(Visual FoxPro) Append Files to Existing Zip w/out Rewriting Entire Zip

Demonstrates how to use the QuickAppend method to append files to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive. Note: The QuickAppend method is new and available in the pre-release downloads, or in official releases dated after 6-October-2007.

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

LOCAL loZip
LOCAL lnSuccess
LOCAL lnSaveExtraPath

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Zip')
loZip = CreateObject('Chilkat.Zip')

* The NewZip method only initializes the Zip object -- it does
* not create or write a .zip file.
lnSuccess = loZip.NewZip("notUsed.zip")
IF (lnSuccess <> 1) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Add a reference to a file.  This is the file that will
* be added to a pre-existing .zip archive.  
* Note: this does not read or compress the file contents --
* it simply adds a reference to the zip object.
lnSaveExtraPath = 0
lnSuccess = loZip.AppendOneFileOrDir("something.dat",lnSaveExtraPath)
IF (lnSuccess <> 1) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Appends the contents of the zip object to the preExisting.zip
* zip archive.  preExisting.zip is opened, and the files
* referenced by this zip object are streamed in, compressed,
* and appended to the end of the archive.
lnSuccess = loZip.QuickAppend("preExisting.zip")
IF (lnSuccess <> 1) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

? "Success!"

* Note: Additional files, directory trees, or in-memory data
* can be appended by calling AppendOneFileOrDir, AppendFiles,
* AppendString, AppendData, etc. multiple times.
* Whatever files and/or in-memory data that are referenced by
* this zip object will be appended to preExisting.zip when
* QuickAppend is called

RELEASE loZip