Re: [asio-users] Checking for success with in a TCP client

[Christopher K. <ch...@ko...>]

Simon Pickles wrote:
> So the line:
> 
>      else if (endpoint_iterator != tcp::resolver::iterator())
> 
> isn't true if the server is not available.

Eek, too many negatives! :)

> What exactly does this line do?

It tests whether you have reached the end of the list of endpoints 
returned as a result of the name resolution. In the context of your 
code, it says that you haven't yet exhausted your connection attempts.

>>     else if (endpoint_iterator != tcp::resolver::iterator())
>>     {
>>         g_log->CLIENT("Connection unsuccessful\n");
>>         m_socket.close();
>>         g_log->CLIENT("Retrying\n");
>>         tcp::endpoint endpoint = *endpoint_iterator;
>>         m_socket.async_connect(    endpoint,
>>                                 boost::bind(    &ASIOClient::HandleConnect,
>>                                                 this,
>>                                                 
>> boost::asio::placeholders::error, ++endpoint_iterator));
>>     }
>>
>> }
>>
>>
>> Is seems the error isn't caught by the else.

Try adding an additional else branch:

   else
   {
     g_log->CLIENT("No more endpoints to try, giving up\n");
   }

Cheers,
Chris