回复 2楼 mooii
											语句经过编译成功,谢谢回复!
这个文件读写的指针吗?
下面是文件复制的程序,如果要在这个程序中使用上面的语句来移动指针,只复制文件的一部分内容,怎么写呢?
procedure TForm1.Button1Click(Sender: TObject);
var 
 FromF, ToF: file; 
 NumRead, NumWritten: Integer; 
 Buf: array[1..2048] of Char; 
begin
   if OpenDialog1.Execute then begin
   AssignFile(FromF, OpenDialog1.FileName); 
   Reset(FromF, 1); { Record size = 1 }
   if SaveDialog1.Execute then { Display Save dialog box} 
   begin 
     AssignFile(ToF, SaveDialog1.FileName); { Open output file } 
     Rewrite(ToF, 1); { Record size = 1 } 
     Canvas.TextOut(10, 10, 'Copying ' + IntToStr(FileSize(FromF)) 
+ ' bytes...'); 
     repeat 
       BlockRead(FromF, Buf, SizeOf(Buf), NumRead);
       BlockWrite(ToF, Buf, NumRead, NumWritten);
    until (NumRead = 0) or (NumWritten <> NumRead); 
    CloseFile(FromF); 
    CloseFile(ToF);
  end; 
end;
end;
[此贴子已经被作者于2016-3-9 16:50编辑过]