TextFile读写

function readFromFile:string;
var s,s2:string; F:TextFile;
begin
  OpenDialog1.FileName:='';
  OpenDialog1.Filter:='*.xml|*.xml'; 
  s:='';  result:='';
  if not OpenDialog1.Execute then exit;

  assignfile(F,OpenDialog1.FileName);
  try
　  Reset(F);
　  while not Eof(F) do
　  begin
　　  Readln(F, s2);
　　  s:=s+s2;
　  end;
　  result:=s;
  finally
　  closefile(f);
  end;
end;

PRocedure writeToFile(s:string);
var F:TextFile;
begin
　 assignfile(f,SaveDialog1.fileName);
　 try
　　 rewrite(f);
　　 writeln(f,s1);
　 finally
　　 closefile(f);
　 end;
end;