(PureBasic) Find a ZIP Entry by EntryID Using EntryById

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This example demonstrates how to use the EntryById method to retrieve a ZIP entry using its unique EntryID.

Each ZipEntry object has an EntryID property that uniquely identifies the entry within the currently open ZIP object.

This is useful when:

• An application stores EntryID values for later use
• ZIP entries need to be retrieved without searching by filename
• Multiple entries may have similar names or paths

The example:

• Opens a ZIP archive
• Retrieves an entry using EntryAt
• Saves the entry's EntryID
• Uses EntryById to retrieve the same entry later

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat PureBasic Module Download Chilkat PureBasic Module

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

Procedure ChilkatExample()

    success.i = 0

    success = 0

    ; Open an existing ZIP archive.
    zip.i = CkZip::ckCreate()
    If zip.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkZip::ckOpenZip(zip,"example.zip")
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        ProcedureReturn
    EndIf

    ; Retrieve 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

    Debug "Original entry:"
    Debug "  FileName: " + CkZipEntry::ckFileName(entry)
    Debug "  EntryID: " + Str(CkZipEntry::ckEntryID(entry))
    Debug ""

    ; Save the EntryID for later use.
    entryId.i = CkZipEntry::ckEntryID(entry)

    ; Create another ZipEntry object.
    entry2.i = CkZipEntry::ckCreate()
    If entry2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Retrieve the same entry using EntryById.
    success = CkZip::ckEntryById(zip,entryId,entry2)
    If success = 0
        Debug CkZip::ckLastErrorText(zip)
        CkZip::ckDispose(zip)
        CkZipEntry::ckDispose(entry)
        CkZipEntry::ckDispose(entry2)
        ProcedureReturn
    EndIf

    Debug "Entry retrieved by EntryID:"
    Debug "  FileName: " + CkZipEntry::ckFileName(entry2)
    Debug "  EntryID: " + Str(CkZipEntry::ckEntryID(entry2))
    Debug ""

    ; The filenames and EntryID values should match.
    CkZip::ckCloseZip(zip)

    Debug "Done."


    CkZip::ckDispose(zip)
    CkZipEntry::ckDispose(entry)
    CkZipEntry::ckDispose(entry2)


    ProcedureReturn
EndProcedure