B4X

Append Dir Tree to Existing Zip w/out Rewriting Entire Zip

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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. B4X

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 ChilkatZip
zip.Initialize("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
    Log(zip.LastErrorText)
    Return
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
    Log(zip.LastErrorText)
    Return
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
    Log(zip.LastErrorText)
    Return
End If


Log("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.