(VB.NET) 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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Dim success As Boolean = False

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

Dim zip As New Chilkat.Zip

success = zip.NewZip("c:/temp/sampleText.zip")
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
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
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


' Write the ZIP archive to disk and close it.
success = zip.WriteZipAndClose()
If (success = False) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


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

Dim zip2 As New Chilkat.Zip

success = zip2.OpenZip("c:/temp/sampleText.zip")
If (success = False) Then
    Debug.WriteLine(zip2.LastErrorText)
    Exit Sub
End If


' Find the entry by its stored ZIP path.
Dim entry As New Chilkat.ZipEntry

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

If (success = False) Then
    Debug.WriteLine("Entry not found.")
    Exit Sub
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
    Debug.WriteLine(entry.LastErrorText)
    Exit Sub
End If


zip2.CloseZip()

Debug.WriteLine("Entry extracted successfully.")