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. Note: The QuickAppend method is new and available in the pre-release downloads, or in official releases dated after 6-October-2007.

Download Chilkat Zip ActiveX

Dim zip As New ChilkatZip2

Dim success As Long

'  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial")
If (success <> 1) Then
    MsgBox zip.LastErrorText
    Exit Sub
End If

'  The NewZip method only initializes the Zip object -- it does
'  not create or write a .zip file.
success = zip.NewZip("notUsed.zip")
If (success <> 1) Then
    MsgBox 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 Long
recurse = 1
success = zip.AppendFiles("c:/temp/abc123/*",recurse)
If (success <> 1) Then
    MsgBox 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 <> 1) Then
    MsgBox zip.LastErrorText
    Exit Sub
End If

MsgBox "Success!"

'  Note: Additional files, directory trees, or in-memory data
'  can be appended by calling AppendOneFileOrDir, AppendFiles,
'  AppendString, AppendData, 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.