(VB.NET UWP/WinRT) Parse MIME to get Binary Data (such as GIF, JPG, or any binary file)

Demonstrates how to parse a MIME to get binary data. This example extracts the image data for a GIF image to an in-memory byte array, and also to a file.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
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--------------080707010302060306060800--

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim mime As New Chilkat.Mime

' Load the sampleMime2.txt file into the MIME object.
' (This file is available at http://www.chilkatsoft.com/testData/sampleMime2.txt )

Dim success As Boolean = mime.LoadMimeFile("sampleMime2.txt")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


' The GIF image is the 2nd sub-part located directly under the
' top-level MIME node.  Indexing begins at 0, therefore the 2nd
' sub-part is at index 1.
Dim part2 As Chilkat.Mime
part2 = mime.GetPart(1)

Dim binaryData() As Byte

' The GetBodyBinary method returns the binary bytes
' of the part's body, automatically decoded from whatever
' content-transfer-encoding might be used (such as base64).
binaryData = part2.GetBodyBinary()

' We now have the binary bytes of the GIF image in binaryData.
' Save it to a file.
Dim fac As New Chilkat.FileAccess
success = fac.WriteEntireFile("out1.gif",binaryData)
If (success <> True) Then
    Debug.WriteLine(fac.LastErrorText)
    Exit Sub
End If


' An easier way to save the body content to a file,
' assuming your application does not need to access
' the binary data in-memory, is to call SaveBody
success = part2.SaveBody("out2.gif")
If (success = False) Then
    Debug.WriteLine(part2.LastErrorText)
    Exit Sub
End If




Debug.WriteLine("Finished.")