Add an HTML Alternative Body to an Email

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Demonstrates the Chilkat Email.AddHtmlAlternativeBody method, which adds an HTML alternative body. Combined with a plain-text body, it produces a multipart/alternative email that offers both representations of the same content. This example sets a plain-text body, adds an HTML alternative, and prints the resulting alternative count.

Background: A well-formed HTML email usually ships two versions of the body: a rich HTML version and a plain-text fallback, wrapped in a multipart/alternative container. The receiving client displays whichever it prefers — modern clients show the HTML, while text-only clients (or spam filters and accessibility tools) use the plain text. Providing both improves deliverability and ensures every recipient can read the message.

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#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkEmail email;

    //  Demonstrates the AddHtmlAlternativeBody method, which adds an HTML alternative body to
    //  the email.  Combined with a plain-text body, this produces a multipart/alternative
    //  email that offers both representations.

    email = CkEmail_Create();
    CkEmail_putSubject(email,"Plain-text and HTML alternatives");

    //  Start with a plain-text body.
    CkEmail_SetTextBody(email,"This is the plain-text version of the message.","text/plain");

    //  Add an HTML alternative, creating a multipart/alternative email.
    CkEmail_AddHtmlAlternativeBody(email,"<html><body><b>This is the HTML version.</b></body></html>");

    printf("NumAlternatives = %d\n",CkEmail_getNumAlternatives(email));


    CkEmail_Dispose(email);

    }