(C++) Send HTML Email with CSS as Related Item using Content-Location

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by Content-Location.

Some email clients display embedded (related) content best using CID's (Content-IDs), whereas other email clients display related content best by Content-Location. The choice you make may depend on the software used by the intended recipient of your email. (Does' the recipient read email on an iPhone? Android? Outlook? GMail? Thunderbird? etc.)

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#include <CkMailMan.h>
#include <CkEmail.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // The mailman object is used for sending and receiving email.
    CkMailMan mailman;

    // Use your SMTP server hostname.  This example uses office365, but it could be any SMTP server..
    mailman.put_SmtpHost("outlook.office365.com");
    mailman.put_SmtpPort(587);
    mailman.put_StartTLS(true);

    // Set the SMTP login/password
    mailman.put_SmtpUsername("OFFICE365-SMTP-LOGIN");
    mailman.put_SmtpPassword("OFFICE365-SMTP-PASSWORD");

    // Create a new email object
    CkEmail email;
    email.put_Subject("HTML Email with embedded CSS");
    email.put_From("Chilkat Support <my-office365-user@mydomain.com>");
    email.AddTo("Chilkat Support","support@chilkatsoft.com");

    CkStringBuilder sbCss;
    bool bCrlf = true;
    sbCss.AppendLine("body {",bCrlf);
    sbCss.AppendLine("    background-color: powderblue;",bCrlf);
    sbCss.AppendLine("}",bCrlf);
    sbCss.AppendLine("h1 {",bCrlf);
    sbCss.AppendLine("    color: blue;",bCrlf);
    sbCss.AppendLine("}",bCrlf);
    sbCss.AppendLine("p {",bCrlf);
    sbCss.AppendLine("    color: red;",bCrlf);
    sbCss.AppendLine("}",bCrlf);

    // The filenameInHtml is what should exists within the HTML (in the href atribute)
    const char *filenameInHtml = "styles.css";
    // Call AddRelatedString2 to use Content-Location.
    email.AddRelatedString2(filenameInHtml,sbCss.getAsString(),"utf-8");

    CkStringBuilder sbHtml;
    sbHtml.AppendLine("<!DOCTYPE html>",bCrlf);
    sbHtml.AppendLine("<html>",bCrlf);
    sbHtml.AppendLine("<head>",bCrlf);
    sbHtml.AppendLine("  <link rel=\"stylesheet\" href=\"styles.css\">",bCrlf);
    sbHtml.AppendLine("</head>",bCrlf);
    sbHtml.AppendLine("<body>",bCrlf);
    sbHtml.AppendLine("",bCrlf);
    sbHtml.AppendLine("<h1>This is a heading</h1>",bCrlf);
    sbHtml.AppendLine("<p>This is a paragraph.</p>",bCrlf);
    sbHtml.AppendLine("",bCrlf);
    sbHtml.AppendLine("</body>",bCrlf);
    sbHtml.AppendLine("</html>",bCrlf);

    email.SetHtmlBody(sbHtml.getAsString());

    bool success = mailman.SendEmail(email);
    if (success != true) {
        std::cout << mailman.lastErrorText() << "\r\n";
    }
    else {
        std::cout << "Mail Sent!" << "\r\n";
    }
    }