3.17.4.1.12 Priority (Opnum 18)
The Priority method is received by the server in an RPC_REQUEST packet. In response, the server MUST set the represented Message.Priority.
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[propput] HRESULT Priority( [in] long lPriority );
lPriority: A long integer that specifies the priority of the message.
Return Values: The method MUST return S_OK (0x00000000) on success or an implementation-specific error HRESULT on failure.
When processing this call, the server MUST follow these guidelines:
If the lPriority input parameter is NOT in the range 0 ≤ lPriority ≤ 7:
Return MQ_ERROR_ILLEGAL_PROPERTY_VALUE (0xC00E0018), and take no further action.
Set the represented Message.Priority to the value contained in the lPriority input parameter.