Return Parameters
Byte Definition
Standard Enhanced  
5–6 11–12 Function number of the completed asynchronous function (126 or 127). (returned)
7–10 13–16 Address of the data string of the completed asynchronous function call. (The application must not reuse the data string until the request has completed). (returned)
11–12 17–20 Length of the data string of the completed asynchronous function call. (returned)
13–14 21–24 Return code of the completed asynchronous function call. (returned)
Return Code Explanation
0 The Get Request Completion function was successful.
2 An error was made in specifying parameters.
9 A system error was encountered.
38 Requested function was not complete.
42 No matching request was found.
There are some differences between return codes 38 and 42:
  1. Return code 38
    1. If a specific request ID and session were requested, both the session and ID were found but the request is pending (not in a completed state).
    2. If a zero request ID and a specific session were requested, the specified session has pending requests, but they are not satisfied (complete).
    3. If a zero request ID and a blank session were requested, pending requests were found but none were satisfied (complete).
  2. Return code 42
    1. If a specific request ID and session were requested, the specific request ID was not found in either a pending or a completed state.
    2. If a zero request ID and a specific session were requested, the specific session contains no pending or completed requests.
    3. If a zero request ID and a blank session were requested, no pending or completed requests were found.