VB.NET

Replace/Update a FIle in a .zip

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Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten. VB.NET

Dim success As Boolean = False

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

' First prepare a .zip and write it..
Dim zip As New Chilkat.Zip

zip.NewZip("qa_output/abc.zip")

' Add some files..
Dim charset As String = "utf-8"
zip.AddString("a.txt","aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",charset)
zip.AddString("b.txt","bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",charset)
zip.AddString("c.txt","cccccccccccccccccccccccccccccccccccc",charset)

' Write to qa_output/abc.zip
' This .zip contains three files: a.txt, b.txt, and c.txt
success = zip.WriteZipAndClose()

' -------------------------------------------------------------------
' Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
Dim zip2 As New Chilkat.Zip
zip2.OpenZip("qa_output/abc.zip")

Dim entry As New Chilkat.ZipEntry
If (zip2.EntryOf("b.txt",entry) = True) Then
    entry.ReplaceString("This is the new content.  bbbbbbbbbbbbbbbbbbbbbb","utf-8")
End If


' Write the modified .zip back to "abc.zip"
success = zip2.WriteZipAndClose()

Debug.WriteLine("success.")