+offset, 1024))
#endif
    {
        offset += rc;
    }

#ifdef WIN32
    closesocket(sockfd);
#else
    close(sockfd);
#endif
    buf[offset] = 0;
    DBG << buf << std::endl;

}

void HttpConnect::postData(std::string host, std::string path, std::string post_content)
{
    //POST請求方式
    std::stringstream stream;
    stream << "POST " << path;
    stream << " HTTP/1.0\r\n";
    stream << "Host: "<< host << "\r\n";
    stream << "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3\r\n";
    stream << "Content-Type:application/x-www-form-urlencoded\r\n";
    stream << "Content-Length:" << post_content.length()<<"\r\n";
    stream << "Connection:close\r\n\r\n";
    stream << post_content.c_str();

    socketHttp(host, stream.str());
}

void HttpConnect::getData(std::string host, std::string path, std::string get_content)
{
    //GET請求方式
    std::stringstream stream;
    stream << "GET " << path << "?" << get_content;
    stream << " HTTP/1.0\r\n";
    stream << "Host: " << host << "\r\n";
    stream <<"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3\r\n";
    stream <<"Connection:close\r\n\r\n";

    socketHttp(host, stream.str());
}

呼叫方法：

    HttpConnect *http = new HttpConnect();
    http->getData("127.0.0.1", "/login", "id=liukang&pw=123");
    http->postData("127.0.0.1", "/login","id=liukang&pw=123");