To write a multi part yEnc file to a existing stream use the EncodePartToStream function.
Returns True if it was successful, false if not. Use the LastError property to determine which error occured.
This function should only be used after a call to the BeginMultiPart function. (See the example project that comes with the plugin).
Always create a new instance of the YEncEncoder class for each file to encode.
Possible errors that this function can generate: