(DataFlex) Iterate MIME Parts of an Email

Demonstrates how to iterate over the MIME sub-parts of an email, and retrieve the content of each MIME sub-part body.

Note: This example requires some new features added to Chilkat v9.5.0.95.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoEmail
    Boolean iSuccess
    Handle hoSbContentType
    Boolean iCaseSensitive
    Boolean iInlineOnly
    Boolean iExcludeAttachments
    String sSearchSpec
    Integer iNumParts
    Integer i
    String sTextBody
    Handle hoAttachedEmail
    Variant vBdMime
    Handle hoBdMime
    Variant vBd
    Handle hoBd
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    // See the following Chilkat post to Quickly Understand Email MIME

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End

    Get ComLoadEml Of hoEmail "qa_data/eml/sample.eml" To iSuccess
    If (iSuccess = False) Begin
        Showln "Failed to load .eml"
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbContentType
    If (Not(IsComObjectCreated(hoSbContentType))) Begin
        Send CreateComObject of hoSbContentType
    End
    Move False To iCaseSensitive

    // Get the total number of non-multipart MIME sub-parts.
    // (This is a simple way of iterating over all the MIME leaf parts regardless of the MIME tree structure)
    Move False To iInlineOnly
    Move False To iExcludeAttachments
    Move "*/*" To sSearchSpec

    Get ComGetNumPartsOfType Of hoEmail sSearchSpec iInlineOnly iExcludeAttachments To iNumParts
    Move 0 To i
    While (i < iNumParts)
        // What is the Content-Type of this MIME part?
        Get ComGetNthContentType Of hoEmail i sSearchSpec iInlineOnly iExcludeAttachments To sTemp1
        Get ComAppend Of hoSbContentType sTemp1 To iSuccess
        Get ComStartsWith Of hoSbContentType "text/" iCaseSensitive To bTemp1
        If (bTemp1 = True) Begin
            // Get the text body of this MIME part.
            Get ComGetNthTextPartOfType Of hoEmail i sSearchSpec iInlineOnly iExcludeAttachments To sTextBody
            Get ComGetAsString Of hoSbContentType To sTemp1
            Showln "Got text body for " sTemp1
        End
        Else Begin
            Get ComContentsEqual Of hoSbContentType "message/rfc822" iCaseSensitive To bTemp1
            If (bTemp1 = True) Begin
                // If the Content-Type is message/rfc822, then the MIME body for this part contains a full embedded MIME messages.
                // Your application could load it into a Chilkat email object and recursively process...
                Get Create (RefClass(cComChilkatEmail)) To hoAttachedEmail
                If (Not(IsComObjectCreated(hoAttachedEmail))) Begin
                    Send CreateComObject of hoAttachedEmail
                End
                Get Create (RefClass(cComChilkatBinData)) To hoBdMime
                If (Not(IsComObjectCreated(hoBdMime))) Begin
                    Send CreateComObject of hoBdMime
                End
                Get pvComObject of hoBdMime to vBdMime
                Get ComGetNthBinaryPartOfTypeBd Of hoEmail i sSearchSpec iInlineOnly iExcludeAttachments vBdMime To iSuccess
                Get pvComObject of hoBdMime to vBdMime
                Get ComSetFromMimeBd Of hoAttachedEmail vBdMime To iSuccess
                // Now your app can recursively process the attachedEmail...
            End
            Else Begin
                // Get the bytes of this MIME body part.
                Get Create (RefClass(cComChilkatBinData)) To hoBd
                If (Not(IsComObjectCreated(hoBd))) Begin
                    Send CreateComObject of hoBd
                End
                Get pvComObject of hoBd to vBd
                Get ComGetNthBinaryPartOfTypeBd Of hoEmail i sSearchSpec iInlineOnly iExcludeAttachments vBd To iSuccess
                Get ComGetAsString Of hoSbContentType To sTemp1
                Get ComNumBytes Of hoBd To iTemp1
                Showln "Got binary body for " sTemp1 " numBytes = " iTemp1
            End

        End

        Send ComClear To hoSbContentType
        Move (i + 1) To i
    Loop



End_Procedure