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As an aid to understanding the ASCIIFileClass, it is useful to organize its methods into two large categories according to their expected use--the primary interface and the virtual methods. This organization reflects what we believe is typical use of the ASCIIFileClass methods.

**Non-Virtual Methods**

The non-virtual methods, which you are likely to call fairly routinely from your program, can be further divided into three categories:

**Housekeeping (one-time) Use:**

|  | Init | initialize the ASCIIFileClass object |
|  | Kill | shut down the ASCIIFileClass object |

**Mainstream Use:**

|  | GetLastLineNo | return last line number |
|  | GetLine | return line of text |
|  | GetPercentile | convert file position to percentage |
|  | SetPercentile | convert percentage to file position |

**Occasional Use:**

|  | GetFilename | return the filename |
|  | Reset | reset the ASCIIFileClass object |

**Virtual Methods**

Typically you will not call these methods directly--the Non-Virtual Methods call them. However, we anticipate you will often want to override these methods, and because they are virtual, they are very easy to override. These methods do provide reasonable default behavior in case you do not want to override them.

|  | GetDOSFilename | prompt end user to select a file |
|  | FormatLine | a virtual to format text |
|  | SetLine | position to specific line |
|  | ValidateLine | a virtual to implement a filter |