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SCARD_E_READER_UNAVAILABLE
SCARD_E_READER_UNAVAILABLE The named reader is known to the smart-card subsystem but is not currently available for use. The reader may have been disconnected, suspended, reserved, or left in an unusable driver state.
What to check
- Enumerate readers again and compare the current PC/SC list with the reader name stored by the application.
- Check reader power, USB or remote-session availability, and device events around the first failure.
- Reconnect only after the reader has returned to a usable state; looping on a stale handle will not recover it.
Microsoft: Smart Card Plug and Play
Microsoft: Smart Card Minidrivers
Microsoft: SCardGetStatusChange
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