c++ - Establishing a tcp connection from within a DLL -

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i'm trying write piece of code allow me establish tcp connection within dll file. here's situation: have ruby application needs able send , receive data on socket, can not access native ruby socket methods because of environment in running. can access dll file , run functions within that, figured create wrapper winsock. unfortunately, attempting take piece of code should connect tcp socket in normal c++ application throws slew of lnk2019 errors can not life of me resolve.

this method i'm using connect:

//socket variable socket s;  //establishes connection server int server_connect(char* addr, int port) {      //start winsock     wsadata wsadata;      int error = wsastartup(0x0202, &wsadata);      //check if happened     if (error)         return -1;        //verify winock version     if (wsadata.wversion != 0x0202)     {         //clean , close         wsacleanup();         return -2;     }      //get information needed finalize socket     sockaddr_in target;     target.sin_family = af_inet; //address family internet     target.sin_port = _winsockapi_::htons(port); //port #     target.sin_addr.s_addr = inet_addr(addr);      //create socket     s = socket(af_inet, sock_stream, ipproto_tcp);     if (s == invalid_socket)     {         return -3;     }      //try connecting     if (connect(s, (sockaddr *)&target, sizeof(target)) == socket_error)     {         //failed connect         return -4;     }     else     {         //success         return 1;     } }

the exact errors i'm receiving are:

error   1   error lnk2019: unresolved external symbol _closesocket@4 referenced in function _server_disconnect  [project path] error   2   error lnk2019: unresolved external symbol _connect@12 referenced in function _server_connect    [project path] error   3   error lnk2019: unresolved external symbol _htons@4 referenced in function _server_connect   [project path] error   4   error lnk2019: unresolved external symbol _inet_addr@4 referenced in function _server_connect   [project path] error   5   error lnk2019: unresolved external symbol _socket@12 referenced in function _server_connect [project path] error   6   error lnk2019: unresolved external symbol _wsastartup@8 referenced in function _server_connect  [project path] error   7   error lnk2019: unresolved external symbol _wsacleanup@0 referenced in function _server_connect  [project path] error   8   error lnk1120: 7 unresolved externals   [project path]  1   1

many thanks!

this expected. link project ws2_32.lib on modern windows systems. executable pick dll same name.


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