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(gpgme.info)Protocol Selection

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Protocol Selection
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 - Function: GpgmeError gpgme_set_protocol (GpgmeCtx CTX,
          GpgmeProtocol PROTO)
     The function `gpgme_set_protocol' sets the protocol used within
     the context CTX to PROTO.  All crypto operations will be performed
     by the crypto engine configured for that protocol.  Note:
     Protocols and Engines.

     Setting the protocol with `gpgme_set_protocol' does not check if
     the crypto engine for that protocol is available and installed
     correctly.  Note: Engine Version Check.

     The function returns `GPGME_No_Error' if the protocol could be set
     successfully, and `GPGME_Invalid_Value' if PROTOCOL is not a valid
     protocol.