IMimeMessageTree::SaveOffsetTable method

Article
05/31/2018

Saves the offset table of a message for quicker loading.

Syntax

HRESULT SaveOffsetTable(
  [in] IStream *pStream,
  [in] DWORD   dwFlags
);

Parameters

pStream [in]

Type: IStream*

Specifies a pointer to an IStream to save the offset table to.

dwFlags [in]

Type: DWORD

Specifies how an IMimeMessageTree object should be committed.

Value	Meaning
COMMIT_ONLYIFDIRTY 0x00000001	Indicates that if the message object is dirty, the message should internally commit all changes so that the method being called reflects the committed state of the message.
COMMIT_REUSESTORAGE 0x00000002	Indicates that if the message object needs to commit itself, it should reuse its current storage object. For example, if a message object is loaded from a client provided IStream, the message object saves itself back into that original IStream.
COMMIT_SMIMETRANSFERENCODE 0x00000004	Indicates secure messaging.

Return value

Type: HRESULT

Returns one of the following values.

Return code	Description
S_OK	Indicates success.
E_FAIL	Indicates that an unknown error has occurred.
E_INVALIDARG	Indicates that pStream is NULL.
E_OUTOFMEMORY	Indicates that an attempt to allocate memory failed.
IStream::Write	This method may return a failure result from the ISequentialStream::Write method.
MIME_E_UNKNOWN_BODYTREE_VERSION	Indicates that the version of the offset table is invalid or not supported.

Remarks

Offset tables are used to improve performance when loading a message. The offset table contains information about the message, which enables MimeOLE to quickly load the message. Typically, the first time a client loads a message, they should call IMimeMessageTree::SaveOffsetTable. Then, the next time the client loads the message, they should first call IMimeMessageTree::LoadOffsetTable before loading the actual message into the message object.

Using offset tables is optional.

Examples

The following code demonstrates how to save the offset table.

IMimeMessageTree::Load(*pMessageSource);
IMimeMessageTree::SaveOffsetTable(*pOffsetTable);

The following code demonstrates how to load a message with an offset table.

IMimeMessageTree::LoadOffsetTable(*pOffsetTable);
IMimeMessageTree::Load(*pMessageSource);

Requirements


Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Product	Outlook Express 6.0
Header	Mimeole.h
IDL	Mimeole.idl
DLL	Inetcomm.dll (version 6.0 or later)

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