语法：

steam_ugc_create_item(consumer_app_id, file_type);

Returns: Async ID

描述

This function is used to prepare the Workshop API and generate a published file ID for the item to be added. The function must be called before doing anything else with the item to be uploaded, as you will be required to use the unique published ID value that it returns in the Steam Async Event for updating. To use this function, you need to supply the Steam App ID for your game, and the use one of the following constants for the file_type argument:

When using this function it will return an async ID value which can then be parsed when the Steam Asynchronous event is triggerd to report the creation of the item. The event will contain the following key/map values in the async_load ds_map:

1. "id" - The async ID returned by the calling function
2. 
   
3. "result" - 操作的结果（实际值）。这将是 GML 常量 ugc_result_success 或其他一些实数。So you should check for this constant to ensure that the call was successful, and if otherwise somthing has not worked correctly. 返回的其余可能值显示为 Steam “EResult” 值的结果，你应该在 SDK 头文件 steamclientpublic.h 中看到所有 89 个可能值。
4. 
   
5. "event_type" - This key will hold the value "ugc_create_item"
6. 
   
7. "legal_agreement_required" - Will be true or false (see the Steam docs for more details)
8. 
   
9. "published_file_id" - This key holds the unique published ID for the item
10. 
    

Extended 举例：

In this example we first call the function and store the async ID value in a variable:

var app_id = steam_get_app_id();
new_item = steam_ugc_create_item(app_id, ugc_filetype_community);

This would then send off a request to the Steam API to create the new Worksop item, generating an async event which we would deal with as follows:

var event_id = async_load[?"id"];
if event_id == new_item
   {
   var type = async_load[?"event_type"];
   if type == "ugc_create_item"
      {
      global.Publish_ID = async_load[?"published_file_id"];
      }
   }

The above code checks the event type and if it is "ugc_create_item" then it retrieves the published file ID and stores it in a global variable for future reference.