从DLL内建立tcp连接

Establishing a tcp connection from within a DLL

本文关键字：tcp 连接 建立 DLL      更新时间：2023-10-16

我正试图编写一段代码，允许我从DLL文件内建立TCP连接。我的情况是这样的:我有一个ruby应用程序，它需要能够通过套接字发送和接收数据，但是由于它运行的环境，我无法访问本机ruby套接字方法。然而，我可以访问DLL文件并在其中运行函数，所以我想我会为winsock创建一个包装器。不幸的是，试图在正常的c++应用程序中使用一段应该连接到TCP套接字的代码会抛出大量的LNK2019错误，这些错误是我一辈子都无法解决的。

这是我用来连接的方法:

//Socket variable
SOCKET s;
//Establishes a connection to the server
int server_connect(char* addr, int port)
{
    //Start up Winsock
    WSADATA wsadata;
    int error = WSAStartup(0x0202, &wsadata);
    //Check if something happened
    if (error)
        return -1;

    //Verify Winock version
    if (wsadata.wVersion != 0x0202)
    {
        //Clean up and close
        WSACleanup();
        return -2;
    }
    //Get the information needed to finalize a 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 the 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 to connect
        return -4;
    }
    else
    {
        //Success
        return 1;
    }
}

我收到的确切错误是:

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

多谢!

这是预期的。将您的项目与现代Windows系统上的Ws2_32.lib链接。您的可执行文件将选择具有相同名称的DLL。

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