C++

Remove a Header Field from an Email

Demonstrates the Chilkat Email.RemoveHeaderField method, which removes by name all occurrences of a header field. Header-field names are case-insensitive, and every repeated occurrence with the given name is removed. This example adds a custom header, then removes it.

Background: Editing a message sometimes means deleting a header outright — stripping a tracking header, removing an X- flag before forwarding, or clearing a stale field before re-sending. Because a field name can appear more than once (like Received), RemoveHeaderField removes all matching occurrences in one call rather than just the first.

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C++

#include <CkEmail.h>

void ChilkatSample(void)
    {
    //  Demonstrates the RemoveHeaderField method, which removes by name all occurrences of a
    //  header field.  Header-field names are case-insensitive.

    CkEmail email;
    email.put_Subject("Remove header field");
    email.put_From("alice@example.com");

    email.AddHeaderField("X-Custom-Header","some value");

    //  Use HasHeaderMatching to test for the header's presence.  ("*" matches any value.)
    bool hasBefore = email.HasHeaderMatching("X-Custom-Header","*",false);
    std::cout << "Has X-Custom-Header before: " << hasBefore << "\r\n";

    //  Remove all occurrences of the header field.
    email.RemoveHeaderField("X-Custom-Header");

    bool hasAfter = email.HasHeaderMatching("X-Custom-Header","*",false);
    std::cout << "Has X-Custom-Header after: " << hasAfter << "\r\n";
    }