Hi Vikas,
Attaching code snippet for WinHTTP. Similar to WinInet , I got code for
WinInet Also , They are almost the same. This is a code for checking if
download by part is supported. Additional HTTP header is added. Major
Portion of code is from MSDN. Replace StringTokenizer with Unicode Text
L"Text".
// HTTPManager.cpp: implementation of the HTTPManager class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "HTTPManager.h"
#include "StringTokenizer.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
HTTPManager::HTTPManager()
{
}
HTTPManager::~HTTPManager()
{
}
bool HTTPManager::HTTPGetFileInfo(LPTSTR URL)
{
// ANSI TO Unicdoe
DWORD dwSize = 0;
LPVOID lpOutBuffer = NULL;
BOOL bResults = FALSE;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
DWORD dwDownloaded = 0;
LPSTR pszOutBuffer;
StringTokenizer* URLStringTokenizer = new StringTokenizer();
URLStringTokenizer->SetStringToken(URL,"/");
printf("%s",URLStringTokenizer->NextToken());
char szTemp[100] = "000000000000000000000000000000000000000000";
strcpy(szTemp ,URLStringTokenizer->NextToken("/"));
WCHAR wszTemp[100+1]; // Unicode ServerName
MultiByteToWideChar( CP_ACP, 0, szTemp ,
strlen(szTemp )+1, wszTemp,
100);
printf("\n%s",szTemp);
// Use WinHttpOpen to obtain a session handle.
hSession = WinHttpOpen( L"DA 7.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0 );
// Specify an HTTP server.
if( hSession )
hConnect = WinHttpConnect( hSession,wszTemp,
INTERNET_DEFAULT_PORT, 0 );
strcpy(szTemp ,URLStringTokenizer->NextToken(" "));
if(szTemp[strlen(szTemp)-2] == '\r')
szTemp[strlen(szTemp)-2] = '\0';
printf("\n%s",szTemp);
MultiByteToWideChar( CP_ACP, 0, szTemp ,
strlen(szTemp )+1, wszTemp,
100);
// Create an HTTP request handle.
if( hConnect )
hRequest = WinHttpOpenRequest( hConnect, L"GET", wszTemp,
NULL, WINHTTP_NO_REFERER,
0,
0);
// Add a request header.
if( hRequest )
bResults = WinHttpAddRequestHeaders( hRequest,
L"Range: bytes=0-",
-1,
WINHTTP_ADDREQ_FLAG_ADD );
// Send a request.
if( hRequest )
bResults = WinHttpSendRequest( hRequest,
WINHTTP_NO_ADDITIONAL_HEADERS, 0,
WINHTTP_NO_REQUEST_DATA, 0,
0, 0 );
// End the request.
if( bResults )
bResults = WinHttpReceiveResponse( hRequest, NULL );
/* New Added */
// First, use HttpQueryInfo to obtain the size of the buffer.
if (bResults)
{
WinHttpQueryHeaders( hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF,
WINHTTP_HEADER_NAME_BY_INDEX, NULL, &dwSize,
WINHTTP_NO_HEADER_INDEX);
// Allocate memory for the buffer.
if( GetLastError( ) == ERROR_INSUFFICIENT_BUFFER )
{
lpOutBuffer = new WCHAR[dwSize/sizeof(WCHAR)];
// Now, use HttpQueryInfo to retrieve the header.
bResults = WinHttpQueryHeaders( hRequest,
WINHTTP_QUERY_RAW_HEADERS_CRLF,
WINHTTP_HEADER_NAME_BY_INDEX,
lpOutBuffer, &dwSize,
WINHTTP_NO_HEADER_INDEX);
}
}
// Print the header contents.
if (bResults)
printf("Header contents: \n%S",lpOutBuffer);
/*End New Added - Delete Comment Final */
// Keep checking for data until there is nothing left.
if( bResults )
{
do
{
// Check for available data.
dwSize = 0;
if( !WinHttpQueryDataAvailable( hRequest, &dwSize ) )
printf( "Error %u in WinHttpQueryDataAvailable.\n",
GetLastError( ) );
printf("\n Number Of Bytes - %d \n",dwSize);
// Allocate space for the buffer.
pszOutBuffer = new char[dwSize+1];
if( !pszOutBuffer )
{
printf( "Out of memory\n" );
dwSize=0;
}
else
{
// Read the data.
ZeroMemory( pszOutBuffer, dwSize+1 );
if( !WinHttpReadData( hRequest, (LPVOID)pszOutBuffer,
dwSize, &dwDownloaded ) )
printf( "Error %u in WinHttpReadData.\n", GetLastError( ) );
else
printf( "%s", pszOutBuffer );
// Free the memory allocated to the buffer.
delete [] pszOutBuffer;
}
} while( dwSize > 0 );
}
// Report any errors.
if( !bResults )
printf( "Error %d has occurred.\n", GetLastError( ) );
// Close any open handles.
if( hRequest ) WinHttpCloseHandle( hRequest );
if( hConnect ) WinHttpCloseHandle( hConnect );
if( hSession ) WinHttpCloseHandle( hSession );
return false;
}
Hope this helps. If Needed I will write a sample projegram and send it to u.
I will post the StringTokenizer class in my web site on Apr 18 Monday (Need
to add few lines to comments :) ).
Thanks!
Murugan
www.muruganad.net
"Nothing is Impossible, Its just Improbable"
Post by Rob GraingerVikas,
Try
http://msdn.microsoft.com/library/en-us/wininet/wininet/retrieving_http_headers.asp?frame=true
(thats one URL split over two lines (in my browser anyway), but it should
answer your question.
Rob
Post by msHi,
Im using HTTP functions and want to know how to parse the headers returned
by ther server so i can get the value of Content-Length. I can't find the
way since, the functions seems only to support data returned but not the
response headers.
Please help,
Vikas