PxMsgGetMetadata_Hnd()

Get the metadata of the message.

APPLIES TO

8.2.0

SYNOPSIS
PxMsgMetadata_t PxMsgGetMetadata_Hnd (PxMsg_t msgid);
ARGUMENTS






msgid




The message object

















ERROR CODES















PXERR_MSG_NOT_IMPLEMENTED




function is called by a system interrupt handler









DESCRIPTION










The PxMsgGetMetadata_Hnd returns the metadata of the message. The size of the metadata is 8 byte. This function should only be called from handlers running in a task’s context.






















IMPLEMENTATION GUIDELINES
















Before call






    

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    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:
    

    

      

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      PxMsgIdIsValid() must be true.
      

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      PxMsgIdGet() must not be _PXIllegalObjId.
      

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

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After call






    

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    PxMsgGetMetadata_Hnd returns a null value on failure (C).
    

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Best Practice






    

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    This function should be called from handlers only. (V)
    

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SEE ALSO











USAGE








#include "pxdef.h"

PxMsgMetadata_t MetaData = PxMsgGetMetaData_Hnd(msgid);