BtStartingPositionDirection 常数 | 
            
When your paper has multiple rows and columns of items on it, you must specify which direction to print your items in, either horizontally or vertically.This direction is returned as a constant with the StartingPositionDirection property.
The following constants are available.
| 
                     常数  | 
                
                     描述  | 
            
|---|---|
| 
                     btHorizontal  | 
                
                     Prints horizontally across one row before proceeding to the next row on the page.  | 
            
| 
                     btVertical  | 
                
                     Prints vertically down a column of items on the page before continuing to the next column of items.  | 
            
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