#pragma once
#include <Windows.h>
#include <winsock.h>
#include <sstream>
#include <iostream>
#pragma comment(lib,"ws2_32.lib")class WinHttp
{
public:WinHttp(){//此处一定要初始化一下，否则gethostbyname返回一直为空;WSADATA wsa = { 0 };if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0){std::cout << "init WSADATA failed!" << std::endl;}}~WinHttp(){}public:void PostData(std::string host, int port, std::string path, std::string post_content){//POST请求方式;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-Type:application/json\r\n";stream << "Content-Length:" << post_content.length() << "\r\n";stream << "Connection:close\r\n\r\n";stream << post_content.c_str();Http(host, port, stream.str());}void GetData(std::string host, int port, std::string path, std::string get_content){//GET请求方式;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";Http(host, port, stream.str());}private:void Http(std::string host, int port, std::string request){int sockfd;struct sockaddr_in address;sockfd = socket(AF_INET, SOCK_STREAM, 0);address.sin_family = AF_INET;address.sin_port = htons(port);address.sin_addr.S_un.S_addr = inet_addr(host.c_str()); //直接填写地址;/*struct hostent *server = gethostbyaddr(host.c_str(), host.size(), AF_INET);//struct hostent *server = gethostbyname(host.c_str());if (!server){switch (h_errno){case HOST_NOT_FOUND:fputs("The host was not found.\n", stderr);break;case NO_ADDRESS:fputs("The name is valid but it has no address.\n", stderr);break;case NO_RECOVERY:fputs("A non-recoverable name server error occurred.\n", stderr);break;case TRY_AGAIN:fputs("The name server is temporarily unavailable.", stderr);break;default:break;}std::cout << "gethostbyaddr(...) failed!" << std::endl;return;}memcpy((char *)&address.sin_addr.s_addr, (char*)server->h_addr, server->h_length);*/if (-1 == connect(sockfd, (sockaddr *)&address, sizeof(address))){std::cout << host << ":" << port << " connection failed!" << std::endl;return;}//std::cout << request << std::endl;send(sockfd, request.c_str(), request.size(), 0);char buf[1024 * 2] = { 0 }; //不能设置过大，否则会栈溢出，如果必须设置较大，用堆new；//char *buf = new char(1024 * 1024);int offset = 0;int rc;while (rc = recv(sockfd, buf + offset, 1024, 0)){offset += rc;}buf[offset] = 0; //最后结束符;closesocket(sockfd); //断开;std::cout << "recv: " << buf << std::endl;//delete[] buf;}inline char* UnicodeToUtf8(const wchar_t* unicode){ // Unicode 转 UTF-8int len;len = WideCharToMultiByte(CP_UTF8, 0, unicode, -1, NULL, 0, NULL, NULL);char *szUtf8 = (char*)malloc(len + 1);memset(szUtf8, 0, len + 1);WideCharToMultiByte(CP_UTF8, 0, unicode, -1, szUtf8, len, NULL, NULL);return szUtf8;}
};

使用方法如下：

WinHttp *http = new WinHttp();
http->getData("127.0.0.1", 8080, "/login", "id=admin&pw=123");
http->postData("127.0.0.1", 8080, "/login","id=admin&pw=123");

当然，前题要有Ｗeb后台；