SQL Server

Convert a MIME Entity to multipart/alternative

Demonstrates the Chilkat Mime.ConvertToMultipartAlt method, which wraps the current entity in a new outer multipart/alternative, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Use this to add an alternate rendering to an existing message — for example, promoting a plain-text message so an HTML version can be added alongside it. The original content becomes the first (least-preferred) alternative, and you append the richer representation after it. As with the mixed conversion, message-level headers move to the new outer entity.

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SQL Server

--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    EXEC sp_OAMethod @mime, 'LoadMimeFile', @success OUT, 'qa_data/message.eml'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        RETURN
      END

    --  Wrap the current entity in a new outer multipart/alternative entity.  The original entity
    --  becomes the first child, ready for an alternate representation to be added.
    EXEC sp_OAMethod @mime, 'ConvertToMultipartAlt', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        RETURN
      END

    --  Add an alternative representation of the same content.
    DECLARE @htmlPart int
    EXEC @hr = sp_OACreate 'Chilkat.Mime', @htmlPart OUT

    EXEC sp_OAMethod @htmlPart, 'SetBodyFromHtml', @success OUT, '<html><body>HTML alternative.</body></html>'
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @htmlPart, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        EXEC @hr = sp_OADestroy @htmlPart
        RETURN
      END
    EXEC sp_OAMethod @mime, 'AppendPart', @success OUT, @htmlPart
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @mime, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mime
        EXEC @hr = sp_OADestroy @htmlPart
        RETURN
      END


    EXEC sp_OAGetProperty @mime, 'NumParts', @iTmp0 OUT
    PRINT 'Number of parts: ' + @iTmp0

    EXEC @hr = sp_OADestroy @mime
    EXEC @hr = sp_OADestroy @htmlPart


END
GO