Zero-based index of the character in the CSimpleStringT object. The iChar parameter must be greater than or equal to 0 and less than the value returned by GetLength. Otherwise, GetAt will generate an exception.
Call this method to return the one character specified by iChar. The overloaded subscript ([]) operator is a convenient alias for GetAt. The null terminator is addressable without generating an exception by using GetAt. However, it is not counted by GetLength, and the value returned is 0.