DosQueryQueue

This call determines the number of elements in a queue.

DosQueryQueue

(QueueHandle, NumberElements)

QueueHandle (HQUEUE) - input

Handle of the queue to find size.
NumberElements (PUSHORT) - output
Address of the number of entries in the queue waiting to be processed.

rc (USHORT) - return

Return code descriptions are:
• NO_ERROR 337
  ERROR_QUE_INVALID_HANDLE
  Remarks

  Any thread of a process that has access to the queue (because of a DosCreateQueue or a DosOpenQueue request) may issue DosQueryQueue to determine the number of elements currently in the queue.

  If the process that created the queue closes it before this request is issued, ERROR_QUE_INVALID_HANDLE is returned.

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