直接上函数代码：
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#include <afxwin.h> // MFC 核心组件和标准组件
#include <Wininet.h>
#include <iostream>
#include <string>
using
namespace
std;
//walker 2013.05
//hostname主机名，例如www.baidu.com
//suburl，例如asp/test.asp?num=3
//port，端口号
string GetHttpFile(
const
char
hostname[],
const
char
suburl[], unsigned
short
port)
{
HINTERNET hInternet = NULL,
hConnect = NULL,
hRequest = NULL;
BOOL
bRtn;
string strResponse;
hInternet = InternetOpen(
"User-Agent"
,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL, 0 );
if
(NULL == hInternet)
{
cout <<
"InternetOpen Failed!"
<< endl;
goto
exception_over;
}
hConnect = InternetConnect(hInternet, hostname, port, NULL,
" HTTP/1.1 "
,INTERNET_SERVICE_HTTP, 0 , 0 );
if
(NULL == hConnect)
{
cout <<
"InternetConnect Failed!"
<< endl;
goto
exception_over;
}
hRequest = HttpOpenRequest(hConnect,
"GET"
, suburl,
" HTTP/1.1 "
,NULL,NULL,INTERNET_FLAG_RELOAD, 0 );
if
(NULL == hRequest)
{
cout <<
"HttpOpenRequest Failed!"
<< endl;
goto
exception_over;
}
//三种超时值
DWORD
TimeOuts[] = {5*1000, 5*1000, 10*1000};
InternetSetOption(hRequest,INTERNET_OPTION_CONNECT_TIMEOUT , &(TimeOuts[0]),
sizeof
(
DWORD
));
InternetSetOption(hRequest,INTERNET_OPTION_SEND_TIMEOUT , &(TimeOuts[1]),
sizeof
(
DWORD
));
InternetSetOption(hRequest,INTERNET_OPTION_RECEIVE_TIMEOUT, &(TimeOuts[2]),
sizeof
(
DWORD
));
bRtn = HttpSendRequest(hRequest,NULL, 0 , NULL, 0);
if
(!bRtn)
{
cout <<
"HttpSendRequest Failed!"
<< endl;
goto
exception_over;
}
char
buf[1000] = {0};
DWORD
dwLengthBufQuery =
sizeof
(buf);
bRtn = HttpQueryInfo(hRequest, HTTP_QUERY_CONTENT_LENGTH, buf, &dwLengthBufQuery, NULL);
if
(!bRtn)
{
cout <<
"HttpQueryInfo Failed!"
<< endl;
goto
exception_over;
}
int
file_len =
atoi
(buf);
cout <<
"filelen: "
<< file_len <<
"bytes"
<< endl;
int
i = 1;
const
int
BUF_LEN = 256;
char
cReadBuffer[BUF_LEN] = {0};
unsigned
long
sum_recv = 0;
unsigned
long
read_len;
while
(TRUE)
{
memset
(cReadBuffer, 0 , BUF_LEN);
unsigned
long
lNumberOfBytesRead;
read_len = (file_len - sum_recv) > (BUF_LEN - 1) ? (BUF_LEN - 1) : (file_len - sum_recv);
bRtn = InternetReadFile(hRequest, cReadBuffer, read_len , &lNumberOfBytesRead);
//注意：这里认为文件中不会有'\0'
strResponse = strResponse + cReadBuffer;
cout <<
"第"
<< i <<
"次: "
<< lNumberOfBytesRead <<
"bytes"
<< endl;
if
( !bRtn || strResponse.size() >= (unsigned
int
)file_len)
{
break
;
}
++i;
}
exception_over:
if
(NULL != hRequest)
{
InternetCloseHandle(hRequest);
}
if
(NULL != hConnect)
{
InternetCloseHandle(hConnect);
}
if
(NULL != hInternet)
{
InternetCloseHandle(hInternet);
}
return
strResponse;
}
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***
本文转自walker snapshot博客51CTO博客，原文链接http://blog.51cto.com/walkerqt/1206538如需转载请自行联系原作者
RQSLT
