<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def getDriverName(self, nDriver, pchValue, unBufferSize):
 """Returns the length of the number of bytes necessary to hold this string including the trailing null."""


        fn = self.function_table.getDriverName
        result = fn(nDriver, pchValue, unBufferSize)
        return result