How to test winsock apps with bound connect AND listen sockets?

I am tr开发者_开发问答ying to connect two of the same app with winsock, but the connecting side has to use ConnectEx() which requires a bound socket. So the problem is that when I try to loop back using ip 127.0.0.1, I get error 10048(WSAEADDRINUSE).

Is there any way around this problem?

Thanks for any help

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Although ConnectEx() requires a bound socket you don't need to select a port and explicitly bind it you can bind to a wildcard address simply leave the port as 0 and the OS will select one for you as it normally does with outbound connections.

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Make sure your two app instances are configured up to use different ports.

• Instance 1 listens on port X, connects to port Y
• Instance 2 listens on port Y, connects to port X