Datei kopieren mit Fortschrittsanzeige

[Matze]

Hi!

Manzoni war so nett und hat mir einen Link geschickt, auf dem steht, wie man den Fortschritt beim Kopieren einer Datei anzeigen lassen kann:

Delphi-Quellcode:

type 
  TCallBack = procedure(Position, Size: Longint); { export; } 

procedure FastFileCopy(const InFileName, OutFileName: string; 
  CallBack: TCallBack); 


implementation 

procedure FastFileCopyCallBack(Position, Size: Longint); 
begin 
  Form1.ProgressBar1.Max := Size; 
  Form1.ProgressBar1.Position := Position; 
end; 

procedure FastFileCopy(const InFileName, OutFileName: string; 
  CallBack: TCallBack); 
const 
  BufSize = 3 * 4 * 4096; { 48Kbytes gives me the best results } 
type 
  PBuffer = ^TBuffer; 
  TBuffer = array[1..BufSize] of Byte; 
var 
  Size: DWORD; 
  Buffer: PBuffer; 
  infile, outfile: file; 
  SizeDone, SizeFile: LongInt; 
begin 
  if (InFileName <> OutFileName) then 
  begin 
    buffer := nil; 
    Assign(infile, InFileName); 
    Reset(infile, 1); 
    try 
      SizeFile := FileSize(infile); 
      Assign(outfile, OutFileName); 
      Rewrite(outfile, 1); 
      try 
        SizeDone := 0; 
        New(Buffer); 
        repeat 
          BlockRead(infile, Buffer^, BufSize, Size); 
          Inc(SizeDone, Size); 
          CallBack(SizeDone, SizeFile); 
          BlockWrite(outfile, Buffer^, Size) 
        until Size < BufSize; 
        FileSetDate(TFileRec(outfile).Handle, 
        FileGetDate(TFileRec(infile).Handle)); 
      finally 
        if Buffer <> nil then 
          Dispose(Buffer); 
        CloseFile(outfile) 
      end; 
    finally 
      CloseFile(infile); 
    end; 
  end 
  else 
    raise EInOutError.Create('File cannot be copied onto itself') 
end; {FastFileCopy} 

procedure TForm1.Button1Click(Sender: TObject); 
begin 
  FastFileCopy('c:\daten.txt', 'c:\test\daten2.txt', @FastFileCopyCallBack);  //<== Fehler
end;

Es kommt aber leider immer, dass eine Variable verlangt wird, anstatt @FastFileCopyCallBack.