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Using condition function in WSAAccept

Posted on 2001-08-21
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Last Modified: 2007-12-19
I tried to use callback condition function in WSAAccept. I wrote the code as what MSDN told me to do. When I use WSAConnect(...) I specified the lpCallerData and left the last three parameters to be NULL. But when I use condition function on the accept side, no caller connection data could be retrieved. The lpCallerData is always NULL. Anything I haven't noticed? Please help me, thanks.
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Question by:xutao
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9 Comments
 
LVL 4

Expert Comment

by:VincentLawlor
ID: 6411639
Have you called WSAStartup ?

Have you called bind on the socket first ?

Vin.
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Author Comment

by:xutao
ID: 6417523
Sure.
In <<Winsock 2.0>> I found that from WSAPROTOCOL_INFO I can get whether a certain protocol support connect data exchange. So I use WSAEnumProtocols(...) to retrieve the info. On my pc I get 12 protocols' info. Then I check "WinSock Proxy [tcp]" protocol, after checking XP1_CONNECT_DATA bit of the dwServiceFlags1(in WSAPROTOCOL_INFO structure) it returns 0. So I think the protocol I use doesn't support connect data exchange. Am I right?
Then I check all the 12 protocols' dwServiceFlags1, all the return value of that bit is 0. Any one ever used connect data exchange in socket programming? Any suggestion?
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Expert Comment

by:VincentLawlor
ID: 6417664
I think you also need to give a pointer to the user data that is to be transferred back from the other socket during connection establishment. i.e.

int  WSAConnect(
  SOCKET s,                          
  const struct sockaddr FAR *name,  
  int namelen,                      
  LPWSABUF lpCallerData,            
  LPWSABUF lpCalleeData,            
  LPQOS lpSQOS,                      
  LPQOS lpGQOS                      
);

lpCalleeData must also be specified.

Vin.
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Author Comment

by:xutao
ID: 6421704
I've tried but it does nothing.
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Expert Comment

by:VincentLawlor
ID: 6422325
So on the connect side you populate a WSABUF structure ?

Vin.
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Expert Comment

by:amp072397
ID: 6789693
xutao:

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thanks!
amp
community support moderator

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Author Comment

by:xutao
ID: 6791636
Sure.
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by:Netminder
ID: 6805772
Note sent today to Admin re: remaining open questions.

Netminder
Community Support Moderator
Experts Exchange
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Netminder earned 0 total points
ID: 6834943
Admin notified of user neglect. Points refunded and question closed.

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