Re: Huge File read and send via socket

From:

"Volodymyr Shcherbyna" <v_scherbina@online.mvps.org>

Newsgroups:

microsoft.public.cn.vc++,microsoft.public.usasalesinfo.developer.visualc++,microsoft.public.vc.language,microsoft.public.vc.stl

Date:

Tue, 29 Jan 2008 10:35:44 +0100

Message-ID:

<e0IddplYIHA.2268@TK2MSFTNGP02.phx.gbl>

There is not need to read the whole file into memory. Reading/sending can be
done chunk by chunk, something like

while (sizeoffile)
{
readchunk (nchunksize);
sendchunk (nchunksize);
sizeoffile -= nchunksize;
}

--
V
This posting is provided "AS IS" with no warranties, and confers no
rights.
"Alexander Nickolov" <agnickolov@mvps.org> wrote in message
news:OlJ4T%23eYIHA.4272@TK2MSFTNGP05.phx.gbl...

Nor can you actually load a 2GB file into a 32-bit process'
address space...

--
=====================================
Alexander Nickolov
Microsoft MVP [VC], MCSD
email: agnickolov@mvps.org
MVP VC FAQ: http://vcfaq.mvps.org
=====================================

"batch" <chinaonhb@hotmail.com> wrote in message
news:%23M2tvKyXIHA.4140@TK2MSFTNGP04.phx.gbl...

??????????????????????????????????????????????????????????????cn????????????????????????????????????????????????????????????????????????????

"Ganesh" <gvijayaratnam@gmail.com> ????????
news:%23KfMenYXIHA.4448@TK2MSFTNGP03.phx.gbl...
Hi all,

I am new to c++ and socket programming, I have a situvation that my
function have to a binary read ( whole file as 1 chunk ) and keep the
buffer, and send the buffrer via socket by chunk by chunk as user
specified. I have written a code sample, but I am not getting the correct
out out.

can some one pls look in to the code and fix it ?

FILE *fp23 = fopen( "c:\\hpfile.prn", "rb" );

fseek (fp23 , 0 , SEEK_END);
int m_jobSize = ftell (fp23);
rewind (fp23);

char* m_buffer = new char[m_jobSize+1];

int m_result = fread( m_buffer, 1, m_jobSize, fp23 );

///////////////////////////////////////////////

int BytesIndex = 0;

while( bufsize > 0)
{

// Send some bytes
if ( bufsize < (unsigned long)iSendStatus )
{
  iSendStatus = send(*sock, &m_buffer[BytesIndex], bufsize, 0); // Socket
is of type

  //
  // Call Back Function
  //
  set += iSendStatus;
  ptr(jobid,set);

  if ( iSendStatus != bufsize )
  {
   cpError = SocketErrorHandler();
   return cpError;
  }

}
else
{
  iSendStatus = send(*sock, &m_buffer[BytesIndex], chunkSize, 0); //
Socket is of type

  //
  // Call Back Function
  //
  set += iSendStatus;
  ptr(jobid,set);

  if ( iSendStatus != chunkSize )
  {
   cpError = SocketErrorHandler();
   return cpError;
  }

}

// Update buffer and counter
if ( bufsize < (unsigned long)iSendStatus )
{
  bufsize -= bufsize;
  BytesIndex += bufsize;
}
else
{
  bufsize -= iSendStatus;
  BytesIndex +=iSendStatus;
}

//////////////////////////////

regards
Ganesh