(PureBasic) 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.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkZip.pb"
IncludeFile "CkZipEntry.pb"

Procedure ChilkatExample()

    success.i = 0

    zip.i = CkZip::ckCreate()
    If zip.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Open an existing ZIP archive.
    success = CkZip::ckOpenZip(zip,"c:/temp/example.zip")
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        ProcedureReturn
    EndIf

    ; A ZIP archive may contain zero entries.
    If CkZip::ckNumEntries(zip) = 0

        Debug "The ZIP archive is empty."

        CkZip::ckCloseZip(zip)
        CkZip::ckDispose(zip)
        ProcedureReturn
    EndIf

    ; ------------------------------------------------------------
    ; Get the first ZIP entry.
    ; 
    ; EntryAt(0,entry) initializes the ZipEntry object so that
    ; it represents the first entry in the ZIP archive.
    ; 
    entry.i = CkZipEntry::ckCreate()
    If entry.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkZip::ckEntryAt(zip,0,entry)
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        CkZipEntry::ckDispose(entry)
        ProcedureReturn
    EndIf

    ; ------------------------------------------------------------
    ; Iterate through all ZIP entries.
    ; 
    ; GetNext updates the same ZipEntry object so that it
    ; represents the next entry in the ZIP archive.
    ; 
    While (success = 1)

        If CkZipEntry::ckIsDirectory(entry) = 1

            Debug "[Directory] " + CkZipEntry::ckFileName(entry)

        Else

            Debug "[File] " + CkZipEntry::ckFileName(entry)
        EndIf

        ; Advance to the next entry.
        success = CkZipEntry::ckGetNext(entry)
    Wend

    CkZip::ckCloseZip(zip)

    Debug "Done."


    CkZip::ckDispose(zip)
    CkZipEntry::ckDispose(entry)


    ProcedureReturn
EndProcedure