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CheckItem() void Arg::CheckItem ( SdsCodeType  code, StatusType *  status, long  ndims = -1, long *  dims = 0  ) inline Check an item has a required structure. A common requirement for the user of the SDS library is to check that a specified SDS item has the right format - type code, number of dimensions and dimensions. This utility function implements such a check. See also ArgCheckItem() Parameters code SDS Code we expect. The normal SDS code values, or ARG_STRING, in which case we mean SDS_CHAR but the ndims value is bumped by 1 automatically. If specified as -1, then the code is ignored. status Inherited status. ndims The expected number of dimensions. 0 to SDS_C_MAXARRAYDIMS (7) or a maximum one less then this if code=ARG_STIRNG. If specified as -1, then don't check ndims. dims The expected dimensions. Only used if ndims>0 or code=ARG_STRING. Only ndims values are used (or ndims+1 if code=ARG_STRING). If the value is negative or zero, the value is ignored, otherwise they must match. Note - long, not the unsigned long that SDS dimension arrays noramlly are. A null pointer can be supplied, which is equivalent of an array of -1 values.