Unicode C
Send HTML Email with External CSS as Related Item

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by CID (Content-ID).
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#include <C_CkMailManW.h>
#include <C_CkEmailW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMailManW mailman;
    HCkEmailW email;
    HCkStringBuilderW sbCss;
    BOOL bCrlf;
    const wchar_t *filenameInHtml;
    const wchar_t *contentIdCss;
    HCkStringBuilderW sbHtml;
    int numReplacements;

    success = FALSE;

    // 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.
    mailman = CkMailManW_Create();

    // Use your SMTP server hostname.  This example uses office365, but it could be any SMTP server..
    CkMailManW_putSmtpHost(mailman,L"outlook.office365.com");
    CkMailManW_putSmtpPort(mailman,587);
    CkMailManW_putStartTLS(mailman,TRUE);

    // Set the SMTP login/password
    CkMailManW_putSmtpUsername(mailman,L"OFFICE365-SMTP-LOGIN");
    CkMailManW_putSmtpPassword(mailman,L"OFFICE365-SMTP-PASSWORD");

    // Create a new email object
    email = CkEmailW_Create();
    CkEmailW_putSubject(email,L"HTML Email with embedded CSS");
    CkEmailW_putFrom(email,L"Chilkat Support <my-office365-user@mydomain.com>");
    CkEmailW_AddTo(email,L"Chilkat Support",L"support@chilkatsoft.com");

    sbCss = CkStringBuilderW_Create();
    bCrlf = TRUE;
    CkStringBuilderW_AppendLine(sbCss,L"body {",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"    background-color: powderblue;",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"}",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"h1 {",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"    color: blue;",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"}",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"p {",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"    color: red;",bCrlf);
    CkStringBuilderW_AppendLine(sbCss,L"}",bCrlf);

    // It's possible to add a CSS file directly by calling AddRelatedFile.
    // This example will add the CSS from a string.
    filenameInHtml = L"styles.css";
    contentIdCss = CkEmailW_addRelatedString(email,filenameInHtml,CkStringBuilderW_getAsString(sbCss),L"utf-8");
    if (CkEmailW_getLastMethodSuccess(email) != TRUE) {
        wprintf(L"%s\n",CkEmailW_lastErrorText(email));
        CkMailManW_Dispose(mailman);
        CkEmailW_Dispose(email);
        CkStringBuilderW_Dispose(sbCss);
        return;
    }

    // The src attribute for the image tag is set to the contentIdCss:
    sbHtml = CkStringBuilderW_Create();
    CkStringBuilderW_AppendLine(sbHtml,L"<!DOCTYPE html>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"<html>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"<head>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"  <link rel=\"stylesheet\" href=\"cid:CONTENT_ID_CSS\">",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"</head>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"<body>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"<h1>This is a heading</h1>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"<p>This is a paragraph.</p>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"</body>",bCrlf);
    CkStringBuilderW_AppendLine(sbHtml,L"</html>",bCrlf);

    numReplacements = CkStringBuilderW_Replace(sbHtml,L"CONTENT_ID_CSS",contentIdCss);

    CkEmailW_SetHtmlBody(email,CkStringBuilderW_getAsString(sbHtml));

    success = CkMailManW_SendEmail(mailman,email);
    if (success != TRUE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
    }
    else {
        wprintf(L"Mail Sent!\n");
    }



    CkMailManW_Dispose(mailman);
    CkEmailW_Dispose(email);
    CkStringBuilderW_Dispose(sbCss);
    CkStringBuilderW_Dispose(sbHtml);

    }