2.2.1.7 PropertyMeta

The PropertyMeta structure represents the type, size, and meta-properties (specified in this section) of a property in a table.

 typedef struct {
   DWORD dataType;
   ULONG cbSize;
   DWORD flags;
 } PropertyMeta;

dataType: The eDataType (section 2.2.1.2) value that represents the data type of the property.

cbSize: A size, in bytes, associated with the property. The meaning of this value depends on the value of the dataType field and whether the fPROPERTY_FIXEDLENGTH flag is set in the flags field.

Value of dataType	fPROPERTY_FIXEDLENGTH set?	Meaning
eDT_ULONG	-	The fixed size of the property. MUST be set to 0x00000004.
eDT_GUID	-	The fixed size of the property. MUST be set to 0x00000010 (decimal 16).
eDT_BYTES	No	The maximum size of the property. A value of 0xFFFFFFFF indicates the property's size is unconstrained.
eDT_BYTES	Yes	The fixed size of the property.
eDT_LPWSTR	No	The maximum size of the property. A value of 0xFFFFFFFF indicates the property's size is unconstrained.
eDT_LPWSTR	Yes	The fixed size of the property. MUST be set to a multiple of 2.

flags: A bit field specifying the meta-properties of the property. MUST be a combination of zero or more of the following flags.

Value	Meaning
fPROPERTY_PRIMARYKEY 0x00000001	This property is part of the primary key for its table. MUST be set if fPROPERTY_NOTNULLABLE is set.
fPROPERTY_NOTNULLABLE 0x00000002	This property cannot be null.
fPROPERTY_FIXEDLENGTH 0x00000004	This eDT_BYTES or eDT_LPWSTR property has a fixed size. MUST NOT be set for properties of type eDT_ULONG or eDT_GUID.
fPROPERTY_NOTPERSISTABLE 0x00000008	This property contains sensitive data such as passwords that MUST NOT be written in plaintext to persistent storage.
fPROPERTY_CASEINSENSITIVE 0x00000020	This eDT_LPWSTR property MUST be treated as case-insensitive for purposes of comparison. MUST NOT be set for properties of type eDT_ULONG, eDT_GUID, or eDT_BYTES.