(Delphi ActiveX) Convert MIME to XML

Demonstrates how to convert MIME to XML, and how to access the MIME parts and data from XML.

Chilkat for Delphi Downloads

Chilkat ActiveX DLL for Delphi

Chilkat non-ActiveX DLL for Delphi

* The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mime: TChilkatMime;
success: Integer;
xmlStr: WideString;
xml: TChilkatXml;
htmlContent: WideString;
notUsed: WideString;
jpgBytes: Array of Byte;

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

mime := TChilkatMime.Create(Self);

// The contents of this MIME file are shown below, 
// and is also available at https://www.chilkatsoft.com/sampleMime.txt
success := mime.LoadMimeFile('qa_data/mime/sampleMime.txt');
if (success <> 1) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

// The MIME used in this example has the following nested structure
// 
// multipart/alternative
//     text/plain
//     multipart/related
//         text/html
//         image/jpeg
// 

// Convert to XML.
xmlStr := mime.GetXml();

// Load into a Chilkat XML object so we can emit in indented format.
// (and also to demonstrate how to access the MIME content from XML).
xml := TChilkatXml.Create(Self);
xml.LoadXml(xmlStr);
// The XML emitted by this statement is shown below, following the remainder of sample code.
Memo1.Lines.Add(xml.GetXml());

// To get the top-level Subject header field:
Memo1.Lines.Add('Subject = ' + xml.ChilkatPath('header|subject|*'));

// Another way of getting the Subject:
xml.FirstChild2();
Memo1.Lines.Add('Subject = ' + xml.GetChildContent('subject'));
xml.GetRoot2();

// Using the Chilkat XML API, there are many different ways of accomplishing a goal.
// This example shows only a few possibilities...

// Let's go to the <body> tag containing the HTML.
// First we find the XML node where the content-type is text/html.
// (XML methods ending in "2" update the internal reference to the XML node.)
success := xml.SearchForContent2(xml.ControlInterface,'content-type','text/html');
if (success = 1) then
  begin
    // From this point, we know the HTML content is two levels up (to the <mime_message> node),
    // and one level down (to the <body> node).  We can get the HTML content from here:
    htmlContent := xml.ChilkatPath('..|..|body|*');
    Memo1.Lines.Add(htmlContent);
    Memo1.Lines.Add('-');
  end;

// Back to the root...
xml.GetRoot2();

// How to iterate over all image/jpeg bodies and access the bytes of each?
success := xml.SearchForContent2(xml.ControlInterface,'content-type','image/jpeg');
while success = 1 do
  begin
    // "$" in the Chilkat path indicates to update the internal reference of the caller
    // if the path could be traversed.
    notUsed := xml.ChilkatPath('..|..|body|$');
    if (xml.LastMethodSuccess = 1) then
      begin

        jpgBytes := xml.GetBinaryContent(0,0,'');

        Memo1.Lines.Add('Found JPG image!');

        // Find the next JPG image.
        success := xml.SearchForContent2(xml.ControlInterface,'content-type','image/jpeg');
      end
    else
      begin
        success := 0;
      end;
  end;

// --------------------------------------------------------------
// --------------------------------------------------------------
// The MIME converted to XML:

// <?xml version="1.0" encoding="utf-8" ?>
// <mime_message>
//     <header>
//         <subject>Test email.</subject>
//         <content-type boundary="------------DB171738719FB06D67DEBAA0">multipart/alternative</content-type>
//         <mime-version>1.0</mime-version>
//     </header>
//     <body>
//         <subpart>
//             <mime_message>
//                 <header>
//                     <content-type charset="utf-8" format="flowed">text/plain</content-type>
//                     <content-transfer-encoding>7bit</content-transfer-encoding>
//                 </header>
//                 <body><![CDATA[This is a test.
// ]]></body>
//             </mime_message>
//         </subpart>
//         <subpart>
//             <mime_message>
//                 <header>
//                     <content-type boundary="------------A940F1230E6F0105F03DB2CB">multipart/related</content-type>
//                 </header>
//                 <body>
//                     <subpart>
//                         <mime_message>
//                             <header>
//                                 <content-type charset="utf-8">text/html</content-type>
//                                 <content-transfer-encoding>8bit</content-transfer-encoding>
//                             </header>
//                             <body><![CDATA[<html><head>
// <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
//   </head>
//   <body bgcolor="#FFFFFF" text="#000000">
//     <p>This is a test.&nbsp; <img src="cid:part1.E16AE3B4.1505C436@chilkatsoft.com" height="20" width="20"></p>
//   </body>
// </html>
// ]]></body>
//                         </mime_message>
//                     </subpart>
//                     <subpart>
//                         <mime_message>
//                             <header>
//                                 <content-type name="starfish20.jpg">image/jpeg</content-type>
//                                 <content-transfer-encoding>base64</content-transfer-encoding>
//                                 <content-id>&lt;part1.E16AE3B4.1505C436@chilkatsoft.com&gt;</content-id>
//                                 <content-disposition filename="starfish20.jpg">inline</content-disposition>
//                             </header>
//                             <body>/9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
// NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
// YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
// Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
// AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
// NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
// pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
// Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
// enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
// xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
// DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
// AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
// QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
// EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==</body>
//                         </mime_message>
//                     </subpart>
//                 </body>
//             </mime_message>
//         </subpart>
//     </body>
// </mime_message>
// 

// --------------------------------------------------------------
// --------------------------------------------------------------
// The MIME sample file loaded at the beginning of this example
// contains the following MIME:

// Subject: Test email.
// Content-Type: multipart/alternative;
// 	boundary="------------DB171738719FB06D67DEBAA0"
// MIME-Version: 1.0
// 
// --------------DB171738719FB06D67DEBAA0
// Content-Type: text/plain; charset="utf-8"; format=flowed
// Content-Transfer-Encoding: 7bit
// 
// This is a test.
// 
// --------------DB171738719FB06D67DEBAA0
// Content-Type: multipart/related;
// 	boundary="------------A940F1230E6F0105F03DB2CB"
// 
// --------------A940F1230E6F0105F03DB2CB
// Content-Type: text/html; charset="utf-8"
// Content-Transfer-Encoding: 8bit
// 
// <html><head>
// <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
//   </head>
//   <body bgcolor="#FFFFFF" text="#000000">
//     <p>This is a test.&nbsp; <img src="cid:part1.E16AE3B4.1505C436@chilkatsoft.com" height="20" width="20"></p>
//   </body>
// </html>
// 
// --------------A940F1230E6F0105F03DB2CB
// Content-Type: image/jpeg; name="starfish20.jpg"
// Content-Transfer-Encoding: base64
// Content-ID: <part1.E16AE3B4.1505C436@chilkatsoft.com>
// Content-Disposition: inline; filename="starfish20.jpg"
// 
// /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
// NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
// YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
// Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
// AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
// NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
// pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
// Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
// enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
// xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
// DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
// AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
// QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
// EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
// 
// --------------A940F1230E6F0105F03DB2CB--
// 
// --------------DB171738719FB06D67DEBAA0--
// 
end;