(SQL Server) Encode Integer to Hex or Base64 using N Bytes

Demonstrates how to write an integer to N bytes (little-endian or big-endian) and return the bytes in any encoding such as hex, base64, etc.

Note: This example requires Chilkat v9.5.0.77 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- 1193046 decimal is equal to 0x123456 hex.
    DECLARE @value int
    SELECT @value = 1193046

    -- Write the integer in 8 bytes using little-endian byte-order and return as hex
    DECLARE @bLittleEndian int
    SELECT @bLittleEndian = 1
    DECLARE @s nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'EncodeInt', @s OUT, @value, 8, @bLittleEndian, 'hex'
    -- The output is: 5634120000000000

    PRINT @s

    -- Now use big-endian...
    SELECT @bLittleEndian = 0
    EXEC sp_OAMethod @crypt, 'EncodeInt', @s OUT, @value, 8, @bLittleEndian, 'hex'
    -- The output is: 0000000000123456

    PRINT @s

    -- Instead of hex, get the 8 bytes using base64.
    EXEC sp_OAMethod @crypt, 'EncodeInt', @s OUT, @value, 8, @bLittleEndian, 'base64'
    -- The output is: AAAAAAASNFY=

    PRINT @s

    EXEC @hr = sp_OADestroy @crypt


END
GO