Re: Huge File read and send via socket

From:

"jim" <guangcai.zhang@voicecyber.com>

Newsgroups:

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

Date:

Fri, 25 Jan 2008 10:34:39 +0800

Message-ID:

<uXogfrvXIHA.5132@TK2MSFTNGP02.phx.gbl>

This is a multi-part message in MIME format.

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I don't know what you mean, but fopen and such function you used can not =
arrange bigsize file over 2G, so you will use another function just like =
CreateFile to deal with those file over 2G!
  "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

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; =
charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16587" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>I don't know what you mean, but <FONT
face="Courier New">fopen and such function you used can not arrange =
bigsize file
over 2G, so you will use another function just like CreateFile to deal =
with
those file over 2G!</FONT></FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV>"Ganesh" <<A
  =
href="mailto:gvijayaratnam@gmail.com">gvijayaratnam@gmail.com</A>> =
wrote in
  message <A
  =
href="news:%23KfMenYXIHA.4448@TK2MSFTNGP03.phx.gbl">news:%23KfMenYXIHA.=
4448@TK2MSFTNGP03.phx.gbl</A>...</DIV>
  <DIV><FONT face=Arial size=2>Hi all,</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>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.</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face=Arial size=2>can some one pls look in to the code =
and fix it
  ?</FONT></DIV>
  <DIV><FONT face=Arial size=2></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2>FILE *fp23 = fopen( =
"c:\\hpfile.prn",
  "rb" );</FONT></DIV>
  <DIV><FONT face="Courier New" size=2></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2>fseek (fp23 , 0 , =
SEEK_END);<BR>int
  m_jobSize = ftell (fp23);<BR>rewind (fp23);</FONT></DIV>
  <DIV><FONT face="Courier New" size=2></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2>char* m_buffer = new
  char[m_jobSize+1];</FONT></DIV>
  <DIV><FONT face="Courier New" size=2></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2>int m_result = fread( =
m_buffer, 1,
  m_jobSize, fp23 );</FONT></DIV>
  <DIV><FONT face="Courier New" size=2></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2></FONT> </DIV>
  <DIV><FONT face="Courier New"
  size=2>///////////////////////////////////////////////</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2> int BytesIndex = 0; =
</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2> while( bufsize >
  0)<BR> {</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2>  // Send some
  bytes<BR>  if ( bufsize < (unsigned long)iSendStatus
  )<BR>  {<BR>   iSendStatus = send(*sock,
  &m_buffer[BytesIndex], bufsize, 0); // Socket is of
  =
type<BR>   <BR>   //<BR>   /=
/
  Call Back Function<BR>   //<BR>   set =
+=
  =
iSendStatus;<BR>   ptr(jobid,set);<BR>   </=
FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New" size=2>   if ( =
iSendStatus !=
  bufsize )<BR>   {<BR>    cpError =
=
  SocketErrorHandler();<BR>    return
  cpError;<BR>   }</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New"
  =
size=2>  }<BR>  else<BR>  {<BR> &nbs=
p; iSendStatus
  = send(*sock, &m_buffer[BytesIndex], chunkSize, 0); // Socket is =
of
  type</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New"
  size=2>   //<BR>   // Call Back
  Function<BR>   //<BR>   set +=
  iSendStatus;<BR>   ptr(jobid,set);</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV><FONT size=2>
  <DIV><BR><FONT face="Courier New">   if ( iSendStatus =
!=
  chunkSize )<BR>   {<BR>    cpError =
=
  SocketErrorHandler();<BR>    return
  =
cpError;<BR>   }<BR> <BR>  }</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><FONT face="Courier New">  // Update buffer and
  counter<BR>  if ( bufsize < (unsigned long)iSendStatus
  )<BR>  {<BR>   bufsize -=
  bufsize;<BR>   BytesIndex +=
  =
bufsize;<BR>  }<BR>  else<BR>  {<BR> &=
nbsp; bufsize
  -= iSendStatus; <BR>   BytesIndex +=iSendStatus;
  <BR>  }</FONT></DIV>
  <DIV><FONT face="Courier New"></FONT> </DIV>
  <DIV><BR><FONT
  face="Courier =
New">//////////////////////////////<BR></FONT></FONT></DIV>
  <DIV><FONT face=Arial size=2>regards</FONT></DIV>
  <DIV><FONT face=Arial size=2>Ganesh</FONT></DIV>
  <DIV><FONT face=Arial =
size=2></FONT> </DIV></BLOCKQUOTE></BODY></HTML>

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