Re: Huge File read and send via socket

From:

"Alexander Nickolov" <agnickolov@mvps.org>

Newsgroups:

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

Date:

Wed, 23 Jan 2008 14:38:05 -0800

Message-ID:

<u35ioBhXIHA.4440@TK2MSFTNGP06.phx.gbl>

The correct groups would be:

microsoft.public.vc.language
microsoft.public.win32.programmer.networks

The former for language/platform issues (like the fact you are trying
to map the entire file into the process virtual space, which cannot
work for huge files you are interested in on a 32-bit platform) and
the latter in case there are issues with your networking code. BTW,
you didn't specify what your problem is in the first place...

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

"Ganesh" <gvijayaratnam@gmail.com> wrote in message
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