SQL Server

Get a Header Attribute of an Attached Message

Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

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-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    --  Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
    --  value for the Nth attached (embedded) email.  The first argument is the zero-based
    --  attached-message index, the second is the header field name, and the third is the attribute name.

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

    EXEC sp_OASetProperty @innerEmail, 'Subject', 'Embedded message'
    EXEC sp_OASetProperty @innerEmail, 'From', 'alice@example.com'
    EXEC sp_OAMethod @innerEmail, 'AddTo', @success OUT, 'Bob', 'bob@example.com'

    --  Attach it to an outer email as a message/rfc822 part.
    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OASetProperty @email, 'Subject', 'Has an attached message'
    EXEC sp_OAMethod @email, 'AttachEmail', @success OUT, @innerEmail
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @email, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @innerEmail
        EXEC @hr = sp_OADestroy @email
        RETURN
      END

    --  Get the "filename" attribute of the "Content-Disposition" header of the first
    --  attached message (index 0).
    DECLARE @fname nvarchar(4000)
    EXEC sp_OAMethod @email, 'GetAttachedMessageAttr', @fname OUT, 0, 'Content-Disposition', 'filename'

    PRINT 'Attached message filename attribute: ' + @fname

    EXEC @hr = sp_OADestroy @innerEmail
    EXEC @hr = sp_OADestroy @email


END
GO