语法：

steam_is_overlay_enabled();

返回： 布尔值

描述

When using the Steam API, this function can be called to check that the Steam client API has the overlay functionality enabled.

例如：

global.steam_api = false;
if steam_initialised()
   {
   if steam_stats_ready() && steam_is_overlay_enabled()
      {
      global.steamapi = true;
      }
   }

The above code will set a global variable to true if the Steam client API is correctly initialised, along with the Steam statistics and overlay functionality, or it will set the variable to false otherwise.