GetMessageDataPointer (FUN)

FUNCTION GetMessageDataPointer : POINTER TO CL2I.DATA

Returns pointer to the eight data bytes of a message. Number of valid bytes can be retrieved by GetMessageLength.

Note

The data is organised in the “Network Byte Order“ of the CANbus. The alignment of data types in the RTS memory may differ from the alignment in the data messages.

Example

VAR
  hMsg : CAA.HANDLE;
  pData : POINTER TO CL2I.DATA;
  usiMsgLen : USINT;
  byFirstByte : BYTE;
  bySecondByte : BYTE;
  eError : CL2.ERROR;
END_VAR

  IF hMsg <> CAA.gc_hINVALID THEN
    //Get message data pointer
    pData := CL2.GetMessageDataPointer(hMessage := hMsg, peError := ADR(eError));
    usiMsgLen := CL2.GetMessageLength(hMessage := hMsg, peError := ADR(eError)); //get number of valid bytes
    IF pData <> CAA.gc_pNULL THEN
        byFirstByte := pData^[0];
        bySecondByte := pData^[1];
    END_IF
END_IF

InOut:

Scope	Name	Type	Comment
Return	GetMessageDataPointer	POINTER TO CL2I.DATA	Pointer to message data
Input	hMessage	CAA.HANDLE	handle of message
Input	peError	POINTER TO ERROR	optional pointer to error enum