Delphi DLL

Q-Encode a String for MIME Headers

Demonstrates the Chilkat Email.QEncodeString method, which converts the Unicode string in the first argument to the charset named in the second argument, Q-encodes the resulting multibyte data, and returns the encoded string. This is one of the representations used for non-ASCII text in MIME header fields.

Background: RFC 2047 defines two "encoded-word" schemes for putting non-ASCII text in headers: B (Base64) and Q (quoted-printable-style). Q-encoding leaves plain ASCII mostly readable and escapes only the special bytes, producing output like =?utf-8?Q?Caf=C3=A9?=. It is the better choice when text is mostly ASCII with a few accented characters, whereas B-encoding (BEncodeString) is more compact when most characters are non-ASCII.

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Delphi DLL

var
email: HCkEmail;
encoded: PWideChar;

begin
//  Demonstrates the QEncodeString method, which converts a Unicode string to a specified
//  charset, Q-encodes (RFC 2047) the resulting bytes, and returns the encoded string.
//  This is one of the forms used for non-ASCII text in MIME header fields.

email := CkEmail_Create();

//  Q-encode a Unicode string using the utf-8 charset.
encoded := CkEmail__qEncodeString(email,'Cafe Meeting Notes','utf-8');

Memo1.Lines.Add('Q-encoded: ' + encoded);

CkEmail_Dispose(email);