libxrdeveloper's documentation
gboolean xr_client_call ( xr_client_conn conn,
xr_call call,
GError **  err 
)

Perform XML-RPC call over connection.

Parameters
connConnection object.
callCall object.
errError object.
Returns
Function returns FALSE on failure (including XML-RPC exception) and TRUE on success. XML-RPC exception have err->domain == 0.
Documentation for libxr, Wed Apr 27 2016 22:07:49.