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Send/Receive file with TClient/TServerSocket

Posted on 1998-09-12
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Last Modified: 2010-04-03
Hi, I would Like to know how to Send and receive files
with a TClientSocket and a TServerSocket?
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Question by:mabell
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TimYates earned 50 total points
ID: 1339558
Try this:

Assuming :

   client : tClientSocket ;

(and you have opened the socket...)

procedure SendFile( filename : string ) ;
var
  f : FILE ;
  p : ^byte ;
  sz, osz, rsz : longint ;
begin
  AssignFile( f, filename );
  {$i-}Reset( f, 1 ){$i+}
  osz := FileSize( f ) ;
  p := allocMem( sizeof( byte ) * osz ) ;
  sz := osz ;
  rsz := BlockRead( f, p^, sz ) ;
  client.Socket.SendBuf( p^, rsz ) ;
  while( rsz < sz ) do
  begin
    sz := sz - rsz ;
    rsz := BlockRead( f, p^, sz ) ;
    client.Socket.SendBuf( p^, rsz ) ;
  end ;
  FreeMem( p, sizeof( byte ) * osz ) ;
  CloseFile( f ) ;
end ;


and in the OnClientRead event of the server socket:

procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
var
  f : file ;
  p : ^byte ;
  rsz, sz : longint ;
begin
  AssignFile( f, 'FileFromSocket' + Inttostr( Socket.Handle ) ) ;
  {$i-}Reset( f, 1 ) ;{$i+}
  sz := socket.ReceiveLength ;
  p := allocmem( sizeof( byte ) * sz ) ;
  rsz := Socket.RecieveBuf( p^, sz ) ;
  ReallocMem( p, sizeof( byte ) * rsz ) ;
  BlockWrite( f, p^, rsz ) ;
  CloseFile( f ) ;
  Freemem( p, sizeof( byte ) * rsz );
end;

If you want to send the filename as well (which I guess that you do), then just add a 256byte buffer onto the start of your pointer to byte, so that this can store the buffered filename...this will allow you 256 character filenames, but you will just have to write the code to memcopy the first 256 bytes out of the incoming buffer, convert it to a string, trim it, and use it as the filename...

Should do it...

Good luck...

Tim.

PS:  Ask again if this doesnt work, and I will write that bit for you too (for a few more crdits ;) heh heh heh ) -- or just mail me... ;O)


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