用delphi删除一文件夹下面的全部文件

DeleteFile('c:/temp/abc.txt')
//删除了ABC.TXT文件。我如何一下子把C：/temp目录下的文件自动一个接一个的删除。如何做循环判断？？？

function TMainForm.DeleteDirectory(NowPath: string): Boolean; //删除整个目录
var
search: TSearchRec;
ret: integer;
key: string;
begin
if NowPath[Length(NowPath)] <> '/' then
NowPath := NowPath + '/';
key := Nowpath + '*.*';
ret := findFirst(key, faanyfile, search);
while ret = 0 do begin
if ((search.Attr and fadirectory) = faDirectory)
then begin
if (Search.Name <> '.') and (Search.name <> '..') then
DeleteDirectory(NowPath + Search.name);
end else begin
if ((search.attr and fadirectory) <> fadirectory) then begin
deletefile(NowPath + search.name);
end;
end;
ret := FindNext(search);
end;
findClose(search);
removedir(NowPath);
result := True;
end;