3.17.4.1.31 Label (Opnum 37)
The Label method is received by the server in an RPC_REQUEST packet. In response, the server MUST set the represented Message.Label.
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[propput] HRESULT Label( [in] BSTR bstrLabel );
bstrLabel: A BSTR that contains the application-defined string description 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 bstrLabel input parameter ≥ 250 characters:
Return MQ_ERROR_LABEL_TOO_LONG (0xC00E005D), and take no further action.
Set the represented Message.Label to the value contained in the bstrLabel input parameter.