复制文件并显示进度 Delphi

Question

不是要出现WINDOWS的那个复制进度框而是要把进度呈现在程序中某一Progress上请各位高手把代码贴出让我学习学习。
小弟不胜感激！

Answer 1

procedure mycopyfile(sourcef,targetf:string;i:integer);
var
       FromF,ToF:file;
       NumRead,NumWritten:Integer;
       Buf:array[1..2048] of Char;
       n:integer;
begin
         AssignFile(FromF,sourcef);
         Reset(FromF,    1); {    Record    size    =    1    }
         AssignFile(ToF,targetf); {    Open    output    file    }
         Rewrite(ToF,    1); {    Record    size    =    1    }
         n:=0;   
         repeat
                   BlockRead(FromF,    Buf,    SizeOf(Buf),    NumRead);
                   form1.ProgressBar1.Position:=sizeof(buf)*n*100    div    FileSize(FromF)*i div 4;
                   application.ProcessMessages;
                   //显示进度
                   BlockWrite(ToF,    Buf,    NumRead,    NumWritten);
                   inc(n);
           until    (NumRead    =    0)    or    (NumWritten    <>    NumRead);
           form1.ProgressBar1.Position:=100;
           CloseFile(FromF);
           CloseFile(ToF);
end;

Answer 2

有个，windows api 可以BOOL CopyFileEx(
    LPCWSTR lpExistingFileName, // pointer to name of an existing file
    LPCWSTR lpNewFileName, // pointer to filename to copy to
    LPPROGRESS_ROUTINE lpProgressRoutine, // pointer to the callback function
    LPVOID lpData, // to be passed to the callback function
    LPBOOL pbCancel, // flag that can be used to cancel the operation
    DWORD dwCopyFlags // flags that specify how the file is copied
   );
 

Answer 3

procedure TForm1.Button1Click(Sender: TObject);
const
  getPath = 'C:\Documents and Settings\zhangxf\My Documents\Downloads\visual foxpro 5.0 zhinan.rar';
  setPath = 'c:\visual foxpro 5.0 zhinan.rar';
var
  getStream,setStream: TFileStream;
  num, n: Integer;
  buf: PByte;
  BufSize,block: Integer;
begin  if not FileExists(getPath) then
  begin
    ShowMessage('源文件不存在');
    Exit;
  end;  getStream := TFileStream.Create(getPath, fmOpenRead or fmShareExclusive);
  setStream := TFileStream.Create(setPath, fmCreate);  num := getStream.Size;
  setStream.Size := num;
  getStream.Position := 0;
  setStream.Position := 0;  BufSize := num;
  block := BufSize div 100;
  GetMem(buf, BufSize);  ProgressBar1.Max := 100;
  ProgressBar1.Min := 0;
  ProgressBar1.Position := 0;  while num <> 0 do
  begin
    Application.ProcessMessages;
    n := block;
    if n > num then n := num;
    getStream.ReadBuffer(buf^, n);
    setStream.WriteBuffer(buf^, n);
    ProgressBar1.Position := Trunc((1 - num / BufSize) * 100);
    Dec(num, n);
  end;  FreeMem(buf, BufSize);
  getStream.Free;
  setStream.Free;  ShowMessage('复制完毕');
  ProgressBar1.Position := 0;
end;