PxMsgGetMetadata()

Get the metadata of the message.

APPLIES TO

8.2.0

SYNOPSIS
PxMsgMetadata_t PxMsgGetMetadata (PxMsg_t msgid);
ARGUMENTS






msgid




The message object

















RETURN VALUES






    

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    Message metadata
    

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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_MSG_NOT_IMPLEMENTED




The function is called by a system interrupt handler









DESCRIPTION










The PxMsgGetMetadata function returns the metadata of the message. The size of the metadata is 8 byte. This function should only be called from task (not from handler).






















IMPLEMENTATION GUIDELINES
















Before call






    

  • 

    msgid must be a valid message object, requested via PxMsgRequest…​ or PxMsgEnvelop…​ or received by a PxMsgReceive…​ call (V). This message object 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






    

  • 

    PxMsgGetMetadata returns a null value on failure (C). In this case the task must call PxGetError to check which error has occurred (F).
    

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Best Practice






    

  • 

    No restrictions.
    

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SEE ALSO











USAGE








#include "pxdef.h"

PxMsgMetadata_t MetaData = PxMsgGetMetaData(msgid);