var
F: TextFile;
S: string;
i: integer;
begin
i:=0;
if OpenDialog1.Execute then
begin
AssignFile(F, OpenDialog1.FileName);
Reset(F);
while not f.eof do
begin
i:=i+1;
if i=5 then continue; // 不读第五行;
Readln(F, S);
Edit1.Text := S;
end;
CloseFile(F);
end;
end;
Seek(var F; N: Longint)
一个delphi例子:
var
f: file of Byte;
size : Longint;
S: string;
y: Integer;
begin
if OpenDialog1.Execute then
begin
AssignFile(f, OpenDialog1.FileName);
Reset(f);
size := FileSize(f);
S := 'File size in bytes: ' + IntToStr(size);
y := 10;
Canvas.TextOut(5, y, S);
y := y + Canvas.TextHeight(S) + 5;
S := 'Seeking halfway into file...';
Canvas.TextOut(5, y, S);
y := y + Canvas.TextHeight(S) + 5;
Seek(f,size div 2);
S := 'Position is now ' + IntToStr(FilePos(f));
Canvas.TextOut(5, y, S);
CloseFile(f);
end;
end;