(VB.NET) Append Dir Tree to Existing Zip w/out Rewriting Entire Zip

Demonstrates how to use the QuickAppend method to append a directory tree to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive.

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Dim success As Boolean = False

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

Dim zip As New Chilkat.Zip

' The NewZip method only initializes the Zip object -- it does
' not create or write a .zip file.
success = zip.NewZip("notUsed.zip")
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


' Add a references to all files in a directory tree.
' Note: this does not read or compress the file contents --
' it simply adds file references to the zip object.
Dim recurse As Boolean = True
success = zip.AppendFiles("c:/temp/abc123/*",recurse)
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


' 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.
success = zip.QuickAppend("preExisting.zip")
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success!")

' Note: Additional files, directory trees, or in-memory data
' can be appended by calling AddFile, AppendFiles,
' AddString, AddBd, AddSb, etc. multiple times.
' Whatever files and/or in-memory data that are referenced by
' this zip object will be appended to preExisting.zip when
' QuickAppend is called