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
", 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
",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
"
"Host:www.baidu.com
"
"Accept:*/*
"
"User-Agent:Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)
"
"Connection:close
";
bytesRecv = send(sockClient,protocolHead,strlen(protocolHead)+1,0);
printf("request headers:
%s
",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]:
%s
",bytesRecv,recvBuf);
if(ic==1)
printf("body [%ld]:
%s",bytesRecv,recvBuf);
ic++;
if ( bytesRecv == 0 || bytesRecv == WSAECONNRESET ) {
printf( "Connection Closed.
");
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 <--- chunked 大小
^^^^
以下是html正文
Connection Closed.