Topic Path: Symbol Reference > Classes > TIdMessageDecoderInfoMIME Class > TIdMessageDecoderInfoMIME Methods > CheckForStart Method
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TIdMessageDecoderInfoMIME.CheckForStart Method

Detects a MIME boundary and creates a decoder class for the associated document.

function CheckForStart(
    ASender: TIdMessage; 
    const ALine: string
): TIdMessageDecoder; override;
Parameters 
Description 
ASender 
Message to associate with a decoder class.
 
ALine 
Line from a message header to check for a MIME boundary. 

TIdMessageDecoder - Decoder class instance for the message.

CheckForStart is an overridden TIdMessageDecoder function in TIdMessageDecoderInfoMIME that is used to create a decoder for MIME message parts. 

CheckForStart will create a decoder instance for the message in ASender when the MIME boundary marker in ASender is detected in ALine, or when ASender has an empty MIMEBoundary and the ContentTransferEncoding is 'base64' or 'quoted-printable'. 

Under all other conditions, the return value for the method is Nil.

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