(Lianja) Extract a Single ZIP Entry While Preserving Its Stored Path

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This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

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.
llSuccess = loZip.AddString("myApp/docs/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

// Find the entry by its stored ZIP path.
loEntry = createobject("CkZipEntry")

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

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

// Extract this single entry to the base directory:
// 
//     c:/temp/extracted
// 
// Because the entry's stored path is:
// 
//     myApp/docs/hello.txt
// 
// the file will be extracted to:
// 
//     qa_output/extracted/myApp/docs/hello.txt
// 
// The required subdirectories are created automatically.
llSuccess = loEntry.Extract("c:/temp/extracted")
if (llSuccess = .F.) then
    ? loEntry.LastErrorText
    release loZip
    release loZip2
    release loEntry
    return
endif

loZip2.CloseZip()

? "Entry extracted successfully."


release loZip
release loZip2
release loEntry