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Concatenating  files programmatically

Posted on 1997-10-09
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Last Modified: 2010-04-04
I want to append or concatenate together some files programmatically. Is there a way I can call the DOS 'COPY' command from Delphi, so I can issue the command 'COPY file1.txt+file2.txt+file3.txt result.txt? Or is there some Delphi command that will do it for me?

Thanks,
   Shawn Halfpenny

P.S: new e-mail address : drumme59@sprint.ca
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Question by:aztec
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andrewjb earned 50 total points
ID: 1347132
procedure TForm1.Button1Click(Sender: TObject);
var
  lOut : tFileStream;
  lIn  : tFileStream;
begin
  lOut := tFileStream.Create( 'c:\temp\out' , fmCreate );

  lIn  := tFileStream.Create( 'c:\temp\in.1' , fmOpenRead );
  lOut.CopyFrom( lIn , lIn.Size );
  lIn.Free;

  lIn := tFileStream.Create( 'c:\temp\in.2' , fmOpenRead );
  lOut.CopyFrom( lIn , lIn.Size );
  lIn.Free;

  { etc.! }

  lOut.Free;
end;
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by:mirek071497
ID: 1347133
Or just trap exceptions from the filestream objects ....

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by:andrewjb
ID: 1347134
Yes, but if you need progress bar then what ?
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by:mirek071497
ID: 1347135
Then copy not all in one step, but this is the same as BlockRead. This is only other idea.
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by:mirek071497
ID: 1347136
adrewjb - Sorry for my next comment, but what about sharing ? I don;t know if it is possible with stream. Do you know about this.
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by:mirek071497
ID: 1347137
The second parameter of the Create call can lock the file, I think.

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by:andrewjb
ID: 1347138
Yes You have right. The direct file functions is better only when more than one user often updates the file. Better means so You can write program easly. Stupid example can be file for conversation within some users (I say so this is stupid !).
Thank you. I just will be using whenever it is possible FileStream.
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by:mirek071497
ID: 1347139
function ConcatFiles(inFilename1,inFilename2,outFilename : string) : boolean;
const BUFFERSIZE                = $FFFF;
var   inFile1, inFile2, outFile : file;
      buffer                    : pointer;
      readbytes                 : integer;
begin
  {$I-}

  {Open all the files}
  AssignFile(inFile1,inFilename1); Reset(inFile1,1);
  if IOResult <> 0 then begin ConcatFiles := false; exit end;
  AssignFile(inFile2,inFilename2); Reset(inFile2,1);
  if IOResult <> 0 then begin ConcatFiles := false; exit end;
  AssignFile(outFile,outFilename); ReWrite(outFile,1);
  if IOResult <> 0 then begin ConcatFiles := false; exit end;

  {allocate memory for the buffer}
  getMem(buffer,BUFFERSIZE);

  {copy file 1}
  while not EOF(inFile1) do begin
    BlockRead(inFile1,buffer^,BUFFERSIZE,readbytes);
    BlockWrite(outFile,buffer^,readbytes);
  end;

  {copy file 2}
  while not EOF(inFile2) do begin
    BlockRead(inFile2,buffer^,BUFFERSIZE,readbytes);
    BlockWrite(outFile,buffer^,readbytes);
  end;

  {free the buffer memory}
  freeMem(buffer,BUFFERSIZE);

  {close all the files}
  CloseFile(inFile1); CloseFile(inFile2); CloseFile(outFile);

  {$I+}
  ConcatFiles := true;
end;


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Expert Comment

by:mes
ID: 1347140
hi mes ! This differs from my comment only in buffer. Your buffer is better of course, but answer from adrewjb is the best.
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by:mirek071497
ID: 1347141
Hi, I'd like to re-submit my grade for AndrewJB's answer to this. He really did give an excellent answer - it works beautifully - so I'd like to give him an A.

Cheers
   Shawn Halfpenny
    drumme59@sprint.ca
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