(VB.NET) Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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Dim success As Boolean = False

Dim zip As New Chilkat.Zip

' Open an existing ZIP archive.
success = zip.OpenZip("c:/temp/example.zip")
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


' A ZIP archive may contain zero entries.
If (zip.NumEntries = 0) Then

    Debug.WriteLine("The ZIP archive is empty.")

    zip.CloseZip()
    Exit Sub
End If


' ------------------------------------------------------------
' Get the first ZIP entry.
' 
' EntryAt(0,entry) initializes the ZipEntry object so that
' it represents the first entry in the ZIP archive.
' 
Dim entry As New Chilkat.ZipEntry

success = zip.EntryAt(0,entry)
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


' ------------------------------------------------------------
' Iterate through all ZIP entries.
' 
' GetNext updates the same ZipEntry object so that it
' represents the next entry in the ZIP archive.
' 
While (success = True)

    If (entry.IsDirectory = True) Then

        Debug.WriteLine("[Directory] " & entry.FileName)

    Else

        Debug.WriteLine("[File] " & entry.FileName)
    End If


    ' Advance to the next entry.
    success = entry.GetNext()
End While

zip.CloseZip()

Debug.WriteLine("Done.")