(Visual FoxPro) Merge ZIP Archives Using AppendZip

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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

LOCAL lnSuccess
LOCAL loZip

lnSuccess = 0

* --------------------------------------------------------------------------------
* Note: The AppendZip method is currently not working and will be fixed in v11.5.0
* --------------------------------------------------------------------------------
loZip = CreateObject('Chilkat.Zip')

lnSuccess = loZip.NewZip("merged.zip")
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Append all entries from reports.zip.
lnSuccess = loZip.AppendZip("c:/zips/reports.zip")
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Append all entries from images.zip.
lnSuccess = loZip.AppendZip("c:/zips/images.zip")
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Additional entries can still be added.
lnSuccess = loZip.AddString("readme.txt","Merged ZIP archive","utf-8")
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Write the final ZIP archive.
lnSuccess = loZip.WriteZipAndClose()
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

? "ZIP archive created successfully."

RELEASE loZip