HTTP upload using WinInet - http

Question

I'm doing http(PUT) upload using WinInet library, on WinXP its working fine but on Win7 its not working and the strange thing is 'InterWriteFile' function of WinInet files is returning true. Any help will be appreciated.
Thanks in Advance.
//this is the first function that is called when upload is requested.
void Upload()
{
//check if handle is already open or not
if(!m_hNetOpen)
{
//open interconnect: Initializes an application's use of the WinINet functions.
m_hNetOpen = InternetOpen("XYZ",
INTERNET_OPEN_TYPE_DIRECT,
NULL,
NULL,
INTERNET_INVALID_PORT_NUMBER);
//return if handle is NULL
if(m_hNetOpen == NULL)
{
return FALSE;
}
}
//we'll get user specified URL, could be some xyz.com too.
if(!m_hNetConnect)
{
//opens HTTP or FTP connection for a site requested...pchServerName requested
m_hNetConnect = InternetConnect(m_hNetOpen,
strServerName,
INTERNET_DEFAULT_HTTP_PORT,
NULL,
NULL,
INTERNET_SERVICE_HTTP,
INTERNET_FLAG_PASSIVE,
dwContext);
//return if handle is NULL
if(m_hNetConnect == NULL)
{
return FALSE;
}
}
dwContext = 0;
//now, create HTTP request
m_hHttpConnect = HttpOpenRequest(m_hNetConnect,
"PUT",
strObjectName,
NULL,
NULL,
NULL,
INTERNET_FLAG_CACHE_IF_NET_FAIL,
dwContext);
//return if handle is NULL
if(m_hHttpConnect == NULL)
{
return FALSE;
}
//call UseHttpSendReqEx
BOOL bRet = UseHttpSendReqEx(m_hHttpConnect, strUploadFileName);
//if not suuceeded log the message
if(!bRet)
{
//Logmessage
}
if(m_hHttpConnect)
{
//close the handle
InternetCloseHandle(m_hHttpConnect);
}
return bRet;
}
//this function is will send HTTP request and writes data to internetfile
BOOL UseHttpSendReqEx(HINTERNET hConnect, char *upFile)
{
INTERNET_BUFFERS BufferIn = {0};
DWORD dwBytesRead = 0;
DWORD dwBytesWritten = 0;
//buffer
BYTE strBuffer[20480] = {0};
BOOL bRead;
BOOL bRet = TRUE;
//get the size of structure
BufferIn.dwStructSize = sizeof(INTERNET_BUFFERS);
//create file
m_hFile = CreateFile(upFile, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_DELETE,
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
//check for invalid handle
if (m_hFile == INVALID_HANDLE_VALUE)
{
return FALSE;
}
//get the file size
BufferIn.dwBufferTotal = GetFileSize(m_hFile, NULL);
//send request to HTTP server
if(!HttpSendRequestEx(hConnect, &BufferIn, NULL, HSR_INITIATE, 0))
{
//close the file handle
CloseHandle(m_hFile);
m_hFile = NULL;
return FALSE;
}
DWORD sum = 0;
do
{
//read the file that is to be uploaded
if (!(bRead = ReadFile(m_hFile, strBuffer, sizeof(strBuffer),
&dwBytesRead, NULL)))
{
bRet = FALSE;
break;
}
//write the internet file
bRet=InternetWriteFile(hConnect, strBuffer, dwBytesRead,
&dwBytesWritten);
if(!bRet)
{
DWORD d = GetLastError();
bRet = FALSE;
break;
}
memset(strBuffer, '\0', sizeof(strBuffer));
sum += dwBytesWritten;
}
while(dwBytesRead == sizeof(strBuffer)) ;
//This sleep was introduced as if we immediately after the above loop
//if we try to close the handle then file does not get created on the server
Sleep(100);
BOOL b = CloseHandle(m_hFile);
m_hFile = NULL;
return bRet;
}