PxMsgGetData()

Get data area of a message (task service).

APPLIES TO

8.2.0

SYNOPSIS
PxMsgData_t PxMsgGetData (PxMsg_t msgid);
ARGUMENTS






msgid




Message object

















RETURN VALUES






    

  • 

    Pointer to message data area
    

    • 







ERROR CODES















PXERR_MSG_ILLMSG




msgid is not a valid message object








PXERR_MSG_ILLUSER




The calling task is not user of this message








PXERR_PROT_NOFREE_ENTRY




No free protection entry








PXERR_PROT_ILL_HANDLE




The associated protection handle is not valid








PXERR_REQUEST_INVALID_PARAMETER




Invalid pair parameter








PXERR_MSG_NOT_IMPLEMENTED




The function is called by a system interrupt handler









DESCRIPTION










PxMsgGetData returns a C-pointer to the data area corresponding to message msgid. If an invalid message is given a null pointer is returned. PxMsgGetData function can only be called from task, othewise PXERR_TASK_ILLCALL error is returned.






















IMPLEMENTATION GUIDELINES
















Before call






    

  • 

    msgid must be a valid message object, requested via PxMsgRequest…​ or PxMsgEnvelop…​ or received by a PxMsgReceive…​ call (V). This id may be checked with one of the following macros:
    

    

      

    • 

      PxMsgIdIsValid() must be true.
      

      • 

    • 

      PxMsgIdGet() must not be _PXIllegalObjId.
      

      • 

    • 

      PxMsgIdError() must be PXERR_NOERROR otherwise the returned error code has to be interpreted (C).
      

      • 

    

    

    • 



















After call






    

  • 

    PxMsgGetData returns a null pointer on failure (C).
    

    • 



















Best Practice






    

  • 

    No restrictions.
    

    • 






























SEE ALSO











USAGE








#include "pxdef.h"

PxMsgData_t DataArea = PxMsgGetData(msgid)

if (DataArea != NULL) {
    // Handle data
}
else {
    // Report error
}