class GPGME::Ctx

def keylist_start(pattern = nil, secret_only = false)

Used by {GPGME::Ctx#each_key}

only secret keys are returned.
+nil+, all available keys are returned. If +secret_only<+ is +true+,
Initiate a key listing operation for given pattern. If +pattern+ is 
def keylist_start(pattern = nil, secret_only = false)
  err = GPGME::gpgme_op_keylist_start(self, pattern, secret_only ? 1 : 0)
  exc = GPGME::error_to_exception(err)
  raise exc if exc
end