GetFieldInfo (by Index/Column Number) 
Purpose
Obtains information about a field by index or column number.
Syntax
const RFC_FIELD_INFO* GetFieldInfo(int nIndex) const;
Return Value
Pointer to a constant RFC_FIELD_INFO struct containing the information. NULL if no field information with that column number can be found.
Parameters
nIndex
: Column number of the field, beginning from 0.Related Information
GetFieldInfo (by Name) The RFC_FIELD_INFO Structure