(Visual FoxPro) Get Compressed ZIP Entry Data as Base64 Using ZipEntry.CopyToBase64

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This example creates a small ZIP archive containing a text file added from memory, writes the ZIP to disk, re-opens it, and then uses ZipEntry.CopyToBase64 to retrieve the compressed data for the text file as a Base64-encoded string.

The Base64 string returned by CopyToBase64 represents the compressed bytes stored for the entry inside the ZIP archive. It is not the original uncompressed text data.

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

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LOCAL lnSuccess
LOCAL loZip
LOCAL loZip2
LOCAL loEntry
LOCAL lcB64

lnSuccess = 0

* ------------------------------------------------------------
* First create a sample ZIP archive containing a small text file.

loZip = CreateObject('Chilkat.Zip')

lnSuccess = loZip.NewZip("c:/temp/sampleText.zip")
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Add a small text file from memory.
* The text is stored in the ZIP as "hello.txt".
lnSuccess = loZip.AddString("hello.txt","Hello from a ZIP entry!","utf-8")
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* Write the ZIP archive to disk and close it.
lnSuccess = loZip.WriteZipAndClose()
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loZip
    CANCEL
ENDIF

* ------------------------------------------------------------
* Now open the ZIP archive we just created.

loZip2 = CreateObject('Chilkat.Zip')

lnSuccess = loZip2.OpenZip("c:/temp/sampleText.zip")
IF (lnSuccess = 0) THEN
    ? loZip2.LastErrorText
    RELEASE loZip
    RELEASE loZip2
    CANCEL
ENDIF

* Get the text file entry.
loEntry = CreateObject('Chilkat.ZipEntry')

lnSuccess = loZip2.EntryOf("hello.txt",loEntry)

IF (lnSuccess = 0) THEN
    ? "Entry not found."
    RELEASE loZip
    RELEASE loZip2
    RELEASE loEntry
    CANCEL
ENDIF

* Get the compressed ZIP entry data as Base64.
* 
* This is the compressed data stored inside the ZIP file,
* not the uncompressed text "Hello from a ZIP entry!".
lcB64 = loEntry.CopyToBase64()

? "Base64 compressed ZIP entry data:"
? lcB64

loZip2.CloseZip()

? "Done."

RELEASE loZip
RELEASE loZip2
RELEASE loEntry