(DataFlex) Merge ZIP Archives Using AppendZip

See more Zip Examples

This example demonstrates how to use the AppendZip method to append all entries from one ZIP archive into another ZIP archive.

The AppendZip method reads the entries from an existing ZIP file in the local filesystem and appends them to the current in-memory Zip object.

This is useful for:

• Merging multiple ZIP archives into a single ZIP
• Adding the contents of a previously created ZIP archive
• Building larger ZIP archives from smaller ZIP files

The appended entries are not written to the output ZIP until a Write* method is called.

Suppose the ZIP archive reports.zip contains:

reports/january.pdf
reports/february.pdf

And suppose the ZIP archive images.zip contains:

images/logo.png
images/banner.jpg

After calling AppendZip for both ZIP files and writing the final ZIP archive, the resulting ZIP will contain:

reports/january.pdf
reports/february.pdf
images/logo.png
images/banner.jpg

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

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoZip
    String sTemp1

    Move False To iSuccess

    // --------------------------------------------------------------------------------
    // Note: The AppendZip method is currently not working and will be fixed in v11.5.0
    // --------------------------------------------------------------------------------
    Get Create (RefClass(cComChilkatZip)) To hoZip
    If (Not(IsComObjectCreated(hoZip))) Begin
        Send CreateComObject of hoZip
    End

    Get ComNewZip Of hoZip "merged.zip" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Append all entries from reports.zip.
    Get ComAppendZip Of hoZip "c:/zips/reports.zip" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Append all entries from images.zip.
    Get ComAppendZip Of hoZip "c:/zips/images.zip" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Additional entries can still be added.
    Get ComAddString Of hoZip "readme.txt" "Merged ZIP archive" "utf-8" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Write the final ZIP archive.
    Get ComWriteZipAndClose Of hoZip To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "ZIP archive created successfully."


End_Procedure