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SQL Server Examples

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(SQL Server) Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc.

This example shows how to do it..

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @bd int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.BinData', @bd OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    --  I created an extra-small GIF image for this example..
    DECLARE @success int
    EXEC sp_OAMethod @bd, 'LoadFile', @success OUT, 'qa_data/gif/xsmall.gif'
    IF @success <> 1
      BEGIN

        PRINT 'Failed to load GIF image file.'
        EXEC @hr = sp_OADestroy @bd
        RETURN
      END

    --  Show GIF bytes as base64:
    EXEC sp_OAMethod @bd, 'GetEncoded', @sTmp0 OUT, 'base64'
    PRINT @sTmp0

    --  This particular GIF in base64 is this:
    --  R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7

    --  Let's begin with an XML string:
    DECLARE @x nvarchar(4000)
    SELECT @x = '<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>'

    DECLARE @xml int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Xml', @xml OUT

    EXEC sp_OAMethod @xml, 'LoadXml', @success OUT, @x

    --  Get the base64 string:
    DECLARE @gifBase64 nvarchar(4000)
    EXEC sp_OAMethod @xml, 'GetChildContent', @gifBase64 OUT, 'def'


    PRINT @gifBase64

    --  Load bd with the base64 decoded bytes.
    EXEC sp_OAMethod @bd, 'Clear', @success OUT
    EXEC sp_OAMethod @bd, 'AppendEncoded', @success OUT, @gifBase64, 'base64'

    --  Save to a GIF file.
    EXEC sp_OAMethod @bd, 'WriteFile', @success OUT, 'qa_output/xsmall.gif'

    EXEC @hr = sp_OADestroy @bd
    EXEC @hr = sp_OADestroy @xml


END
GO

 

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