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RPC_S_CALLPENDING
COM call is still pending
RPC_S_CALLPENDING is HRESULT 2147549461 (0x80010115) from winerror.h. The documented description is “OLE has sent a request and is waiting for a reply.” The value must be interpreted at OLE/COM call control while a request has been sent and the caller is awaiting a reply.
The call has not completed and remains outstanding rather than having failed.
Where the result appears
- This result may surface in OLE/COM call control while a request has been sent and the caller is awaiting a reply.
Typical causes and interpretation
Common cause categories are: the server is still processing; the STA must dispatch messages; a nested wait observes the outstanding call; network latency delays reply. The candidate causes are alternatives, so test one precondition at a time instead of applying several broad repairs together.
Key distinction: the call has not completed and remains outstanding rather than having failed.
Correct handling and recovery
The appropriate recovery is to continue through the documented wait or message-pump mechanism, honor cancellation, and avoid issuing a duplicate non-idempotent call.
Practical scenario
A UI STA waits for a document server and receives the pending status while its message loop continues dispatching incoming COM calls.
Difference from related HRESULTs
RPC_S_WAITONTIMER means COM is deliberately delaying before a retry; it means the original call remains outstanding.
References
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