Http1.1中 使用 chunked 编码传送时 没有CONTENT_LENGTH,下载之前无法确定要下载的大小.
Wininet中已经内嵌该传输协议,要查看chunked块的大小只能socket底层编写获取报文.
Wininet能不能直接访问原报文需走旁路.

// socket_http.cpp : Defines the entry point for the console application.

//
#include "stdafx.h"

#include

#include
#pragma warning(disable:4996)

#pragma warning(disable:4267)

#pragma comment(lib, "WS2_32.lib")
void logFile(char *p,int len);

char fname[100];
int main()

{

	WORD wVersionRequested;

	WSADATA wsaData;

	int bytesRecv;
//Initialize Winsock

	wVersionRequested = MAKEWORD(2,2);

	bytesRecv = WSAStartup(wVersionRequested,&wsaData);
if(bytesRecv != 0)

	{

		printf("WSAStartup failed: %d\n", bytesRecv);

		return 1;
}
if(LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)

	{

		WSACleanup();

		return 1;

	}

	strcpy(fname,"index.html");

	_unlink(fname);
char host[] = {"www.baidu.com"};

	hostent * ht = gethostbyname(host);

	struct in_addr ip_addr;

	memcpy(&ip_addr,ht->h_addr_list[0],4);
SOCKET sockClient = socket(AF_INET,SOCK_STREAM,0);

	SOCKADDR_IN addrSrv;

	addrSrv.sin_addr = ip_addr;

	addrSrv.sin_family = AF_INET;

	addrSrv.sin_port = htons(80);
char ip[20];

	sprintf(ip,"%d.%d.%d.%d",

		addrSrv.sin_addr.S_un.S_un_b.s_b1,

		addrSrv.sin_addr.S_un.S_un_b.s_b2,

		addrSrv.sin_addr.S_un.S_un_b.s_b3,

		addrSrv.sin_addr.S_un.S_un_b.s_b4);

	printf("host:%s ip:%s\r\n",host,ip);
bytesRecv = connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

	if( bytesRecv == SOCKET_ERROR)

	{

		WSACleanup();

		return 1;

	}
char recvBuf[1024];

	char* protocolHead= "GET / HTTP/1.1\n"

			"Host:www.baidu.com\n"

			"Accept:*/*\n"

			"User-Agent:Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)\n"

			"Connection:close\n\n";
bytesRecv = send(sockClient,protocolHead,strlen(protocolHead)+1,0);

	printf("request headers:\r\n%s\r\n",protocolHead);

	int ic=0;

	while( bytesRecv != SOCKET_ERROR )

	{

		memset(recvBuf,0,1024);

		bytesRecv = recv(sockClient,recvBuf,1024,0);

		if(ic==0)

			printf("response headers[%ld]:\r\n%s\r\n",bytesRecv,recvBuf);

		if(ic==1)

			printf("body [%ld]:\r\n%s",bytesRecv,recvBuf);

		ic++;

		if ( bytesRecv == 0 || bytesRecv == WSAECONNRESET ) {

			printf( "Connection Closed.\n");

			break;

		}

		logFile(recvBuf,bytesRecv);

	}

	closesocket(sockClient);

	WSACleanup();
return 0;

}
void logFile(char *p,int len)

{

	FILE *fp = fopen(fname,"a+");

	if(!fp) return;

	fwrite(p,1,len,fp);

	fclose(fp);

}
----------------------------------------------------------------------

运行结果

host:www.baidu.com ip:119.75.218.77
request headers:

GET / HTTP/1.1

Host:www.baidu.com

Accept:*/*

User-Agent:Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)

Connection:close
response headers[633]:

HTTP/1.1 200 OK

Date: Sun, 13 Apr 2014 18:24:51 GMT

Content-Type: text/html; charset=utf-8

Transfer-Encoding: chunked

Connection: Close

Vary: Accept-Encoding

Set-Cookie: BAIDUID=10AA88D7B6D34E65F9FF8A384BE63FE9:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com

Set-Cookie: BDSVRTM=0; path=/

Set-Cookie: H_PS_PSSID=5778_5991_1421_5225_5848_4760_6017_5856_5918; path=/; domain=.baidu.com

P3P: CP=" OTI DSP COR IVA OUR IND COM "

Cache-Control: private

Expires: Sun, 13 Apr 2014 18:24:20 GMT

X-Powered-By: HPHP

Server: BWS/1.1

BDPAGETYPE: 1

BDQID: 0x875baba2004f0570

BDUSERID: 0
body [1024]:

d27b