SQL Server

Open a Zip Archive

See more Zip Examples

Demonstrates how to open a zip, or an encrypted .zip, or a legacy password-protected .zip. 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 @zip int
    EXEC @hr = sp_OACreate 'Chilkat.Zip', @zip OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Open a non-encrypted .zip
    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'qa_data/zips/sample.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    EXEC sp_OAGetProperty @zip, 'NumEntries', @iTmp0 OUT
    PRINT 'Num entries = ' + @iTmp0

    -- ...
    -- ...

    EXEC sp_OAMethod @zip, 'CloseZip', NULL

    -- ----------------------------------------------------------------------------
    -- Open an encrypted zip...

    -- The two main types of encryption used in ZIP archives are Password-Protected and AES.
    -- 

    -- ---------------------------------------
    -- 1. Legacy Password-Protected Zip
    -- 
    -- This is the older and less secure method of encrypting ZIP archives. 
    -- It provides a basic level of security, but is considered weak by modern standards. 
    -- It is vulnerable to various attacks, including known-plaintext attacks and brute force attacks.
    -- Although Chilkat allows it, you shouldn't create new zip archives using legacy password-protection.

    -- ---------------------------------------
    -- 2. AES Encrypted Zip
    -- 
    -- AES encryption is a more modern and secure method for encrypting ZIP archives. 
    -- It provides strong encryption based on the AES algorithm, which is widely regarded as secure. 
    -- AES supports different key lengths, typically 128-bit, 192-bit, and 256-bit.

    -- When opening an encrypted zip, your application only needs to provide the correct password.
    -- The information about the type of encryption and the key length (if AES) is already embedded within the encrypted .zip.

    -- Provide the decrypt password because we are opening an existing .zip (decrypting)
    EXEC sp_OASetProperty @zip, 'DecryptPassword', 'thePassword'

    EXEC sp_OAMethod @zip, 'OpenZip', @success OUT, 'qa_data/zips/encryptedSamples/ziptest_256.zip'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @zip
        RETURN
      END

    EXEC sp_OAGetProperty @zip, 'NumEntries', @iTmp0 OUT
    PRINT 'Num entries = ' + @iTmp0

    -- ...
    -- ...

    EXEC sp_OAMethod @zip, 'CloseZip', NULL

    EXEC @hr = sp_OADestroy @zip


END
GO