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PR_SUBJECT_PREFIX

4/8/2010

The PR_SUBJECT_PREFIX property contains a subject prefix that typically indicates some action on a message, such as "FW: " for forwarding.

Additional Information

May be exposed by:

Message objects

Identifier:

0x003D

Property type:

PT_TSTRING

Property tag:

0x003D001F

Remarks

The PR_SUBJECT_PREFIX property is recommended on all message objects.

The subject prefix consists of one or more alphanumeric characters, followed by a colon and a space (which are part of the prefix). It must not contain any nonalphanumeric characters before the colon. Absence of a prefix can be represented by an empty string or by PR_SUBJECT_PREFIX not being set.

If PR_SUBJECT_PREFIX is set explicitly, it can be of any length and use any alphanumeric characters, but it must match a substring at the beginning of the PR_SUBJECT property. If PR_SUBJECT_PREFIX is not set by the sender and must be computed, its contents are more restricted. The rule for computing the prefix is that PR_SUBJECT must begin with one, two, or three letters (alphabetic only) followed by a colon and a space. If such a substring is found at the beginning of PR_SUBJECT, it then becomes PR_SUBJECT_PREFIX (and also stays at the beginning of PR_SUBJECT). Otherwise PR_SUBJECT_PREFIX remains unset.

The subject properties are typically small strings of fewer than 256 characters, and a message store provider is not obligated to support the OLE IStream interface on them. A client should always attempt access through the IMAPIProp interface first, and resort to IStream only if MAPI_E_NOT_ENOUGH_MEMORY is returned.

Requirements

Header mapitags.h
Library cemapi.lib
Windows Embedded CE Windows CE 3.0 and later
Windows Mobile Pocket PC 2002 and later, Smartphone 2002 and later

See Also

Other Resources

Windows Mobile Defined MAPI Properties