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getaddrinfo() problem

Posted on 2004-09-05
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Last Modified: 2007-12-19
Here is my code:

      addrhints.ai_family = AF_INET;
      addrhints.ai_socktype = SOCK_STREAM;
      addrhints.ai_protocol = IPPROTO_TCP;
      pres = 0;
      retVal = getaddrinfo(szHost,"80",&addrhints,&pres);

szHost is equal to "bithub.com".  getaddrinfo() is returning 11003 which is WSANO_RECOVERY.  Does anyone know what I'm doing wrong that is causing the error?
Thanks.
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Question by:lwinkenb
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5 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 11985421
The error code is described as "Nonrecoverable failure in name resolution" (API Ref.: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/winsock/getaddrinfo_2.asp). Have you tried to provide an IP address instead of a host name?
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Author Comment

by:lwinkenb
ID: 11986169
no I havent.  Im using this method to get the ip address.  I usually use gethostbyname(), but in msdn, it says that gethostbyname() is depreciated and to use getaddrinfo() instead.
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Accepted Solution

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aib_42 earned 250 total points
ID: 11986172
Try doing a ZeroMemory(&addrhints, sizeof(addrhints)); before setting up ai_family et cetera.
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LVL 5

Author Comment

by:lwinkenb
ID: 11986233
Clearing the memory made it so the function returned successfully.  Yhanks :)
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LVL 7

Expert Comment

by:aib_42
ID: 11993305
For the record, the problem was that the seemingly-unused fields in the struct contained garbage whereas the MSDN documentation states, quote:

ai_addrlen must be zero or a NULL pointer
ai_canonname must be zero or a NULL pointer
ai_addr must be zero or a NULL pointer
ai_next must be zero or a NULL pointer
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