B4X Requires Chilkat v11.0.0+

Extract a Single ZIP Entry While Preserving Its Stored Path

See more Zip Examples

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.

B4X

Dim success As Boolean = False

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

Dim zip As ChilkatZip
zip.Initialize("zip")

success = zip.NewZip("c:/temp/sampleText.zip")
If success = False Then
    Log(zip.LastErrorText)
    Return
End If


'  Add a small text file from memory.
success = zip.AddString("myApp/docs/hello.txt", "Hello from a ZIP entry!", "utf-8")
If success = False Then
    Log(zip.LastErrorText)
    Return
End If


'  Write the ZIP archive to disk and close it.
success = zip.WriteZipAndClose
If success = False Then
    Log(zip.LastErrorText)
    Return
End If


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

Dim zip2 As ChilkatZip
zip2.Initialize("zip2")

success = zip2.OpenZip("c:/temp/sampleText.zip")
If success = False Then
    Log(zip2.LastErrorText)
    Return
End If


'  Find the entry by its stored ZIP path.
Dim entry As ChilkatZipEntry
entry.Initialize("entry")

success = zip2.EntryOf("myApp/docs/hello.txt", entry)

If success = False Then
    Log("Entry not found.")
    Return
End If


'  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.
success = entry.Extract("c:/temp/extracted")
If success = False Then
    Log(entry.LastErrorText)
    Return
End If


zip2.CloseZip

Log("Entry extracted successfully.")