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(Delphi DLL) Add, Remove, Update MIME Header FieldsDemonstrates how to add, remove, or update the content of MIME header fields. Note: This example requires Chilkat v11.0.0 or greater.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Mime; ... procedure TForm1.Button1Click(Sender: TObject); var success: Boolean; mime: HCkMime; bAllOccurrences: Boolean; mpRelated: HCkMime; pJpg: HCkMime; begin success := False; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. mime := CkMime_Create(); // The contents of this MIME file are shown below, // and is also available at https://www.chilkatsoft.com/sampleMime.txt success := CkMime_LoadMimeFile(mime,'qa_data/mime/sampleMime.txt'); if (success = False) then begin Memo1.Lines.Add(CkMime__lastErrorText(mime)); Exit; end; // The MIME used in this example has the following nested structure // // multipart/alternative // text/plain // multipart/related // text/html // image/jpeg // // Adding a top-level MIME header is easy. CkMime_AddHeaderField(mime,'hello-world','Hello World!'); // If a header field of the same name already exists, the AddHeaderField // method adds a duplicate. CkMime_AddHeaderField(mime,'Subject','This is the 2nd Subject header.'); Memo1.Lines.Add(CkMime__getEntireHead(mime)); Memo1.Lines.Add('-'); // The top-level header now looks like this: // // Subject: Test email. // Content-Type: multipart/alternative; boundary="------------DB171738719FB06D67DEBAA0" // MIME-Version: 1.0 // hello-world: Hello World! // Subject: This is the 2nd Subject header. // // The RemoveHeaderField method can remove the 1st occurrance, or all occurrences. bAllOccurrences := True; // Remove all occurrences of the Subject header; CkMime_RemoveHeaderField(mime,'Subject',bAllOccurrences); Memo1.Lines.Add(CkMime__getEntireHead(mime)); Memo1.Lines.Add('-'); // After removing all Subject header fields, the top-level header now looks like this: // // Content-Type: multipart/alternative; boundary="------------DB171738719FB06D67DEBAA0" // MIME-Version: 1.0 // hello-world: Hello World! // // The content of a header field can be updated by calling SetHeaderField. // If the header field does not already exist, it is added. Otherwise it is updated. // Note: The order of header fields SHOULD never matter. CkMime_SetHeaderField(mime,'hello-world','Goodbye World.'); Memo1.Lines.Add(CkMime__getEntireHead(mime)); Memo1.Lines.Add('-'); // Now we have: // // Content-Type: multipart/alternative; boundary="------------DB171738719FB06D67DEBAA0" // MIME-Version: 1.0 // hello-world: Goodbye World. // // To add/update/delete header fields in sub-parts, navigate to // the sub-part and do the same.. mpRelated := CkMime_Create(); CkMime_PartAt(mime,1,mpRelated); pJpg := CkMime_Create(); CkMime_PartAt(mpRelated,1,pJpg); // Add a header to the image/jpeg sub-header. CkMime_SetHeaderField(pJpg,'CustomHeader','This is the custom header value.'); // View the entire MIME.. Memo1.Lines.Add(CkMime__getMime(mime)); // -------------------------------------------------------------- // -------------------------------------------------------------- // 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. <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-- // CkMime_Dispose(mime); CkMime_Dispose(mpRelated); CkMime_Dispose(pJpg); end; |
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