SQL Server

Count the Messages in a multipart/digest Email

Demonstrates the read-only Chilkat Email.NumDigests property, which is the number of message/rfc822 parts contained within a multipart/digest enclosure. If no such enclosure exists, the value is 0. Digest indexes are zero-based; use GetDigestEmail to retrieve an individual bundled message as its own Email object. This example loads a digest email and lists each message's subject.

Background: A multipart/digest is a way to package many separate emails inside one carrier message — historically used by mailing lists to send a single daily "digest" containing all of that day's posts. Each bundled item is a complete message/rfc822 email with its own headers and body. This differs from NumAttachedMessages, which counts nested messages attached to an ordinary email rather than the members of a digest enclosure.

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--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    --  Demonstrates the read-only Email.NumDigests property, which is the number of
    --  message/rfc822 parts contained within a multipart/digest enclosure.  If there is no
    --  multipart/digest enclosure, the value is 0.  Digest indexes are zero-based.

    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  Load a multipart/digest email (a single email that bundles many messages).
    EXEC sp_OAMethod @email, 'LoadEml', @success OUT, 'qa_data/eml/digest.eml'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @email, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    DECLARE @n int
    EXEC sp_OAGetProperty @email, 'NumDigests', @n OUT

    PRINT 'NumDigests = ' + @n

    --  Retrieve each bundled message as its own Email object.
    DECLARE @digestEmail int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @digestEmail OUT

    DECLARE @i int

    SELECT @i = 0
    WHILE @i <= @n - 1
      BEGIN
        EXEC sp_OAMethod @email, 'GetDigestEmail', @success OUT, @i, @digestEmail


        EXEC sp_OAGetProperty @digestEmail, 'Subject', @sTmp0 OUT
        PRINT 'Digest ' + @i + ' subject: ' + @sTmp0
        SELECT @i = @i + 1
      END

    --  Note: Paths such as "qa_data/..." are relative local filesystem paths,
    --  relative to the current working directory of the running application.

    EXEC @hr = sp_OADestroy @email
    EXEC @hr = sp_OADestroy @digestEmail


END
GO