function GetLineCharPtr(aRow : Integer): pointer;
Returns a pointer to the first element of the characters array.
Each element in the characters array is either a single byte character, or a two-byte UNICODE character. The original call to the Create constructor defines which it is.
This method is not limited to the current scrolling region; it applies to the whole screen. Thus, the pointer that is returned points to the data for column 1 of the required row.