(Lianja) Creates an AES Encrypted Zip with One File Unencrypted

Demonstrates how to create an AES encrypted zip, but also containing one file that is not encrypted. The way we do it is to first create an AES encrypted zip in the usual way, and then we append an unecrypted file to it.

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loZip = createobject("CkZip")

llSuccess = loZip.NewZip("qa_output/aes_with_one_unencrypted.zip")
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

// Set properties to indicate that the Zip should be
// AES encrypted.

// A value of 4 indicates WinZip compatible AES encryption.
loZip.Encryption = 4

// Key length can be 128, 192, or 256 bits.
loZip.EncryptKeyLength = 128

// Set the password for AES encryption:
loZip.EncryptPassword = "myPassword"

// Exclude the file helloWorld.txt
// This file will be added unencrypted to the .zip
loSaExclusions = createobject("CkStringArray")
loSaExclusions.Append("helloWorld.txt")
loZip.SetExclusions(loSaExclusions)

loZip.VerboseLogging = .T.

// Add a directory tree to be zipped.
llRecurse = .T.
// Append from a directory relative to our current working directory.
loZip.AppendFromDir = "qa_data/filesToZip"
llSuccess = loZip.AppendFiles("*",llRecurse)
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    release loSaExclusions
    return
endif

? loZip.LastErrorText

// Writes qa_output/aes_with_one_unencrypted.zip
llSuccess = loZip.WriteZipAndClose()
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    release loSaExclusions
    return
endif

// ----------------------------------------------
// At this point, we have an encrypted .zip with all 
// files except for helloWorld.txt.
// We'll add helloWorld.txt (unencrypted) to the .zip we just created.

// The NewZip method only initializes the Zip object -- it does
// not create or write a .zip file.

llSuccess = loZip.NewZip("notUsed.zip")
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    release loSaExclusions
    return
endif

loSaExclusions.Clear()
loZip.SetExclusions(loSaExclusions)

// No encryption.
loZip.Encryption = 0

loZip.AppendFromDir = "qa_data/filesToZip"

// Add a reference to a file.  This is the file that will
// be added to a already-existing .zip.  
llSaveExtraPath = .F.
llSuccess = loZip.AppendOneFileOrDir("helloWorld.txt",llSaveExtraPath)
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    release loSaExclusions
    return
endif

// Appends the contents of the zip object to the preExisting.zip
// zip archive.  preExisting.zip is opened, and the files
// referenced by this zip object are streamed in, compressed,
// and appended to the end of the archive.
llSuccess = loZip.QuickAppend("qa_output/aes_with_one_unencrypted.zip")
if (llSuccess <> .T.) then
    ? loZip.LastErrorText
    release loZip
    release loSaExclusions
    return
endif

? "Success!"


release loZip
release loSaExclusions