(Visual FoxPro) 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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LOCAL lnSuccess
LOCAL loZip
LOCAL loZip2
LOCAL loEntry

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

* Find the entry by its stored ZIP path.
loEntry = CreateObject('Chilkat.ZipEntry')

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

IF (lnSuccess = 0) THEN
    ? "Entry not found."
    RELEASE loZip
    RELEASE loZip2
    RELEASE loEntry
    CANCEL
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.
lnSuccess = loEntry.Extract("c:/temp/extracted")
IF (lnSuccess = 0) THEN
    ? loEntry.LastErrorText
    RELEASE loZip
    RELEASE loZip2
    RELEASE loEntry
    CANCEL
ENDIF

loZip2.CloseZip()

? "Entry extracted successfully."

RELEASE loZip
RELEASE loZip2
RELEASE loEntry