TIdStack.WriteChecksum Method

Specifies the mechanism used to write a CRC checksum value for data included in a packet transmission.

Pascal

procedure WriteChecksum(
    s: TIdStackSocketHandle; 
    var VBuffer: TIdBytes; 
    const AOffset: Integer; 
    const AIP: String; 
    const APort: Integer; 
    const AIPVersion: TIdIPVersion = ID_DEFAULT_IP_VERSION
); virtual; abstract;

Parameters

Parameters	Description
s	Socket handle for the operation.
VBuffer	Data send in the packet transmission.
AOffset	Initial offset into the data to send in the packet transmission.
AIP	IP address for the endpoint of the packet transmission.
APort	Port number for the endpoint of the packet transmission.
AIPVersion	IP Address family supported for transmission on the specified socket. Default value is ID_DEFAULT_IP_VERSION.

Description

WriteChecksum is an abstract virtual method that specifies the mechanism used to Write a CRC checksum value for data included in a packet transmission on the specified socket handle.

WriteChecksum must be overridden and implemented in a descendant class that provides access to the specific capablities of the protocol stack for the operating system or platform hosting the Indy library.

Use CalcCheckSum to perform calculation of the CRC checksum value written in the method.