SQL Server

Ungzip Base64 String

See more Gzip Examples

Suppose you have a gzip in base64 representation that contains a text file, such as XML. This example shows how to decompress and access the string. 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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

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

    DECLARE @gzipBase64 nvarchar(4000)
    SELECT @gzipBase64 = 'H4sIAAAAAAAE ... X6aZjXO3EwAA'

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

    EXEC sp_OAMethod @bd, 'AppendEncoded', @success OUT, @gzipBase64, 'base64'

    EXEC sp_OAMethod @gzip, 'UncompressBd', @success OUT, @bd
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @gzip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @gzip
        EXEC @hr = sp_OADestroy @bd
        RETURN
      END

    DECLARE @strXml nvarchar(4000)
    EXEC sp_OAMethod @bd, 'GetString', @strXml OUT, 'utf-8'

    PRINT 'XML:'

    PRINT @strXml

    EXEC @hr = sp_OADestroy @gzip
    EXEC @hr = sp_OADestroy @bd


END
GO