Convert HTML String to MHT

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Demonstrates how to convert an in-memory HTML string to a .mht file. The HTML includes an image that is loaded from the local filesystem.

        Dim mht As New Chilkat.Mht()
        mht.UnlockComponent("anything for 30-day trial")

        ' Convert HTML to MHT.  All referenced images are embedded in the MIME string
        ' returned.  Referenced images (or other items referenced from within the HTML)
        ' should be:
        ' (1) A URL
        ' (2) A file on the local system with an absolute pathname.
        ' (3) A file on the local system with a relative pathname that correctly resolves
        '     from the calling process' current working directory.
        Dim mhtStr As String
        mhtStr = mht.HtmlToMHT("<html><head><META http-equiv=""Content-Type"" content=""text/html; charset=iso-8859-7""></head><body>This is a test<br /><img src=""images/dude.gif"" /></body></html>")

        ' IMPORTANT: You do not want to write the .mht file in this way.  By doing so, the
        ' StreamWriter class writes the utf-8 preamble to the file.  When you try to open the .mht
        ' in Internet Explorer, it will load as a text file displaying the MIME source.
        Dim appendMode As Boolean = False ' This overwrites the entire file.
        Dim sw As New System.IO.StreamWriter("outBad.mht", appendMode, System.Text.Encoding.UTF8)
        sw.Write(mhtStr)
        sw.Close()

        ' Use this code to write the .mht instead.
        Dim sw2 As New System.IO.StreamWriter("outGood.mht", appendMode, System.Text.Encoding.ASCII)
        sw2.Write(mhtStr)
        sw2.Close()

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