(Lianja) Determine if a Zip is Encrypted or Password-Protected

Determines whether or not a zip archive is AES encrypted or password-protected.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loZip = createobject("CkZip")

// An encrypted or password-protected zip can be opened
// without specifying the password.  However, the contents
// of the files cannot be unzipped without providing the correct
// password.

llSuccess = loZip.OpenZip("something.zip")
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

// If the zip is password-protected, meaning that it uses
// the old (insecure) Zip 2.0 encryption, then the
// PasswordProtect property will be .T.
llBPwdProt = loZip.PasswordProtect
if (llBPwdProt) then
    ? "This zip is password-protected."
endif

// If the zip is AES encrypted (WinZip compatible) then
// the Encryption property will be equal to 4.
lnEncValue = loZip.Encryption
if (lnEncValue = 4) then
    ? "This zip is AES encrypted."
endif

// If the Encryption property = 0, then the zip is NOT
// strong encrypted, and is either password-protected or
// entirely unencrypted, depending on the value of the
// PasswordProtect property.

loZip.CloseZip()


release loZip