Get a Header Field from an Alternative Body

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Demonstrates the Chilkat Email.GetAltHeaderField method, which returns the value of a header field within the Nth alternative body's MIME sub-part. The first argument is the zero-based alternative index; the second is the header field name. This example builds a message with plain-text and HTML alternatives and reads the Content-Type of the first alternative.

Background: A multipart/alternative message is a tree: each alternative body is its own MIME sub-part with its own little header block (Content-Type, Content-Transfer-Encoding, etc.). The top-level Email header methods read the message headers, whereas GetAltHeaderField reaches into a specific alternative's sub-part — useful for inspecting exactly how each representation is typed and encoded.

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#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkEmail email;
    const char *ct;

    //  Demonstrates the GetAltHeaderField method, which returns the value of a header field
    //  within the Nth alternative body's MIME sub-part.  The 1st argument is the zero-based
    //  alternative index; the 2nd is the header field name.

    email = CkEmail_Create();

    //  Create an email with plain-text and HTML alternatives.
    CkEmail_SetTextBody(email,"This is the plain-text alternative.","text/plain");
    CkEmail_AddHtmlAlternativeBody(email,"<html><body>This is the HTML alternative.</body></html>");

    //  Get the Content-Type header of the first alternative body (index 0).
    ct = CkEmail_getAltHeaderField(email,0,"Content-Type");
    printf("Alternative 0 Content-Type: %s\n",ct);


    CkEmail_Dispose(email);

    }