B4X

Save All MIME Attachments to Files

Demonstrates the Chilkat Mime.PartsToFiles method, which recursively traverses the MIME tree and saves each part having a nonempty filename parameter to a directory. The first argument is the destination directory and the second is a StringTable that receives the saved filenames.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This extracts every named attachment from a message in one call, walking the whole tree so it finds attachments nested inside multipart containers. It saves only parts that declare a filename — inline body parts without one are skipped — and reports what it wrote via the StringTable, which is handy for logging or follow-up processing. The destination directory must already exist.

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Dim success As Boolean = False

Dim mime As ChilkatMime
mime.Initialize
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


'  Recursively traverse the MIME tree and save each part that has a nonempty "filename" parameter
'  to a directory.  The 1st argument is the destination directory and the 2nd is a StringTable
'  that receives the saved filenames.
Dim savedFiles As ChilkatStringTable
savedFiles.Initialize
success = mime.PartsToFiles("qa_output/attachments", savedFiles)
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Dim n As Int = savedFiles.Count
Log("Saved " & n & " files:")
Dim i As Int
For i = 0 To n - 1
    Dim name As String = savedFiles.StringAt(i)
    If savedFiles.LastMethodSuccess = False Then
        Log(savedFiles.LastErrorText)
        Return
    End If

    Log(name)
Next