本文整理自网络，侵删。
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;
====================================================================================
以下例子是关于delphi复制文件，加上进度条的方法的例子的关键代码:
procedure TForm1.Button1Click(Sender: TObject);
const
getPath = 'c:\temp\get.rar';
setPath = 'c:\temp\set.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;
end.
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/shuaihj/archive/2011/01/11/6129551.aspx
相关阅读 >>
windows api 的数据类型与 Delphi 数据类型对照表
Delphi 如何把程序钉到windows7任务栏(修正版)
Delphi firedac 下的 sqlite [11] - 关于批量提交 sql 命令的测试
更多相关阅读请进入《Delphi》频道 >>
