addrinfo Structure Not Working

This is a discussion on addrinfo Structure Not Working within the Networking/Device Communication forums, part of the General Programming Boards category; I'm trying to learn networking in C++, but whenever I compile this I get a bunch of 'undeclared identifiers' etc. ...

  1. #1
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    addrinfo Structure Not Working

    I'm trying to learn networking in C++, but whenever I compile this I get a bunch of 'undeclared identifiers' etc. If I compile it with <winsock2.h> I get about 86 errors, and when I click on them it takes me to the actual winsock2.h header file. I've included winsock32.lib and wsock32.lib in my linker options too.. Here's what I have so far:

    Code:
    #include <iostream>
    #include <cstdlib>
    #include <windows.h>
    #include <winsock.h>
    
    using std::cout;
    using std::cin;
    using std::endl;
    
    WSADATA wsaData;
    
    int main() {
    	struct addrinfo hints, *servinfo = NULL;
    	int wsaReturnVal = WSAStartup(MAKEWORD(1, 1), &wsaData);
    	if (wsaReturnVal) {
    		cout << "Error number: " << wsaReturnVal << endl;
    		exit(1);
    	}
    	memset(&hints, 0, sizeof(hints));
    	hints.ai_flags = AI_PASSIVE;
    	hints.ai_family = AF_UNSPEC;
    	hints.ai_socktype = SOCK_STREAM;
    
    	int status = getaddrinfo(NULL, "3490", &hints, &servinfo);
    	if (status == -1) {
    		cout << "getaddrinfo error." << endl;
    		exit(1);
    	}
    
    	freeaddrinfo(servinfo);
    
    	if (WSACleanup()) {
    		cout << "Cleanup Error." << endl;
    		exit(1);
    	}
    }
    The errors I get for this compile are:

    Error 1 error C2079: 'hints' uses undefined struct 'main::addrinfo' 13
    Error 2 error C2228: left of '.ai_flags' must have class/struct/union 20
    Error 3 error C2065: 'AI_PASSIVE' : undeclared identifier 20
    Error 4 error C2228: left of '.ai_family' must have class/struct/union 21
    Error 5 error C2228: left of '.ai_socktype' must have class/struct/union 22
    Error 6 error C3861: 'getaddrinfo': identifier not found 24
    Error 7 error C3861: 'freeaddrinfo': identifier not found 30

    Thanks.

    EDIT: Here's a screenshot of winsock2.h errors.. http://img56.imageshack.us/my.php?im...5112335jf3.jpg
    Last edited by pobri19; 10-21-2008 at 08:30 AM.
    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    MSDN says:
    Header Declared in Ws2tcpip.h.
    So there you go.

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    Tried that, didn't work. It gets the same errors as Winsock2.h
    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.

  4. #4
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    Found on msdn:
    The Winsock2.h header file internally includes core elements from the Windows.h header file, so there is not usually an #include line for the Windows.h header file in Winsock applications. If an #include line is needed for the Windows.h header file, this should be preceded with the #define WIN32_LEAN_AND_MEAN macro. For historical reasons, the Windows.h header defaults to including the Winsock.h header file for Windows Sockets 1.1. The declarations in the Winsock.h header file will conflict with the declarations in the Winsock2.h header file required by Windows Sockets 2.0. The WIN32_LEAN_AND_MEAN macro prevents the Winsock.h from being included by the Windows.h header.

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    Alright so just leave out the #include <windows.h> and put #include <winsock2.h> and I should be sweet? I'll try that when I get home and post if it worked. Thanks.
    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.

  6. #6
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    Alright that didn't work, I removed the Windows.h, and tried just using iostream and winsock.h, which produced the same undeclared identifiers errors, so I tried winsock2.h with iostream, which also produced the exact same errors. any ideas?
    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.

  7. #7
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    Add #include <ws2tcpip.h> to your code

  8. #8
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    Alright so now I have:

    Code:
    #include <iostream>
    #include <winsock2.h>
    #include <ws2tcpip.h>
    These are the errors I'm getting...

    Code:
    Error	1	error LNK2001: unresolved external symbol __imp__freeaddrinfo@4	net.obj
    Error	2	error LNK2001: unresolved external symbol __imp__getaddrinfo@16	net.obj
    Error	3	fatal error LNK1120: 2 unresolved externals
    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.

  9. #9
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    Link with WS2_32.lib

  10. #10
    and the Hat of Guessing tabstop's Avatar
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    You are aware that you can search MSDN just as well as the rest of us? If you type in "getaddrinfo" and click on the result and go to the bottom you should see this:
    Library Use Ws2_32.lib.

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