SQL Server

The MIME Content-Type Header Field

See more MIME Examples

Explains the ContentType property and the Content-Type header field including the various attributes that may be included. SQL Server

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

    --  Every part in a MIME messsage should include a Content-Type header field.
    --  The Content-Type indicates the type of content contained in the MIME part.
    --  For example: text/plain, image/jpeg, application/pdf, application/json, multipart/mixed, etc.

    --  Multipart content types are those where the MIME part's body is composed of N inner MIME messages,
    --  separated by a boundary string.
    --  This is how MIME gets a nested, tree-like structure.  The most common multipart MIME types
    --  are (for email related MIME) multipart/mixed, multipart/alternative, and multipart/related,
    --  and for HTTP related MIME, it is multipart/form-data.

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

    --  The Content-Type header field can be set or modified in two ways.
    --  1) By setting the ContentType, Micalg, Name, Charset, Boundary, or Protocol properties.
    --     Setting the ContentType property sets the primary value (such as "text/plain") of the header field.
    --     Each of the other properties listed above will replace or add a particular attribute value.

    --  2) By setting the entire contents of the ContentType header with the SetHeaderField method.
    --     This updates each of the Content-Type related properties.

    --  For example:
    EXEC sp_OASetProperty @mime, 'ContentType', 'text/plain'
    EXEC sp_OASetProperty @mime, 'Charset', 'utf-8'

    --  The Content-Type header field contains this:
    --      Content-Type: text/plain; charset=utf-8
    EXEC sp_OAMethod @mime, 'GetEntireHead', @sTmp0 OUT
    PRINT @sTmp0

    PRINT '-'

    EXEC sp_OAMethod @mime, 'SetHeaderField', @success OUT, 'Content-Type', 'image/jpeg; name="kitty.jpg"'
    --  The Content-Type header field now contains this:
    --      Content-Type: image/jpeg; name="kitty.jpg"
    EXEC sp_OAMethod @mime, 'GetEntireHead', @sTmp0 OUT
    PRINT @sTmp0

    PRINT '-'

    --  Notice how the properties have been updated:

    EXEC sp_OAGetProperty @mime, 'ContentType', @sTmp0 OUT
    PRINT 'ContentType property: ' + @sTmp0

    EXEC sp_OAGetProperty @mime, 'Charset', @sTmp0 OUT
    PRINT 'Charset property: ' + @sTmp0

    EXEC sp_OAGetProperty @mime, 'Name', @sTmp0 OUT
    PRINT 'Name property: ' + @sTmp0

    PRINT '-'

    --  To change a particular attribute value, set the property.
    EXEC sp_OASetProperty @mime, 'Name', 'doggy.jpg'
    EXEC sp_OAMethod @mime, 'GetEntireHead', @sTmp0 OUT
    PRINT @sTmp0

    PRINT '-'

    --  To remove an attribute value from the Content-Type header,
    --  set the property to an empty string.
    EXEC sp_OASetProperty @mime, 'Name', ''
    EXEC sp_OAMethod @mime, 'GetEntireHead', @sTmp0 OUT
    PRINT @sTmp0

    PRINT '-'

    EXEC @hr = sp_OADestroy @mime


END
GO