SExistRestriction

The SExistRestriction structure describes an exist restriction which is used to test whether or not a particular property exists as a column in the table.

Quick Info

Header file:

MAPIDEFS.H

typedef struct _SExistRestriction 
{ 
     ULONG ulReserved1; 
     ULONG ulPropTag; 
     ULONG ulReserved2; 
} SExistRestriction;

Members

ulReserved1: Reserved; must be zero.
ulPropTag: Property tag identifying the column to be tested for existence in each row.
ulReserved2: Reserved; must be zero.

Remarks

The exist restriction is used to guarantee meaningful results for other types of restrictions that involve properties, such as property and content restrictions. When a restriction that involves a property is passed to IMAPITable::Restrict or IMAPITable::FindRow and the property does not exist, the results of the restriction are undefined. By creating an AND restriction that joins the property restriction with an exist restriction, a caller can be guaranteed accurate results.

Exist restrictions cannot be used with subobject properties — properties that have type PT_OBJECT.

For more information on the SExistRestriction structure, see About Restrictions.