http 协议 c++代码 获取网页

最近接触了些 html 和 JavaScript，索性了解下 http 协议。在园子里找到了 HTTP协议详解，图文并茂，很爽！

于是小小的尝试了下

#include <WinSock2.h>
#include <iostream>
#include <string>
#include <fstream>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

const int		g_nPort		= 80;
const string	g_strAddr	= "www.cnblogs.com";
const string	g_strPath	= "/hangj/";

int main(int argc, char* argv[])
{
	WSADATA	WSAData;
	if (WSAStartup(MAKEWORD(2,2), &WSAData)){
		printf("initializationing error!\n");
		WSACleanup();
		exit(-1);
	}

	struct hostent	*he;
	if ((he = gethostbyname(g_strAddr.c_str()))==NULL){
		printf("gethostbyname failed.\n");
		WSACleanup();
		exit(-1);
	}

	struct sockaddr_in		CliAddr = {0};
	CliAddr.sin_family		= AF_INET;
	CliAddr.sin_port		= htons(g_nPort);
	CliAddr.sin_addr		= *((struct in_addr*)he->h_addr_list[0]);
	cout <<"ip: "<< inet_ntoa(*(struct in_addr*)he->h_addr_list[0]) <<endl;

	int sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == sockfd){
		printf("socket failed.\n");
		WSACleanup();
		exit(-1);
	}
	if (0 > connect(sockfd, (struct sockaddr*)&CliAddr, sizeof(CliAddr))){
		printf("connect failed.\n");
		WSACleanup();
		exit(-1);
	}
	string strSend="";
	strSend += "GET " + g_strPath + " HTTP/1.1\n";	// URL
	strSend += "Host: " + g_strAddr + "\n\n";		// Host

	char bufSend[1024]={0};
	sprintf(bufSend, "%s", strSend.c_str());
	if (0 > send(sockfd, bufSend, strlen(bufSend), 0)){
		printf("send failed.\n");
		WSACleanup();
		exit(-1);
	}

	ofstream os("hangj.html");

	char bufRecv[10]={0};
	int nRet=0;
	printf("recv: \n");
	while (sizeof(bufRecv)-1 <= (nRet=recv(sockfd, bufRecv, sizeof(bufRecv)-1, 0))){
		bufRecv[nRet] = 0;
		printf("%s", bufRecv);
		os << bufRecv;
	}
	bufRecv[nRet] = 0;
	printf("%s\n", bufRecv);
	os << bufRecv;

	os.close();
　　　　　closesocket(sockfd);
	WSACleanup();
	getchar();
	return 0;
}