請問一個function |
尚未結案
|
totodog
一般會員 ![]() ![]() 發表:13 回覆:3 積分:3 註冊:2003-05-29 發送簡訊給我 |
|
Leeway
一般會員 ![]() ![]() 發表:2 回覆:18 積分:4 註冊:2003-06-13 發送簡訊給我 |
|
hagar
版主 ![]() ![]() ![]() ![]() ![]() ![]() 發表:143 回覆:4056 積分:4445 註冊:2002-04-14 發送簡訊給我 |
是在 Kylix 下嗎?是的話, 參考紅色部份: http://www.swissdelphicenter.ch/torry/showcode.php?id=330
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 < 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); 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; |
本站聲明 |
1. 本論壇為無營利行為之開放平台,所有文章都是由網友自行張貼,如牽涉到法律糾紛一切與本站無關。 2. 假如網友發表之內容涉及侵權,而損及您的利益,請立即通知版主刪除。 3. 請勿批評中華民國元首及政府或批評各政黨,是藍是綠本站無權干涉,但這裡不是政治性論壇! |