Unzip an AES Encrypted Text File directly into a String Variable

A common need is to unzip from an AES encrypted Zip archive directly into a string variable, such that the unencrypted file never resides on disk, even temporarily. This example shows how to do it.

Download Chilkat Zip ActiveX

CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @zip int
    EXEC @hr = sp_OACreate 'Chilkat.Zip2', @zip OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int

    --  Any string unlocks the component for the 1st 30-days.
    EXEC sp_OAMethod @zip, 'UnlockComponent', @success OUT, 'Anything for 30-day trial'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    --  This example opens a WinZip-compatible AES encrypted
    --  .zip that contains a single file: hamlet.xml.

    --  It decrypts and unzips hamlet.xml directly into a string
    --  variable.
    EXEC sp_OAMethod @zip, 'SetPassword', NULL, 'secret'
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'hamlet.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        RETURN
      END

    DECLARE @entry int

    DECLARE @xmlText nvarchar(4000)

    EXEC sp_OAMethod @zip, 'GetEntryByName', @entry OUT, 'hamlet.xml'
    IF Not (@entry Is NULL )
      BEGIN
        EXEC sp_OAMethod @entry, 'InflateToString2', @xmlText OUT

        PRINT @xmlText

      END
    ELSE
      BEGIN
        PRINT 'Failed to find entry in zip'
      END


END
GO