[C# PW API] Execute saved search and return environment attributes for results

Hi,

I am trying to execute a saved search via PW API, and would like to return all attributes from a specific environment along with the results. So far I have the following code:

public static int GetSavedSearchQueryId(string searchName, int parentQueryId, int projectId, bool personal)
{
    int user = personal ? PWWrapper.aaApi_GetCurrentUserId() : 0;
    IntPtr databuffer = PWWrapper.aaApi_SQueryDataBufferSelectSubItems2(parentQueryId, user, projectId);
    int count = PWWrapper.aaApi_DmsDataBufferGetCount(databuffer);
    
    for (int row = 0; row < count; ++row)
    { 
        string queryName = PWWrapper.aaApi_DmsDataBufferGetStringProperty(databuffer, 6, row);
        if(queryName == searchName)
        {
            int queryId = PWWrapper.aaApi_DmsDataBufferGetNumericProperty(databuffer, 1, row);
            return queryId;
        }
    }

    return 0;
}

static void GetPWDocumentsBySavedSearch(string searchName, int projectId, bool personal, bool populatePath)
{
    int queryId = Utils.GetSavedSearchQueryId(searchName, 0, projectId, personal); // This returns the "Query ID" of the saved search
    
    DataTable result;
    if (queryId > 0)
    {
        //Saved search found
        result = PWSearch.SearchForDocumentsByQueryId(queryId, populatePath); //This will return a DataTable with the list of documents found
    }
}

This all works fine, however I am struggling to figure out how I can best add custom attributes into the search results. It seems there are a couple of options available:

1. Iterate over each row in the result DataTable to manually retrieve attributes (slow, but easy to do!) - EDIT: Not required if you just use SQL queries on the db side to search and join attributes table
2. Use a different search mechanism such as aaApi_FindDocuments (not sure how to do this, but seems to be the more desirable approach given the search query is executed in a single request)

Not sure if there are any other options that I've missed. Option 2 seems to be a lot more complex in comparison to option 1, given that it requires structs that don't make much sense to me after reading the documentation. It appears as though I need to do something like the following:

// 1. Select Criteria buffer
IntPtr criteriabuffer = PWWrapper.aaApi_SQueryCriDataBufferSelect(queryId);

// 2. Generate list of DocumentRequestColumns (the hard part!)
PWWrapper.DocumentRequestColumns requestColumns = new PWWrapper.DocumentRequestColumns() 
{//No idea what I'm doing here, the documentation is confusing me :D
    properties = { ??? },
    padding = ???,
    columns = { ??? }
};

// 3. Execute search
bool cancel = false;
IntPtr results = IntPtr.Zero;
PWWrapper.aaApi_FindDocumentsToBuffer(criteriabuffer, requestColumns, ref cancel, ref results);

But the reality is I don't know how to generate that struct properly... If anyone has any pointers (pardon the pun) please let me know!
Thanks,

Edward