B4X

Open a Zip Archive

See more Zip Examples

Demonstrates how to open a zip, or an encrypted .zip, or a legacy password-protected .zip. B4X

Dim success As Boolean = False

Dim zip As ChilkatZip
zip.Initialize("zip")

'  Open a non-encrypted .zip
success = zip.OpenZip("qa_data/zips/sample.zip")
If success <> True Then
    Log(zip.LastErrorText)
    Return
End If

Log("Num entries = " & zip.NumEntries)

'  ...
'  ...

zip.CloseZip

'  ----------------------------------------------------------------------------
'  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)
zip.DecryptPassword = "thePassword"

success = zip.OpenZip("qa_data/zips/encryptedSamples/ziptest_256.zip")
If success <> True Then
    Log(zip.LastErrorText)
    Return
End If

Log("Num entries = " & zip.NumEntries)

'  ...
'  ...

zip.CloseZip