InstallShield 判断.NetFramework是否安装

export prototype BOOL JudgeDotNetFramework();
function BOOL JudgeDotNetFramework()
begin
 RegDBSetDefaultRoot(HKEY_LOCAL_MACHINE);
 if (RegDBKeyExist ("SOFTWARE\\Microsoft\\.NETFramework") < 0) then 
  return FALSE;
 else
  return TRUE;
 endif;
end;