IdCoder

TIdEncoder is a TIdBaseComponent descendant that is the ancestor for Indy classes that perform encoding operations on String- or Stream-based values, and returns the encoded value as a String value. 

Descendants of TIdEncoder include TIdEncoder3to4 and TIdEncoderQuotedPrintable. 

Applications do not normally create instances of TIdEncoder, and instead use one of the descendant classes that implements a specific encoding algorithm. TIdEncoder can be used an as ancestor for classes that utilize a unique encoding algorithm and also adhere to the Indy coder framework.

TIdBaseComponent 

TIdEncoder3to4 

TIdEncoderQuotedPrintable