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How to copy a file using a progressbar

Title: How to copy a file using a progressbar 1. You need a TProgressBar on your form for this tip. procedure TForm1.CopyFileWithProgressBar1(Source, Destination: string); var FromF, ToF: file of byte; Buffer: array[0..4096] of char; NumRead: integer; FileLength: longint; begin AssignFile(FromF, Source); reset(FromF); AssignFile(ToF, Destination); rewrite(ToF); FileLength := FileSize(FromF); with Progressbar1 do begin Min := 0; Max := FileLength; while FileLength 0 do begin BlockRead(FromF, Buffer[0], SizeOf(Buffer), NumRead); FileLength := FileLength - NumRead; BlockWrite(ToF, Buffer[0], NumRead); Position := Position + NumRead; end; CloseFile(FromF); CloseFile(ToF); end; end; procedure TForm1.Button1Click(Sender: TObject); begin CopyFileWithProgressBar1('c:\Windows\Welcome.exe', 'c:\temp\Welcome.exe'); end; 2. // To show the estimated time to copy a file: procedure TForm1.CopyFileWithProgressBar1(Source, Destination: string); var FromF, ToF: file of byte; Buffer: array[0..4096] of char; NumRead: integer; FileLength: longint; t1, t2: DWORD; maxi: integer; begin AssignFile(FromF, Source); reset(FromF); AssignFile(ToF, Destination); rewrite(ToF); FileLength := FileSize(FromF); with Progressbar1 do begin Min := 0; Max := FileLength; t1 := TimeGetTime; maxi := Max div 4096; while FileLength 0 do begin BlockRead(FromF, Buffer[0], SizeOf(Buffer), NumRead); FileLength := FileLength - NumRead; BlockWrite(ToF, Buffer[0], NumRead); t2 := TimeGetTime; Min := Min + 1; // Show the time in Label1 label1.Caption := FormatFloat('0.00', ((t2 - t1) / min * maxi - t2 + t1) / 100); Application.ProcessMessages; Position := Position + NumRead; end; CloseFile(FromF); CloseFile(ToF); end; end; 3. // To show the estimated time to copy a file, using a callback function: 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 ; 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); end; 4. function CopyFileWithProgressBar2(TotalFileSize, TotalBytesTransferred, StreamSize, StreamBytesTransferred: LARGE_INTEGER; dwStreamNumber, dwCallbackReason: DWORD; hSourceFile, hDestinationFile: THandle; lpData: Pointer): DWORD; stdcall; begin // just set size at the beginning if dwCallbackReason = CALLBACK_STREAM_SWITCH then TProgressBar(lpData).Max := TotalFileSize.QuadPart; TProgressBar(lpData).Position := TotalBytesTransferred.QuadPart; Application.ProcessMessages; Result := PROGRESS_CONTINUE; end; function TForm1.CopyWithProgress(sSource, sDest: string): Boolean; begin // set this FCancelled to true, if you want to cancel the copy operation FCancelled := False; Result := CopyFileEx(PChar(sSource), PChar(sDest), @CopyFileWithProgressBar2, ProgressBar1, @FCancelled, 0); end; end;