B4X

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.

B4X

Dim success As Boolean = False

Dim zip As ChilkatZip
zip.Initialize("zip")

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


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

    Log("The ZIP archive is empty.")

    zip.CloseZip
    Return
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 ChilkatZipEntry
entry.Initialize("entry")

success = zip.EntryAt(0, entry)
If success = False Then
    Log(zip.LastErrorText)
    Return
End If


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

    If entry.IsDirectory = True Then

        Log("[Directory] " & entry.FileName)

    Else

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


    '  Advance to the next entry.
    success = entry.GetNext
Loop

zip.CloseZip

Log("Done.")