Extracting Files from Zip Entry to Memory

To extract a file from a zip to memory variable (for instance, a Byte array), use the following function. Make sure to add these Imports (Visual Basic)/using (C#) statements at the top of the code:

Private Function GetDataFromZipFile(zipFileName As String, entryName As String) As Byte()

' Get the entry from the zip file.

    Dim zip As New C1ZipFile()

    zip.Open(zipFileName)

    Dim ze As C1ZipEntry = zip.Entries(entryName)

' Copy the entry data into a memory stream.

    Dim ms As New MemoryStream()

    Dim buf(1000) As Byte

    Dim s As Stream = ze.OpenReader()

Try

While True

            Dim read As Integer = s.Read(buf, 0, buf.Length)

            If read = 0 Then

Exit While

End If

            ms.Write(buf, 0, read)

End While

Finally

        s.Dispose()

End Try

    s.Close()

' Return result.

    Return ms.ToArray()

End Function

private byte[] GetDataFromZipFile(string zipFileName, string entryName)

// Get the entry from the zip file.

    C1ZipFile zip = new C1ZipFile();

    zip.Open(zipFileName);

    C1ZipEntry ze = zip.Entries[entryName];

// Copy the entry data into a memory stream.

    MemoryStream ms = new MemoryStream();

    byte[] buf = new byte[1000];

    using (Stream s = ze.OpenReader())

        for (;;)

            int read = s.Read(buf, 0, buf.Length);

            if (read == 0) break;

            ms.Write(buf, 0, read);

// There's no need to call close because of the C# 'using'

// statement above but in VB this would be necessary.

    //s.Close();

// Return result.

    return ms.ToArray();