(AutoIt) Append Text Data to an Existing ZIP Entry Using ZipEntry.AppendString

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This example demonstrates how to use the ZipEntry.AppendString method to append text data to an existing ZIP entry.

The example opens an existing ZIP archive, locates a text file entry, and appends additional text to the end of the file contents.

An important concept demonstrated by this example is that appending data to a ZIP entry transforms the entry into an in-memory Data Entry (EntryType = 2).

For example:

• If the entry is a mapped entry from an opened ZIP archive (EntryType = 0), the compressed entry is first inflated into memory.
• If the entry is a referenced filesystem file (EntryType = 1), the file contents are first loaded into memory.

The new text is then appended to the uncompressed in-memory data, and the entry becomes a Data Entry.

After the ZIP archive is rewritten, the modified entry again becomes a mapped entry stored within the ZIP archive.

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Local $bSuccess = False

$oZip = ObjCreate("Chilkat.Zip")

; ------------------------------------------------------------
; Open an existing ZIP archive.
$bSuccess = $oZip.OpenZip("c:/temp/notes.zip")
If ($bSuccess = False) Then
    ConsoleWrite($oZip.LastErrorText & @CRLF)
    Exit
EndIf

; Locate a text file entry within the ZIP archive.
$oEntry = ObjCreate("Chilkat.ZipEntry")

$bSuccess = $oZip.EntryOf("notes/readme.txt",$oEntry)

If ($bSuccess <> False) Then

    ; --------------------------------------------------------
    ; At this point, the entry is a mapped entry because it
    ; originates from an opened ZIP archive.
    ; 
    ;     EntryType = 0
    ; 
    ConsoleWrite("Initial EntryType = " & $oEntry.EntryType & @CRLF)

    ; Append additional text to the ZIP entry.
    ; 
    ; The existing compressed ZIP entry is first inflated
    ; into memory. The new text is then appended.
    ; 
    ; After AppendString is called, the entry becomes
    ; an in-memory Data Entry:
    ; 
    ;     EntryType = 2
    ; 
    $bSuccess = $oEntry.AppendString(@CRLF & "Additional notes added later.","utf-8")

    If ($bSuccess = False) Then
        ConsoleWrite($oZip.LastErrorText & @CRLF)
        Exit
    EndIf

    ConsoleWrite("EntryType after AppendString = " & $oEntry.EntryType & @CRLF)

    ; --------------------------------------------------------
    ; Write the modified ZIP archive to a different file.
    ; 
    ; Changing zip.FileName causes the ZIP archive to be
    ; written to a new output file rather than overwriting
    ; the original ZIP archive.
    ; 
    $oZip.FileName = "qa_output/updatedExample.zip"

    ; Rewrite the ZIP archive.
    ; 
    ; The modified in-memory entry is compressed and written
    ; into the new ZIP archive.
    ; 
    $bSuccess = $oZip.WriteZip()
    If ($bSuccess = False) Then
        ConsoleWrite($oZip.LastErrorText & @CRLF)
        Exit
    EndIf

    ; After rewriting the ZIP archive, the entry again becomes
    ; a mapped entry:
    ; 
    ;     EntryType = 0
    ; 
    ConsoleWrite("EntryType after WriteZip = " & $oEntry.EntryType & @CRLF)
EndIf

$oZip.CloseZip 

ConsoleWrite("ZIP entry updated successfully." & @CRLF)