SQL Server

Extract data:image/png;base64 from HTML

See more Base64 Examples

Demonstrates how to extract base64 image data from HTMl and save to files. SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    DECLARE @bd int
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bd OUT

    DECLARE @sbFilename int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbFilename OUT

    DECLARE @index int
    SELECT @index = 1

    EXEC sp_OAMethod @sb, 'LoadFile', @success OUT, 'qa_data/html/oresp body.txt', 'utf-8'
    -- Assume success.

    EXEC sp_OAGetProperty @sb, 'Length', @iTmp0 OUT
    PRINT 'length = ' + @iTmp0

    DECLARE @mayHaveMore int
    SELECT @mayHaveMore = 1
    WHILE @mayHaveMore = 1
      BEGIN

        -- Get the base64 between the 1st occurrence "data:image/png;base64," and "'"
        DECLARE @sBase64 nvarchar(4000)
        EXEC sp_OAMethod @sb, 'GetBetween', @sBase64 OUT, 'data:image/png;base64,', ''''

        -- If nothing is found, then we'll exit the loop because there are no more.
        EXEC sp_OAGetProperty @sb, 'LastMethodSuccess', @mayHaveMore OUT

        EXEC sp_OAGetProperty @sb, 'LastMethodSuccess', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN
            -- Found something.
            -- Load into bd and save.
            EXEC sp_OAMethod @bd, 'LoadEncoded', @success OUT, @sBase64, 'base64'

            EXEC sp_OAMethod @sbFilename, 'SetString', @success OUT, 'qa_output/png_'
            EXEC sp_OAMethod @sbFilename, 'AppendInt', @success OUT, @index
            EXEC sp_OAMethod @sbFilename, 'Append', @success OUT, '.png'

            EXEC sp_OAMethod @sbFilename, 'GetAsString', @sTmp0 OUT
            EXEC sp_OAMethod @bd, 'WriteFile', @success OUT, @sTmp0

            -- Replace "data:image/png;base64" with "data:image-png;base64" so the next iteration finds the next occurrence.
            EXEC sp_OAMethod @sb, 'ReplaceFirst', @success OUT, 'data:image/png;base64', 'data:image-png;base64'
          END

        SELECT @index = @index + 1
      END

    -- Restore our replacements..
    DECLARE @count int
    EXEC sp_OAMethod @sb, 'Replace', @count OUT, 'data:image-png;base64', 'data:image/png;base64'


    PRINT 'All done.'

    EXEC @hr = sp_OADestroy @sb
    EXEC @hr = sp_OADestroy @bd
    EXEC @hr = sp_OADestroy @sbFilename


END
GO