function createfile(filename:string):integer;
就这么用吧
procedure filelookup(filename:string);
var
tempfile:file;
filehandle:integer;
begin
if not fileexists(filename) then
filehandle:=createfile(filename);
if filehandle<>0 then
showmessage('file create success')
else
showmessage('Can not Create file');
end;