(Lianja) 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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llSuccess = .F.

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

loZip = createobject("CkZip")

llSuccess = loZip.NewZip("c:/temp/sampleText.zip")
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

// Add a small text file from memory.
// The text is stored in the ZIP as "hello.txt".
llSuccess = loZip.AddString("hello.txt","Hello from a ZIP entry!","utf-8")
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

// Write the ZIP archive to disk and close it.
llSuccess = loZip.WriteZipAndClose()
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

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

loZip2 = createobject("CkZip")

llSuccess = loZip2.OpenZip("c:/temp/sampleText.zip")
if (llSuccess = .F.) then
    ? loZip2.LastErrorText
    release loZip
    release loZip2
    return
endif

// Get the text file entry.
loEntry = createobject("CkZipEntry")

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

if (llSuccess = .F.) then
    ? "Entry not found."
    release loZip
    release loZip2
    release loEntry
    return
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