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WININET_E_NO_CALLBACK
WININET_E_NO_CALLBACK is a WinINet HRESULT. It means that the operation requires a status callback but no callback function is registered for the relevant Internet handle.
Diagnostic discriminator: Record the parent Internet handle mode, asynchronous flags, and callback registration before starting the operation. The same request succeeding after registering the required callback isolates handle configuration; endpoint and proxy changes are irrelevant.
What to check for WININET_E_NO_CALLBACK
- Register a valid status callback before starting the asynchronous operation that requires it.
- Keep callback-related state alive until all associated requests have completed or been cancelled.
- Avoid mixing an asynchronous handle configuration with code that assumes all operations complete synchronously.
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