the name of a field
the enum type of a field
a pointer to an int to set
Return: %TRUE if the value could be set correctly. If there was no field with @fieldname or the existing field did not contain an enum of the given type, this function returns %FALSE.
Sets the int pointed to by @value corresponding to the value of the given field. Caller is responsible for making sure the field exists, has the correct type and that the enumtype is correct.