拷贝文件时有进度显示 (2000年8月22日).txt

来自「自己对DELPHI学习的一点体会」· 文本 代码 · 共 38 行

拷贝文件时有进度显示 (2000年8月22日) 

本站更新  分类:   作者:srw  推荐:   阅读次数:1115  
(http://www.codesky.net)  

--------------------------------------------------------------------------------


procedure TForm1.mycopyfile(sourcef,targetf:string);
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.label1.caption:=IntToStr(sizeof(buf)*n*100 div FileSize(FromF))+'100%';
application.ProcessMessages;
//显示进度
BlockWrite(ToF, Buf, NumRead, NumWritten);
inc(n);
until (NumRead = 0) or (NumWritten <> NumRead);
form1.Label1.Caption:='100%';
CloseFile(FromF);
CloseFile(ToF);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
mycopyfile('e:\components\tv2k-w2k.zip','c:\a.zip');
end;