Win32 - Google浏览器

////////////////////////////////////////////////////////////////////
//
// ping百度 拿到一个IP 浏览器发送一个get请求
// 百度的服务器接收到了请求 返回一些东西给你
// 返回的东西就是我们想要的
//
////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include <iostream>
#include <winsock2.h>
#include <string>

#pragma comment(lib,"ws2_32.lib")
using namespace std;
/**
 *	解析URL
 *	@param strUrl 待解析的域名
 * @param strHost OUT
 * @param strResource OUT
 * @return false 解析失败
 */
BOOL ParseUrl(const string strUrl, string &strHost, string &strResource)
{
	BOOL bRet = FALSE;
	const int MAXRESOURCESIZE = 2000;
	const int MINHOSTSIZE = 5;
	do 
	{
		string strHttp = "http://";
		// 从strUrl中找到"http://"
		const char * szPos = strstr(strUrl.c_str(), strHttp.c_str());
		// 如果没有找到首"http://",说明没有http
		if (NULL == szPos)
		{
			szPos = strUrl.c_str();
		}
		else
		{
			szPos = szPos + strHttp.length();
		}
		char szHost[MAXBYTE] = {0};
		char szResource[MAXRESOURCESIZE] = {0};		// 标准写法:长度2000(MAXRESOURCESIZE = 2000)
		sscanf_s(szPos, "%[^/]%s",szHost,MAXBYTE, szResource, MAXBYTE);
		if (MINHOSTSIZE > strlen(szHost))
		{
			break;
		}
		strHost = szHost;
		// 如果不等于0,说明szResource不为空
		if (0 != strlen(szResource))
		{
			strResource = szResource;
		}
		else
		{
			strResource = "/";
		}

		bRet = TRUE;
	} while (FALSE);

	return bRet;
}

int _tmain(int argc, _TCHAR* argv[])
{
	BOOL bRet = FALSE;
	SOCKET socketServer = INVALID_SOCKET;	
	do 
	{
		WSADATA wsaData;
		// 初始化socket
		if (0 != WSAStartup(MAKEWORD(2, 2), &wsaData))
		{
			break;
		}
		if (2 != LOBYTE(wsaData.wVersion) || 2 != HIBYTE(wsaData.wVersion))
		{
			break;
		}
		// 服务端: 通过编程, 将域名转换成IP
		string strUrl = "www.wmpic.me/meinv";
		string strHost, strResouce;
		ParseUrl(strUrl, strHost, strResouce);
		printf("Host:%s \t Rosouce:%s \r\n", strHost.c_str(), strResouce.c_str());
		// 获取主机
		HOSTENT * hServerHost = gethostbyname(strHost.c_str());
		if (NULL == hServerHost)
		{
			WSACleanup();
			break;
		}
		sockaddr_in addrServer = {0};
		addrServer.sin_family = AF_INET;
		addrServer.sin_port = htons(80);		// 80端口
		memcpy(&(addrServer.sin_addr), hServerHost->h_addr, 4);
		// 创建socket
		socketServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (INVALID_SOCKET == socketServer)
		{
			closesocket(socketServer);
			WSACleanup();
			break;
		}
		// 连接socket
		if (SOCKET_ERROR == connect(socketServer, (SOCKADDR*)&addrServer, sizeof(addrServer)))
		{
			closesocket(socketServer);
			WSACleanup();
			break;
		}
		// 发送Get请求: "GET "后面有一个空格, " HTTP/1.1" HTTP前面有个空格
		// 右值为截取封包获取的
		string strRequest = "GET " + strResouce + " HTTP/1.1\r\nHost:" + strHost + "\r\nConnection:Close\r\n\r\n" ;	
		if (SOCKET_ERROR == send(socketServer, strRequest.c_str(), strRequest.length(), 0))
		{
			closesocket(socketServer);
			WSACleanup();
			break;
		}
		char szBuffer[2000] = {0};
		// 返回的数据不可能一次性接收完毕,所以必须要用循环读取,直到recv返回0,接收完毕!
		int iRecvSize = 1;
		while (0<iRecvSize)
		{
			iRecvSize = recv(socketServer, szBuffer, 2000, 0);
			cout<<"szBuffer = "<<szBuffer<<endl;
		}
		// 清理socket
		if (INVALID_SOCKET != socketServer)
		{
			closesocket(socketServer);
			WSACleanup();
		}
	} while (FALSE);




	getchar();
	return 0;
}