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

**Holymanus** · 01-03-2011

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;
}

**iMalc** · 01-03-2011

Originally Posted by Holymanus

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.

**Holymanus** · 01-03-2011

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

**tabstop** · 01-03-2011

So you've got to link to the library those functions are defined in. For instance, WSAStartup is in ws2_32.

**Holymanus** · 01-03-2011

you mean with parametr -l Ws2_32.lib ?

**Holymanus** · 01-03-2011

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

**Holymanus** · 01-03-2011

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

**tabstop** · 01-03-2011

You probably just need to do "-lws2_32".

**Holymanus** · 01-03-2011

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

**tabstop** · 01-03-2011

Put the -lws2_32 at the end (I think for the linker it matters).

**Holymanus** · 01-03-2011

right at the end it works
and how to add it to makefile

edit: i have it, simply

Code:

gcc $? -o $@ -lws2_32

**tabstop** · 01-03-2011

Originally Posted by Holymanus

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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