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(SQL Server) Unzip an AES Encrypted Text File directly into a String VariableA 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. Note: This example requires Chilkat v11.0.0 or greater.
-- 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 requires the Chilkat API to have been previously unlocked. -- See Global Unlock Sample for sample code. DECLARE @zip int EXEC @hr = sp_OACreate 'Chilkat.Zip', @zip OUT IF @hr <> 0 BEGIN PRINT 'Failed to create ActiveX component' 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, 'qa_data/hamlet.zip' IF @success = 0 BEGIN EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 EXEC @hr = sp_OADestroy @zip RETURN END DECLARE @entry int EXEC @hr = sp_OACreate 'Chilkat.ZipEntry', @entry OUT EXEC sp_OAMethod @zip, 'EntryOf', @success OUT, 'hamlet.xml', @entry IF @success = 0 BEGIN EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT PRINT @sTmp0 EXEC @hr = sp_OADestroy @zip EXEC @hr = sp_OADestroy @entry RETURN END -- lineEndingBehavior: -- 0 = leave unchanged. -- 1 = convert all to bare LF's -- 2 = convert all to CRLF's DECLARE @lineEndingBehavior int SELECT @lineEndingBehavior = 0 DECLARE @srcCharset nvarchar(4000) SELECT @srcCharset = 'utf-8' DECLARE @xmlText nvarchar(4000) EXEC sp_OAMethod @entry, 'UnzipToString', @xmlText OUT, @lineEndingBehavior, @srcCharset PRINT @xmlText EXEC @hr = sp_OADestroy @zip EXEC @hr = sp_OADestroy @entry END GO |
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