(Visual Basic 6.0) 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
zu/Oxta1rb17a6UhAK0hAPe9rb2Ec7V7a71rUpwpCL0xCJwhAOfOxta9tcatpdallM6cjMaUhK1C
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--------------080707010302060306060800--

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim mime As New ChilkatMime

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

Dim success As Long
success = mime.LoadMimeFile("sampleMime2.txt")
If (success = 0) Then
    Debug.Print 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 ChilkatMime
Set 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 CkFileAccess
success = fac.WriteEntireFile("out1.gif",binaryData)
If (success <> 1) Then
    Debug.Print 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 = 0) Then
    Debug.Print part2.LastErrorText
    Exit Sub
End If

Debug.Print "Finished."