#define INITSOCK if (WSAStartup(0x0202, ...

This is a discussion on #define INITSOCK if (WSAStartup(0x0202, ... within the C Programming forums, part of the General Programming Boards category; Hi im solving problem of function of preprocesor, i dont understand why this cant be linked. Im speaking about funciton ...

  1. #1
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    #define INITSOCK if (WSAStartup(0x0202, ...

    Hi im solving problem of function of preprocesor, i dont understand why this cant be linked. Im speaking about funciton communication because there seems is the problem

    Code:
    #include <string.h>
    #include <sys/types.h>
    #ifdef _WIN32 // _WIN32 is defined by all Windows 32 and 64 bit compilers, but not by others.
    #include <winsock2.h>
    #define WSDATA WSADATA wsaData;
    #define INITSOCK if (WSAStartup(0x0202, &wsaData) == 0) { if (wsaData.wVersion == 0x0202) {
    #define ENDOFSOCK } WSACleanup(); }
    #define DECLARE SOCKET
    #define CON(x) (x != INVALID_SOCKET)
    #define CLOSE(x) closesocket(x);
    #else
    #include <sys/socket.h>
    #include <netinet/in.h>
    #define WSDATA ;
    #define INITSOCK ;
    #define ENDOFSOCK ;
    #define DECLARE int
    #define CON(x) (x >= 0)
    #define CLOSE(x) close(x);
    #endif
    
    typedef struct {
        char messege[255];
        char client_addr[22];
    } udppack;
    
    char messege[255];    //command - msg
    char rcvd_msg[255];   // recieved messege
    char server_address_str[22];
    int max_count_of_rcv = 10;
    struct udppack *pack;
    struct sockaddr_in server_socket_address;
    struct in_addr server_address;
    struct sockaddr_in client_socket_address;
    char *server_addr;
    char *server_port;
    int server_port_int;
    int addrlen;
    WSDATA
    DECLARE client_socket;
    //address
    
    
    int communicate() {
        INITSOCK
        client_socket = socket(AF_INET, SOCK_DGRAM, 0);
        if CON(client_socket) {
            client_socket_address.sin_family = AF_INET;
            client_socket_address.sin_addr.s_addr = INADDR_ANY;
            client_socket_address.sin_port = 0;
    
            if (bind(client_socket, (struct sockaddr*)&client_socket_address,
                sizeof(client_socket_address)) == 0) {
    
                server_addr = strtok(server_address_str,":");
                server_port = strtok(NULL,"");
                server_address.s_addr = inet_addr(server_addr);
                server_port_int = htons((u_short)atoi(server_port));
    
                printf("DatagramType sends to %s:%hu\n",
                    //inet_aton(server_address),
                    ntohs(server_port_int));
    
                addrlen = sizeof(client_socket_address);
                if (getsockname(client_socket, (struct sockaddr*)&client_socket_address,
                    &addrlen) == 0) {
    
                printf("as %s:%hu\n",
                    inet_ntoa(client_socket_address.sin_addr),
                    ntohs(client_socket_address.sin_port));
    
                    server_socket_address.sin_family = AF_INET;
                    server_socket_address.sin_addr = server_address;
                    server_socket_address.sin_port = server_port_int;
                }
            }
        }
        ENDOFSOCK
        return 0;
    }
    Last edited by Holymanus; 01-03-2011 at 12:38 PM.

  2. #2
    Algorithm Dissector iMalc's Avatar
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    Quote Originally Posted by Holymanus View Post
    i dont understand why this cant be linked.
    Do you mean that you have a linker error?
    Perhaps you forgot to add Ws2_32.lib to your link library settings?
    Otherwise please post the linker error, or any other kind of error you get, here.
    My homepage
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  3. #3
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    Code:
    gcc -oSEM.exe tab.o clientapp.o app.o
    clientapp.o:clientapp.c:(.text+0x17): undefined reference to `WSAStartup@8'
    clientapp.o:clientapp.c:(.text+0x2e): undefined reference to `WSACleanup@0'
    clientapp.o:clientapp.c:(.text+0x54): undefined reference to `socket@12'
    clientapp.o:clientapp.c:(.text+0x95): undefined reference to `bind@12'
    clientapp.o:clientapp.c:(.text+0xdb): undefined reference to `inet_addr@4'
    clientapp.o:clientapp.c:(.text+0xf9): undefined reference to `htons@4'
    clientapp.o:clientapp.c:(.text+0x10a): undefined reference to `ntohs@4'
    clientapp.o:clientapp.c:(.text+0x145): undefined reference to `getsockname@12'
    clientapp.o:clientapp.c:(.text+0x15f): undefined reference to `ntohs@4'
    clientapp.o:clientapp.c:(.text+0x16f): undefined reference to `inet_ntoa@4'
    collect2: ld returned 1 exit status
    Build error occurred, build is stopped

  4. #4
    and the Hat of Guessing tabstop's Avatar
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    So you've got to link to the library those functions are defined in. For instance, WSAStartup is in ws2_32.

  5. #5
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    you mean with parametr -l Ws2_32.lib ?

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    Code:
    gcc -LC:\Program Files\Microsoft SDKs\Windows\v6.0A\Lib -oSEM.exe tab.o clientapp.o app.o -lWs2_32.lib
    c:/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../../mingw32/bin/ld.exe: cannot find -lWs2_32.lib
    collect2: ld returned 1 exit status
    Build error occurred, build is stopped

  7. #7
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    And if im trying to add this file with ld.exe

    Code:
    ld.exe "C:\Program Files\Microsoft SDKs\Windows\v6.0A
    \Lib\Ws2_32.lib"
    ld.exe: warning: cannot find entry symbol _mainCRTStartup; defaulting to 00401000

  8. #8
    and the Hat of Guessing tabstop's Avatar
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    You probably just need to do "-lws2_32".

  9. #9
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    same result like before

    Code:
    C:\Users\Martin\Desktop\C\SEM\SEM\SEM 2. verze>gcc -lws2_32 -o clapp clientapp.c
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x17):clientapp.c: undefined reference to `WSASt
    artup@8'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x4d):clientapp.c: undefined reference to `socke
    t@12'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x9b):clientapp.c: undefined reference to `bind@
    12'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0xe5):clientapp.c: undefined reference to `inet_
    addr@4'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x105):clientapp.c: undefined reference to `hton
    s@4'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x120):clientapp.c: undefined reference to `ntoh
    s@4'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x15d):clientapp.c: undefined reference to `gets
    ockname@12'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x173):clientapp.c: undefined reference to `ntoh
    s@4'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x186):clientapp.c: undefined reference to `inet
    _ntoa@4'
    C:\Users\Martin\AppData\Local\Temp/ccIDgaaa.o(.text+0x1c9):clientapp.c: undefined reference to `WSAC
    leanup@0'
    collect2: ld returned 1 exit status

  10. #10
    and the Hat of Guessing tabstop's Avatar
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    Put the -lws2_32 at the end (I think for the linker it matters).

  11. #11
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    right at the end it works
    and how to add it to makefile


    edit: i have it, simply
    Code:
    gcc $? -o $@ -lws2_32
    Last edited by Holymanus; 01-03-2011 at 04:50 PM.

  12. #12
    and the Hat of Guessing tabstop's Avatar
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    Quote Originally Posted by Holymanus View Post
    right at the end it works
    and how to add it to makefile
    If you have a list of libraries, add it in. If you just have a final linking command at the end, put your -l there.

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