SQL Server

Convert Inline Data-URL Images to Related Parts

Demonstrates the Chilkat Email.ConvertInlineImages method, which converts images embedded inline within HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by cid:. This example sets an HTML body containing a data-URL image and converts it.

Background: HTML can embed an image two ways: as a data: URL (the base64 bytes sit right in the src attribute) or as a related part referenced by cid:. Many email clients don't render data: URLs for security reasons, so converting them to proper multipart/related parts — the traditional email way to embed images — greatly improves how reliably the images display.

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

    --  Demonstrates the ConvertInlineImages method, which converts images embedded inline within
    --  HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by
    --  CID.

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

    EXEC sp_OASetProperty @email, 'Subject', 'Convert inline images'

    --  An HTML body with a base64 data-URL image (a 1x1 PNG).
    EXEC sp_OAMethod @email, 'SetHtmlBody', NULL, '<html><body><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg=="/></body></html>'


    EXEC sp_OAGetProperty @email, 'NumRelatedItems', @iTmp0 OUT
    PRINT 'NumRelatedItems before = ' + @iTmp0

    --  Convert the inline data-URL image(s) to multipart/related parts referenced by CID.

    EXEC sp_OAMethod @email, 'ConvertInlineImages', @success OUT
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @email, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @email
        RETURN
      END


    EXEC sp_OAGetProperty @email, 'NumRelatedItems', @iTmp0 OUT
    PRINT 'NumRelatedItems after = ' + @iTmp0

    EXEC @hr = sp_OADestroy @email


END
GO