The CDF_ATTGET procedure reads an attribute entry from a Common Data Format file.
The entry number. If the attribute is variable in scope, this is either the name or number of the variable the attribute is to be associated with. If the attribute is global in scope, this is the actual gEntry. It is the user's responsibility to keep track of valid gEntry numbers. Normally gEntry numbers will begin with 0 or 1 and will increase up to MAXGENTRY (as reported in the GET_ATTR_INFO structure returned by CDF_CONTROL ), but this is not required.
Set this keyword equal to a named variable which will contain the CDF type of the attribute entry, returned as a scalar string. Possible returned values are: CDF_CHAR, CDF_UCHAR, CDF_INT1, CDF_BYTE, CDF_UINT1, CDF_UINT2, CDF_INT2, CDF_UINT4, CDF_INT4, CDF_REAL4, CDF_FLOAT, CDF_REAL8, CDF_DOUBLE, or CDF_EPOCH. If the type cannot be determined, "UNKNOWN" is returned.
Note that, as is true with variable data, attribute entries of type CDF_INT1, CDF_BYTE, CDF_UINT2, and CDF_UINT4 are converted into IDL supported datatypes (for example, data of type CDF_UINT2, data of the C-type unsigned short, is converted into IDL's INT, a signed integer. (So, an attribute that is 65535 as a CDF_UINT2 will appear as INT = -1 in IDL). In these cases, pay special attention to the return values.